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Tech Information => Tips and Tricks => Topic started by: Trucker on October 15, 2012, 04:29:31 PM
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Fastest LTD I have ever rode
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Patrick Kolenko
post Jan 23 2006, 10:29 PM
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Hey Guys! I just got my 81 LTD out that I have been working on for a couple of months.I did a Mikuni conversion running 36mm's with no air box. I still have a little bit of a bog but man when it goes you can't steer because the ski's are in the air. This is the 3rd LTD I have ever owned and up till now they never impressed me. I know that my Invaders would take the other two I owned but I think this LTD is quicker than the Invaders. Now if we just had some more snow??????
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MIDMICHIGAN550
post Jan 24 2006, 12:08 AM
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Congratulations on getting that done. I had the same reaction when I did that to my interceptors. I remember feeling like I had just discovered nuclear fission or something. You will love having a primer, (they now start on the first or second pull most of the time). Those carbs sure do howl dont they? I run a set of 4 inch k-n filters and they fit perfect without any steering shaft problems. I know I picked up a solid ten sled lengths in 600 ft race with the mikuni carb conversion. (power jets). I was able to run a taller gear that helped make a lot of speed at the end of the race where I never had enough hp to do that before the conversion. Not to mention how well the throttle cable pulls now. Now I can pull the carbs in about five minutes if I want to do any maintenence on them not like the job that used to come with the kehiens. Have fun with it, you will love the new found speed.
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Eric Winkworth
post Jan 24 2006, 07:28 AM
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other then eating gas the Kehins work amazing on my LTD starts usally 1st pull, track never stops spinning and when you use the acclerator pumps on the low end no bog what so ever. She'll do 100mph well at least thats what the speedo says, the helmet I wear is a motocross style one with a beek and the first time I did the high speed test it felt as if my head was gonna be ripped off, now I know to keep the beek down.
I am getting some extra 36 mikuni's with the invader i'm getting, I would be very grateful if you shared some jet sizes with me. LOL
I already schooled this invader i'm buying, but it is so cherry I couldn't say no, gotta make room for 1 more sled.
something that just came to mind I never asked, although the grips are hard and not overly grippy at all, do the freaking things ever show any signs of wear? My drifter has more hours on it then most sleds ever see, maybe they are new grips, I dunno.
cheers
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Patrick Kolenko
post Jan 24 2006, 10:17 AM
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Hey Midmichigan550. I have a 550 Interceptor that I am still running Keihins on and it totally rips. I can pull the ski's at 40 mph and the throttle response is excellent. When it runs as good as it does now I just can't see converting it. I bought this sled from the original owner about 6-7 years ago and he has a wall of throphies won with this sled. It was raced from day one and only had 600 miles on it when I bought it. Now it had about 1500 on it and have never had a problem except for snapping the driveshaft in two and have broke a few belts. I am running a 1 1/2" paddle track on it and the skis are in the air more than they are on the ground!!!!!! I also live in Michigan and it sure would be nice to get some snow!!!!!
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Alex
post Jan 24 2006, 10:47 AM
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We need snow here in north Ia.too.I called the hotel at Waconia and she said there is snow in the ditches-but if it's like what we have it's like half cured cement. Just got done putting 2 new pistons in my 550,be nice to have some good snow to break it in.i think I'll try the mikuni deal too,carbs probably caused the piston problem-hate to buy 2 more. dry.gif
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Boomologist
post Jan 24 2006, 11:28 AM
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QUOTE (Patrick Kolenko @ Jan 24 2006, 07:17 AM)
I am running a 1 1/2" paddle track on it and the skis are in the air more than they are on the ground!!!!!!
Before I got my first Interceptor I had read that they would pull the skis for incredibly long distances. I thought it was more hype than anything, until I got my first. It, too, had been on the race circuit (grass drags mainly) and had never lost a race in it's class.
The first time I snapped the throttle the skis came way up and my eyes were the size of dinner platters. Wasn't expecting that. It's fun to be riding with friends and fly past them with skis in the air. And yes, they will pull the skis at 40!
Both my Interceptors have Mikuni 38's with no power jet and a brass screen shaped like a K&N filter clamped to each carb.
God I wish we had some snow here! Perhaps to the mountains this week.......
--------------------
Thanks,
Ron
Ski tips touching the water, hand on the throttle, engine revving, the smell of two stroke exhaust, looking 1/4 mile across at the shore on the other side. Thought going through his mind "what the hell am I doing"! Then the instant explosion of noise, adrenalin, water spray.......
