Broken cam 2017 Sportsman 450 HO
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By BuckBilly
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By exalrod
Hello All !
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By DaveswMN
Pulled my '86 Moto4 out of shed where it sat for 20 years. I knew it smoked. checked it over a little put in gas and it fired right up!!
Drove about 100 yards, ran about half throttle wouldn't idle. Put on somenew parts, jug/piston and rings, carb and valve seals.
'went together ok, tuned it over by hand about 6 revs whick went well. Hit the starter it fired for about 6 revs and quit. tried it again fired once and then th sound of something slipping like maybe chain slipping over spoket.
Took cover off to watch cam sproket, hit starter again, heard same noise and the cam sproket was not turning but jumping a bit. Chain was still tight. You will probably tell me I need to split the lower case but hoping there mightbe something else.
I don't fully understand the chain tightener, the plunger only moves about 1/4 inch, should it move much more than that when off the motor and compressing it by hand?
Thanks for any thoughts.
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By Thebritish
My bayou 250 came to a stop and would not not start, it turned out the starter clutch had a fit and died. I changed the starter clutch which had sheared off the 3 bolts attaching it to the flywheel and everything went smoothly. However, when I went to start it I found it would not start. On investigation I found the timing out of whack, by alot. Thinking it was something I did on the repair, I repeated the process of removing and reinstalling the starter clutch and related components and resetting the engine to TDC. Tried to start and immediately realized the timing was out of sync again.
Is there something I'm missing? Could there have been a bigger issue, possibly on the other side of the engine? I don't understand why, with a brand new starter clutch there would be such movement in the crank. The timing chain and sprockets do not look worn and appears to be tight on the tensioner. When I move by hand everything appears to move as you would expect. But when I try to start it using the starter or the pull start it goes out of whack!
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