KawasakiTrax Community
Racing Kawasaki snowmobiles past and present => Kawasaki snowmobile racing, stock to full mod => Topic started by: Kal k on February 15, 2017, 08:43:46 AM
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Hi, I just bought a 79 invader and am planning on taking it to some drags. As of right now I got the motor out and going through it plus doing all the seals. Gonna start by making sure it's running good. I'm planning on putting a 102c comet clutch on it and was wondering what spring and weights a guy should get to make it engage in that 4500 - 5000 rpm rang and rev out at 7900 - 8000 rpm. I know this stuff takes lots of trial and error to get it perfect but was hopping someone could point me in the right direction. Thanks
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This is the recommendation's from Comet for a Deere Liquifire. Very similar engine.
http://www.hoffcocomet.com/EpiphanyWeb/FlexPage.aspx?ID=122
Use the Liquifire 436. B1 weights are hard to find. N weights will work.
This page has lots of info on the comet clutch.
http://www.hoffcocomet.com/EpiphanyWeb/FlexPage.aspx?ID=118
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Hi, I just bought a 79 invader and am planning on taking it to some drags. As of right now I got the motor out and going through it plus doing all the seals. Gonna start by making sure it's running good. I'm planning on putting a 102c comet clutch on it and was wondering what spring and weights a guy should get to make it engage in that 4500 - 5000 rpm rang and rev out at 7900 - 8000 rpm. I know this stuff takes lots of trial and error to get it perfect but was hopping someone could point me in the right direction. Thanks
Welcome to the site!! I moved this to the racing thread in the hope that after some time it will be the go to place for Kawi racing info. Good Luck!!
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Thanks for the welcoming. This sight has been a big help so far and thanks for the advice
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Here is a list that includes many Kawasaki sleds
http://www.hiperf.com/acatalog/cometcalguide.pdf
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I have little experience with comet clutched, but I have a good drag setup for the stock Kawasaki clutch that will get you what you are looking for.
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The sled came with a power block clutch on it so if I'm gonna switch it sounds like the 102c is the way to go if I'm spending the money. But I would still like two know what you setup is. And dos anyone know what springs work in the 102c clutches other then comet springs?
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Most of the Kawasaki's, including the Invader, use a rather unique negative offset of -0.200 inches in the drive clutch where the 30 mm taper begins to mount on the crankshaft.
Comet makes one for these sleds...model # 208306 with that exact offset.
The vast majority of clutches are "flush mounted"....millions of sleds are that way.
That means if you get a clutch with the common flush mount, it will sit 0.200 inches closer to the engine when installed....nearly 1/4 inch!
It will fit but I'm not sure you can move the secondary clutch in towards the center of the sled and maintain proper clutch alignment.
Maybe someone on here has used a flush mount Comet and can comment how it worked.
I think the Polaris P-85 drive clutch springs work in the Comet, too....but I'm not positive.
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I'm sure gixxer6 could help with the stock clutching if you want to go that direction.
Here's one on Facebook...stock clutches engaging at 5600... 8)
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The 1980 John Deere Liquifire came with a 102C from the factory. As Llyod mentioned, they have almost identical engines so the stock liquifire calibration should be really close, so a good used Liquifire clutch should be a good starting point.
I might have an extra Invader/Liquifire 102C if you are in the market?
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Ok thanks and I already picked one up. Thanks for the offer
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Gixxer6. I'm curious to know what you did with the gearing or did you just leave it the same
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Stock gearing and stock secondary. I modified a set of E ramps to Aaen spec, and used a red Kawasaki spring. Then adjusted the ramp weights until I got the desired max RPM, being the rest of the sled is stock-ish, 8,000 RPM. I believe for me I ended up with stock ramp bolts with 3 thick washers on each. This gave me a wicked launch, I don't recall the exact engagement rpm, but it made my Invader scary fast. It's an excellent drag setup, but not very trail friendly. I played with the clutch a lot, and ended up with stock. I do keep a clutch setup with the Aaen weights in case I ever get someone that wants to race all I have to do is pop it on.
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Ok I'll have to give it a try. I'm having problems with it having a bit of a bog right now coming out of the hole. So gotta get that figered out. I changed the main jets to 135s because I thought it was to fat. I'm wondering if that hurt it more than. Anything
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So how many grams of weight would the e ramps be with the washers in them about?
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I don't know the exact weight. Start with the stock bolt with three thick washers on each and adjust until it will pull 7900 to 8000 max rpm.
These sleds didn't bog when new. Get it running 100% correct in stock from before modifying. Otherwise it's just a bandaid that will mask the true issue and it will never perform as well as it could. That being said, these old high performance piston port 440s are definitely lacking low end power and if you want to race it, this clutch setup makes a huge difference.
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Ya putting it to sock now to get it figered. Jetted the mains down to 135 because I thought it was to fat but now I'm thinking it's not getting enough fuel through them in bottom end because once the econo jets kick in it pulls hard
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Do you have the original airbox installed?
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Ya but has some cracks in places
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Stock gearing and stock secondary. I modified a set of E ramps to Aaen spec, and used a red Kawasaki spring. Then adjusted the ramp weights until I got the desired max RPM, being the rest of the sled is stock-ish, 8,000 RPM. I believe for me I ended up with stock ramp bolts with 3 thick washers on each. This gave me a wicked launch, I don't recall the exact engagement rpm, but it made my Invader scary fast. It's an excellent drag setup, but not very trail friendly. I played with the clutch a lot, and ended up with stock. I do keep a clutch setup with the Aaen weights in case I ever get someone that wants to race all I have to do is pop it on.
I just started putting my motor back together after replacing pistons and crank seals. I am thinking of setting my 440 Invader up for drags and trails ( two separate clutches). Where can I find the Springs and ramps referenced?
Thank you!
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Fitz2180 what I learned is to have 2 sleds one for trail riding & the other for drag racing clutching is just one part of the set up, ice picks, chisels, r track, light weight skis, drag suspension, open stingers to name a few don't work on trail riding