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MIDMICHIGAN550
post Jan 24 2006, 12:11 PM
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Mr. Kolenko I never said you had to convert to mikuni carbs. If you are happy with the way the sled runs and it is doing fine I would not change it either. Mine was fast too. Problem is its not 1982 anymore and I am not racing polaris centurions or 9500 blizzards or arctic cat eltigres so the trophys are a little harder to come by with todays competition. My motivation came from racing against sleds that now have 125-150 hp like formula three ski doo's, mach z's, zrt 600's and 800's, firecats,polaris ultra's, xcrs, 600-700-800 xc's, yamaha 700 srx's. You get the idea. When I go to the lake people are not bringing out 440 and 500 stuff out anymore and unless you want to look foolish you have to try different things to stay in the hunt and the victories come few and farther between. If all those sleds I listed above were racing back in 1982 I guarantee your sleds former owner would not have all the trophies he bagged back then. I know the kawi is a fast sled and was a rocket in its day but the competition is extreme. I race in a group of hardcore drag racers and they are not there to loose. I just give some info on the board but you don't have to take it to heart. Keep the sled mint and original. I like that too. Just keep the kawis going because it is always cool to see one out there kicking butt. Later.
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Boomologist
post Jan 24 2006, 01:05 PM
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Any more thought about a blower/turbo system on a piston ported engine? To add a few pounds of boost to the intake would greatly increase power but I don't know if it would work with these engines.
--------------------
Thanks,
Ron
Ski tips touching the water, hand on the throttle, engine revving, the smell of two stroke exhaust, looking 1/4 mile across at the shore on the other side. Thought going through his mind "what the hell am I doing"! Then the instant explosion of noise, adrenalin, water spray.......
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Patrick Kolenko
post Jan 24 2006, 03:24 PM
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Hey Mid Michigan! I really appreciate the info about the throttle cable for the Indy 500. That is the main reason why I haven't converted other 550's I have had. I also have a few 440's out of LTD'S that I had thought about installing in an Invader or building a 550 Invader. Now that I know there is a cable out there that makes running Mikunis possible this may be a project for next fall?????
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Eric Winkworth
post Jan 24 2006, 05:57 PM
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I am getting some extra 36 mikuni's with the invader i'm getting, I would be very grateful if you shared some jet sizes with me. LOL
you obviously don't have too, just asking, well beggin you!!
PLEASE!
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Boomologist
post Feb 7 2006, 12:42 PM
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QUOTE (Patrick Kolenko @ Jan 23 2006, 07:29 PM)
Hey Guys! I just got my 81 LTD out that I have been working on for a couple of months.I did a Mikuni conversion running 36mm's with no air box.
Hi Pat,
In a nutshell could you describe what the conversion took.
--------------------
Thanks,
Ron
Ski tips touching the water, hand on the throttle, engine revving, the smell of two stroke exhaust, looking 1/4 mile across at the shore on the other side. Thought going through his mind "what the hell am I doing"! Then the instant explosion of noise, adrenalin, water spray.......
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maxi426
post Feb 7 2006, 03:21 PM
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Could you please include better info on the throttle cable? Exact application, or a part number. I've looked in High Perf., and Dennic Kirk, and there doesn't seem to be one clear listing for a 500 Indy. Rob
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sdog53502
post Feb 7 2006, 03:33 PM
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I checked out Dennis Kirk today and the picture they had for the 89 500 Indy was just the throttle cables without the oil injection cable....
HELP !! sad.gif
Could it have been from a different year Indy or was the picture wrong ??
Thanks, Steve
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maxi426
post Feb 7 2006, 05:19 PM
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MIDMICHAGIN..... Are you out there? Help us pleeeeease.
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maxi426
post Feb 7 2006, 05:22 PM
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MICHIGAN. Sorry.
