Author Topic: Help with 340 Invader flywheel nut removal SUCCESS!!!!  (Read 5366 times)

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neworiginal

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Help with 340 Invader flywheel nut removal SUCCESS!!!!
« on: March 26, 2019, 11:59:29 AM »
Hello All,
Attempting to remove my 340 invader flywheel and have already failed at the flywheel nut. It appears a few tabs were in place to stop the nut from moving. I have since pushed these back. However now I cannot seem to get a properly size socket in place. What is the proper socket size? I assume a six sided is best. Also are those 2 brackets suppose to get bent back? Pic attached. Thx.
« Last Edit: March 30, 2019, 12:31:09 PM by neworiginal »
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS

neworiginal

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Re: Help with 340 Invader flywheel nut removal
« Reply #1 on: March 26, 2019, 04:23:59 PM »
Got it, lower profile 15/16 with impact
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS

neworiginal

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Re: Help with 340 Invader flywheel nut removal
« Reply #2 on: March 26, 2019, 05:22:13 PM »
Update, broke bolts on the first flywheel puller.
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS

gixxer6

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Re: Help with 340 Invader flywheel nut removal
« Reply #3 on: March 27, 2019, 11:04:20 AM »
Get some good 12.9 grade bolts.  HUGE difference. 

mswyka

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Re: Help with 340 Invader flywheel nut removal
« Reply #4 on: March 27, 2019, 11:30:25 AM »
I recommend taking the starter cup off first. That gives access for a normal impact socket.

Tom, do you have a source for 12.9? I just bought a a bag of 10.9
Intruders:  1978, 1979, 1981 Custom (Pink)
Invaders:   1980 440
Projects:    1981 Invader 440

neworiginal

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Re: Help with 340 Invader flywheel nut removal
« Reply #5 on: March 27, 2019, 12:13:15 PM »
Thanks, I did remove the starter cup after I got the flywheel nut off. My next question was where to get the better bolts as I just had no luck at Home Depot looking for grade 8 bolts. The 3 bolts that came with the puller stood no chance. The 1/4 28's fine threads I did buy at Home Depot look to have too deep of a thread cut to use.  What is the exact bolt size, I was wrong with the replacements I got which were 1/4 28's
« Last Edit: March 27, 2019, 01:45:26 PM by neworiginal »
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS

rminier

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Re: Help with 340 Invader flywheel nut removal
« Reply #6 on: March 27, 2019, 03:18:19 PM »
 I'm 95% sure that you need 6 mm bolts.
A curious thing about the Kawi sleds...the engines and I believe the clutches were made in Japan, and use metric fasteners. The rest of the sled was made in Lincoln, Nebraska, using good ol' 'Murican SAE fasteners.
 Maybe gixxer6 will post on here with info on the very high grade bolts......I have found that the hex (Allen wrench style) bolts are usually a very high grade compared to regular bolts.....although I don't know what grade they typically are.
Go to a decent Auto Parts store or good hardware and pick up some 6 mm Allen style bolts and give it a try.
 Patience is a virtue when removing a flywheel. I like to put Never-Seize on the bolt threads and the tip of the puller bolt.
Torque it down pretty hard, making sure the puller remains "square" with the world. I don't like to go crazy, but tapping the puller with a hammer helps. Tighten, tap, see if you can tighten a tiny bit more, let sit overnight and try for a little more torque the next day. You will get it.
« Last Edit: March 27, 2019, 03:23:41 PM by rminier »
75 SnoJet Astro SS, 79 Kawasaki Invader 440 (two of them), 81 Scorpion Sidewinder, 82 Blizzard 9500, 83 Yamaha Vmax 540, 97 MXZ 670....and holding...for now.

