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Discussion Starter · #1 ·
I was riding my sons '89 kx80 full throttle, top gear.....and the bike died and back tire locked up. Tried to restart (knowing full well that I popped the motor) and nothing...no fire, very little compression. I can kick it over with my hand!! Before I tear into this bike, what should I be looking for? This is my first time with a two-stroke.
 

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If back tire is locked and you can kick it over, either chain is stuck or trans wacked. If you can kick it over in gear with no clutcch, it's the trans. Good luck!
 

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The siezure could be due to several things. Mostley it was the rings that gave up and the bits got caught in the ports.
Without those piston rings you'll have no compression.
As it is easy to take these engine apart, I'd think you'll be able to do so as long as you have a good toolkit and a manual.
I'd reccomend a full stripdown, including the crankcases, to make sure no bit of ring got left behind.
If the bore hasn't been too damaged, you might be able to get away with hone of the bore, or you might have to go for a +0.5 or even a +1mm overbore. Piston kits ain't as costly as some think.
Good luck
Si
( www.dogdragons.com)
 

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Discussion Starter · #4 ·
Thanks for the advice. I have the tools and can get the manual. I'll post what I find once I get the top end apart.
 

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If I remember correctly it will take special tools to split the cases. If you are going to do a full tear-down might want to look into where you can borrow/rent/buy.

It will be a lot of fun and great learning experience for you. 2-strokes are a blast to work on.

:cool:
 

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The onll 3 specialist tools I can think you might need are a torque wrench (mine cost £25... about50 dollars, you'll need that when you put the head back on anyway) and a clutch splitting tool (which you can make yourself... if you've got a haines manual lying around it shows you hot to). you might need a puller for the gerator, those are usualy cheap.
I usauly use a wooden block and a lump hammer to split the ceses themselves.
They can be a bit stiff, when you get a small gap between the cases then spray some penatrating oil where the dowels are and leave it to penetrate for about 12 hrs, it usualy does the job.
If it are bits of broken rings (or worse bits of broken piston)in that crankcase, and you run it without with removing them, it won't be long before the engine goes bang.
If you decide to do it yourself, and you have problems, just ask on the forum, I'm sure someone will help.
Have fun and happy new yr.
SI
P.S. your local engineer should be able to deal with a hone or a re bore, just take the bore and piston rings. Last hone I had done cost £32 per bore. It's a lot cheaper than buying another engine.
 
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