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MIDMICHIGAN550
post Feb 8 2006, 12:41 PM
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I know what a pain in the rear those parts catalogs are. I went through the same thing when I was trying to figure out the cable. It has been a long time since I have ordered the cables but I looked it up and it would be the 89-93 Indy 500/ classic, cable part number 19-403 for $20.95 . That should be the one. I see now they don't sell the throttle lever for the mikunis but JR. Graham does but they were out of stock. Maybe ALS in Vermont has one or grab one off a junk 440 invader. They are only $2.00 dollars and dont use one for a polaris or arctic cat because they look stupid on the kawi. They are bigger. Dennis kirk has the choke cables too part no. 19-29 for $11.95. They also have carb flanges for a 440 invader. If you are using 36-38 carbs order part no. 18-68 and they are $8.95 each. There is a nice set of 36mm mikunis on ebay right now that are bored to 37.5mm under ski-doo blizzard. Dennis kirk has the primer kit too part no. 18-62 for $14.99. That should do most of it. If the throttle cable ends have a little trouble going through the holes on the kawi slides dont drill out the slides. I think the polaris slides have a little bigger hole in them. You will see what I mean. Just carefully grind a little off the end of the little ferrell that goes through the end of the slide and locks in place. It only takes about a minute to carefully do it. Just enough to make them fit but not too much. Good luck, it will work like a factory set up. Later
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maxi426
post Feb 8 2006, 12:47 PM
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Great info. Thanx a ton. Would be great to pin this in the tech info section. Rob
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Boomologist
post Feb 19 2006, 02:51 PM
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Found a cheap fix for the cable replacement when putting VM36/38 on LTD (Interceptor too).
Using the standard Invader cable setup I just cut the end off the oil pump cable and inserted a standard cable stop, like the stops used on a manual automobile choke. Just slide it up the cable and lock it in place.
--------------------
Thanks,
Ron
Ski tips touching the water, hand on the throttle, engine revving, the smell of two stroke exhaust, looking 1/4 mile across at the shore on the other side. Thought going through his mind "what the hell am I doing"! Then the instant explosion of noise, adrenalin, water spray.......
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Trucker
post Feb 19 2006, 02:59 PM
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That is what they did on my interceptor when it was converted to minkuni carbs, i looked at the part numbers on the cable and it was an invader cable setup.
--------------------
Jason 320-260-1684
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Kamasaki 550
post Feb 21 2006, 02:15 AM
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Same here, an Invader set-up on the Interceptor! The only bad thing is they didn't hook up the oil injector! Oh well that's an easy fix!
--------------------
RIDE LIKE THERE'S, NO TOMORROW!
VICTOR "KAMASAKI 550"
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Boomologist
post Mar 10 2006, 08:22 PM
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Finally got an EGT installed on the LTD with the VM36 power jet carbs. Took it around the property and WOW does it ever have great acceleration from a standing start! The EGT never went above 800, although I can't keep it wide open for very long. Too many barbed wire fences.
I plan to take it to a neighbors in the morning where I can open it up for much longer distances. If it works like it should I may even convert the Interceptors.
--------------------
Thanks,
Ron
Ski tips touching the water, hand on the throttle, engine revving, the smell of two stroke exhaust, looking 1/4 mile across at the shore on the other side. Thought going through his mind "what the hell am I doing"! Then the instant explosion of noise, adrenalin, water spray.......
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Boomologist
post Mar 11 2006, 10:44 PM
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Update,
Got the LTD to the neighbors for some slushmobiling. That thing screams! I believe it may keep up with an Interceptor. On dirt I believe it would come over on it's back. That much power off the line is a waste without a paddle track.
Good call on those VM36 power jet's on an LTD.
--------------------
Thanks,
Ron
Ski tips touching the water, hand on the throttle, engine revving, the smell of two stroke exhaust, looking 1/4 mile across at the shore on the other side. Thought going through his mind "what the hell am I doing"! Then the instant explosion of noise, adrenalin, water spray.......
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KAWI LTD 440
post Sep 21 2007, 09:06 PM
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For those looking for a cheap , easy way to Supercharge their engines , you might want to check this out.
Link
Duhnis
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kawhead
post Jan 29 2008, 04:32 PM
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i just finished a carb conversion on a 82 ltd, after some re jetting ended up with stock 440 invader carbs, jetting, throttle and choke cables.after 40 km or so,beat on it some, runs strong,starts nicer than stock carbs imo.it hasnt been under 15 degrees,so a little concerned about to lean, but with 140 power jets it was way to fat so 120s should be ok. tom
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Duhnis
post Mar 16 2009, 07:06 PM
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Hi,
I bought 38 flat slides from AAEN , responsive, But really hard on gas. - stock LTD chassis.
I ran 39.5's on the ltd 440 engine, with polaris clutches and a huge gain was had with better fuel mileage.
I later ported & polished the cylinders and cut the head for more comp, when it was in the '79 polaris TXL with middlesex pipes and never had any issues. Putting the engine in a '76 Merc Sno- Twister, biggest gain yet, ran Black Magic Z440 pipes. Made a set of wild pipes out of the stock exhaust with 17mm id stingers.
I haven't tried them and I may have to go to 19mm id.
Later I purchased 44's, but end up taking the engine out of the sled.