rminier

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Re: Help with 340 Invader flywheel nut removal
« Reply #7 on: March 27, 2019, 03:41:45 PM »
 A couple more thoughts.....I dug out my puller and a spare flywheel I have.
Once the 3 bolts first begin to thread into the flywheel, it takes 8 full turns to get the threads completely through the flywheel. Go 9 to be safe.
Knowing this will prevent the bolts from going too far where they could ding up one of the coils laying behind the flywheel, and it makes sure the threads are fully engaged so you have less risk of stripping any of the threads.
Whenever you pick up some new bolts for your puller, pick up a few really thick, heavy washers to place beneath the bolt head in case you need them to get this proper spacing.
75 SnoJet Astro SS, 79 Kawasaki Invader 440 (two of them), 81 Scorpion Sidewinder, 82 Blizzard 9500, 83 Yamaha Vmax 540, 97 MXZ 670....and holding...for now.

neworiginal

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Re: Help with 340 Invader flywheel nut removal
« Reply #8 on: March 27, 2019, 05:57:29 PM »
Going to let it sit a bit.
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS

mswyka

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Re: Help with 340 Invader flywheel nut removal
« Reply #9 on: March 27, 2019, 07:24:23 PM »
They are 6mm x 1.0.  For my puller I use bolts that are 60mm long
Intruders:  1978, 1979, 1981 Custom (Pink)
Invaders:   1980 440
Projects:    1981 Invader 440

neworiginal

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Re: Help with 340 Invader flywheel nut removal
« Reply #10 on: March 28, 2019, 11:54:31 AM »
Trying a new puller and bolts. I have to cranked down so hard I'm beginning to think I'm doing this wrong. The flynut is just on a few turns to stop it from flying off and killing me if it ever does give. I cant tighten anymore without spinning the engine off the work bench.Should I give it a shot with the impact or just wait it out?
« Last Edit: March 28, 2019, 12:04:41 PM by neworiginal »
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS

rminier

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Re: Help with 340 Invader flywheel nut removal
« Reply #11 on: March 28, 2019, 01:00:02 PM »
 Here is some more interesting reading from  vintagesleds.com
Couple things caught my eye....definitely don't use too much heat.
And, I have never tried the computer spray that is extremely cold, but that sounds interesting.

https://vintagesleds.com/bs/index.php?topic=50045.0
75 SnoJet Astro SS, 79 Kawasaki Invader 440 (two of them), 81 Scorpion Sidewinder, 82 Blizzard 9500, 83 Yamaha Vmax 540, 97 MXZ 670....and holding...for now.

mswyka

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Re: Help with 340 Invader flywheel nut removal
« Reply #12 on: March 28, 2019, 01:12:18 PM »
A couple more thoughts.....I dug out my puller and a spare flywheel I have.
Once the 3 bolts first begin to thread into the flywheel, it takes 8 full turns to get the threads completely through the flywheel. Go 9 to be safe.
Knowing this will prevent the bolts from going too far where they could ding up one of the coils laying behind the flywheel, and it makes sure the threads are fully engaged so you have less risk of stripping any of the threads.
Whenever you pick up some new bolts for your puller, pick up a few really thick, heavy washers to place beneath the bolt head in case you need them to get this proper spacing.

This is some really good advice.

Now, once the puller is cranked down, just like the drive converter, you can hit the center shaft of the puller with a good hammer.  It has to be a dead-on blow directly in line with the axis of the crankshaft.  I use the short handled lump hammer (fourth from the right in the photo).  Should only take one shot.
Intruders:  1978, 1979, 1981 Custom (Pink)
Invaders:   1980 440
Projects:    1981 Invader 440

kawhead

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Re: Help with 340 Invader flywheel nut removal
« Reply #13 on: March 29, 2019, 10:19:41 AM »
when the puller is tight it must be square with the flywheel so it pulls even

neworiginal

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Re: Help with 340 Invader flywheel nut removal SUCCESS!!!!
« Reply #14 on: March 30, 2019, 12:45:42 PM »
Had some errors trying post a success post with pics but cliff notes are I got it with a wagner heat gun and the staples spray approach. thx all.
1979 Invader 440, 1980 Invader 340, 1985 Yamaha XLV, 1980 Ski-Doo Citation SS