I haven't had the time to put it back or work on the polaris powered invader this year either.
The round slides work well, Has anyone tried the mikuni rack syle off a newer polaris?
Duhnis
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dooman
post Nov 13 2009, 10:35 AM
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QUOTE (Duhnis @ Mar 16 2009, 07:06 PM) *
Hi,
I bought 38 flat slides from AAEN , responsive, But really hard on gas. - stock LTD chassis.
I ran 39.5's on the ltd 440 engine, with polaris clutches and a huge gain was had with better fuel mileage.
I later ported & polished the cylinders and cut the head for more comp, when it was in the '79 polaris TXL with middlesex pipes and never had any issues. Putting the engine in a '76 Merc Sno- Twister, biggest gain yet, ran Black Magic Z440 pipes. Made a set of wild pipes out of the stock exhaust with 17mm id stingers.
I haven't tried them and I may have to go to 19mm id.
Later I purchased 44's, but end up taking the engine out of the sled.
I haven't had the time to put it back or work on the polaris powered invader this year either.
The round slides work well, Has anyone tried the mikuni rack syle off a newer polaris?
Duhnis
taper bore a set of 38's and they will flow air like 44's and have better throttle response.
This post has been edited by dooman: Nov 13 2009, 10:35 AM
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ultramotorsports
post Feb 14 2010, 12:22 AM
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anyone still hav any of the keihen carbs they took off?ive got a 81 ltd i just bought with 685 original miles on it,one jet was broke in the bowl from someone overtightening it i tried a set of 122 jets way too big, they were the only ones i had and no dealer stocks 98 main jets for the carbs,i too would love to do the swap but with the low miles dont want to change it around,need some parts for it, shame for it,nice having the electric start
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Duhnis
post Mar 11 2010, 11:15 PM
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QUOTE (ultramotorsports @ Feb 14 2010, 12:22 AM) *
anyone still hav any of the keihen carbs they took off?ive got a 81 ltd i just bought with 685 original miles on it,one jet was broke in the bowl from someone overtightening it i tried a set of 122 jets way too big, they were the only ones i had and no dealer stocks 98 main jets for the carbs,i too would love to do the swap but with the low miles dont want to change it around,need some parts for it, shame for it,nice having the electric start
I have a good set (they were when taken off) and a set that I bought to have as spares (unknown condition)
for when I ran these on the intruder.
I don't have any need for them. Trade for??
Duhnis
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Robby
post Jun 9 2010, 08:20 PM
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i see you got a ltd .do you need a batt to run the light on it .your want do i look for to fix it .yes my is fast too and love it .it makes me smile when i ride it rolleyes.gif
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Yotadieselboy
post Feb 3 2011, 01:46 PM
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QUOTE (Boomologist @ Feb 19 2006, 02:51 PM) *
Found a cheap fix for the cable replacement when putting VM36/38 on LTD (Interceptor too).
Using the standard Invader cable setup I just cut the end off the oil pump cable and inserted a standard cable stop, like the stops used on a manual automobile choke. Just slide it up the cable and lock it in place.
Where would I find this standard cable stop?
Last piece of the puzzle!
-
I started buying stuff to do the conversion on my LTD last year.
I have a pair of 38mm mikuni' round slides but they were given to me from a box of parts a buddy of mine had from a deal he got on a blizzard... I can't figure out what they are off of and have many features I don't think I need and kind of just confuse the mod like a lower jet in the bowl, coolent heating and various other features like what looks to be some kind of electronic idle control... All of this make me hesitant to use them...
So long story long I would like to get some simple ones so I can get this show on the road...
Are these what I want?
From what i've seen most people are asking this much for carbs that look like they've been in a swamp for 10 years, I know carbs clean up and last really well, but 100 bucks for brand new ones sounds darn good... A reviewer mentions a fuel retaining cup he said you need to buy seperate, to keep the needle jet seated properly when using differnt jets, does anyone know if I will need that?
http://www.amazon.com/Mikuni-Round-Slide-Series-Carburetor/dp/B000GZM6X8/ref=sr_1_1?s=automotive&ie=UTF8&qid=1351912988&sr=1-1&keywords=38mm+round+slide
Trucker posted the jet sizes in the other forum, I have uni filters
280 mains
I have the pilots too but can't recall the number...
Thanks for any input! I appreciate any help getting this going!
-
I have a line on some flat slides 38mm mikuni's would they jet the same as the round slides?
Any jetting advice from the gurus?
-
Not only will you have to figure out jet size for the flat side carbs, but also add in the air pods which let more air in. Also it will depend on your particular elevation as air pressure does add into the mix.
There is some debate as to if the 38's are too large. I have heard of people boring out 36's to 37.5 with good success. The manuals all list jets for the 36mm round carbs.
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I may stick with 36's then Jim...
This is something I will be buying, so anything is possible, tell me what you would do? A friend of mine suggested flat slides because he said they're easier to tune... That being said I have no experience with them. I have cleaned and tuned my share of mikuni round slides, but never really swapping jet sizes/carbs just putting things back to run like stock!
My kliehns run fine on the LTD, but I prefer mikunis anyway and I keep reading on how much they wake the motor up, I just can resist changing it!
I think trucker suggested 38's with 280 mains and 90 pilot? That could be off as it's just from memory!
Unless someone chimes in that has done this conversion I may just use stock invader carbs or 4/6... Could someone post up that info if they have it?
I am in no huge rush, because I just spent money on other sled goodies, just doing R&D and any posts are welcome!
Cheers
-
The LTD is a 440 sucking the same amount of air as any other 440. The 4/6 carb settings may be a good joice since it is a little richer than the Invader jetting.
-
Any idea of the setting on a 4/6? and/or a source for a set of 4/6 carbs
Thanks for the reply!
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The LTD is a 440 sucking the same amount of air as any other 440. The 4/6 carb settings may be a good joice since it is a little richer than the Invader jetting.
I disagree with this. All 440's won't suck the same amount of air. Engines with larger ports, or more ports, flow more air. More air requires more fuel. This is why you must increase jet sizes when port work is done. The 81-82 LTD's have 8 port motors which will flow more air then the 4/6 or Invader engines.
I would suggest finding a set of standard Invader carbs, look up the 4/6 jetting specs, then add a few jet sizes. Use that as a starting point. ALWAYS start rich, then slowly decrease the jetting.
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I have a 82 ltd that I have just pulled the keihin carbs apart on, has anyone found carb kits for these or am I going to have to do the carb swap? Also has anyone who has done the carb swap ever try 34mm mikuni's? I have seen newer sleds with larger cc motors running on twin 34's and wonder how they would work on an ltd.
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There is a train of thought about using a smaller size carb to make the air swirl more as it enters making for a better atomization of fuel.
My theory is that Kawasaki has(had) a lot more guys figuring how to make these sleds go fast but still make them reliable so it wouldn't make much sense to change things. I have heard of people spending a bunch of money changing things only to find that it didn't make much of an improvement. The carb change is mostly because of parts availability and the increase in speed was a result.
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I do know it has been done by trucker and others, he did give me some fairly large jet sizes... I'm in no rush and and i'd rather not tinker with it all winter, I have enough projects on the go! I'm sure the information will come up soon... I hope!
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Trucker could you share what kind of setup you ended up with?
I have acquired a pair of 38mm roundslides from a buddy, that are liquid heated although I am not going to worry about figuring that out until I get them running spot on...
I so far have also purchased, 2 uni filters, 2 invader carb boot/flanges, and invader throttle cable... So all I need is an invader throttle lever and a cable stop for the injection...
And some chatting with someone on Jet sizes!
Thanks for any more help and thank you for all the responses thus far...
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I ended up with 35 pilots,260 main jets 2.5 slides Q-0 needle jet and 6dh7 needle
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So does she run like crazy?
Do those slides have 2.5 stamped in them? I see mine say 3.0...
I have 280 mains and 40 pilots on the bench I was planning to use...
The carbs I got were off a 89 570 yamaha exciter and the powerjets were blocked off which I will leave em like that
The needle reads 6FL68
and
The needle Jet 480 P-6
I am not very knowledgeable with carbs, would your recommend I get the 2.5 slides, and different needle and needle jet?
You running filters? Put many miles on ur setup?
Really appreciate that info man and any other info ur willing to share!
Cheers
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I ran it with 280s and k& n filters for awhile then changed to 260s with the stock airbox. i found the 2.5 slides worked best for me and the needle and needle jet is what i found to run the way i wanted it to. I put alot of miles on it like that and ran great. The sled is now near Winnipeg somewhere.
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Thanks again man!
Is that setup with the needle clip in the middle?
Cheers
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I think so but cant remember for sure
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Did you find it to run better with the airbox? I'm just concerned with the airbox not fitting into the space with the mikuni's, did you have any issues with that?
Any chance you know someone with an invader throttle lever?
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wish there was more info on jetting a 4/6 with 38 mik slides