Siezed up crank

Blaster crazy

Member
Dec 17, 2015
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Hey guys was drifting around today in the snow and quad started to bog down it stalled then I kicked it twice and the third time the kick starter was completely siezed got it home took top end off and crank arm is completely siezed what could have caused this
 
Many things.

After seeing the picture of your piston in the other thread,and its groove that you want to "sand down" (seriously?), I would say you have multiple problems. Sounds like this blaster has led a hard life with half ass'ed maintenance.

Time to get serious about the questions your asking. Why waste your time and ours?

When was the engine last torn down, or rebuilt? ...Not including this time.
 
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Now the piston picture makes more sense. Basically the crank wore to the point that it spit a roller or two out of the big end, which got sucked up through the transfer ports into the cylinder.
Bet you have a nice gouge in the cyl matching the piston, maybe pitting in the head?
 
You do know you can't just hold the thing at WOT for very long since it's a 2 stroke and doesn't really have a limit on Rpms other than the crank just physically can't turn any faster, right?
The best way to maintain your quad is to start with not beating the sh*t out of it. You must have really messed it up if you managed to blow a bottom end on a motor that makes a little over 0 ft/lb of torque, or your oil injector failed and you didn't know until now
 
So I'd do a top and bottom end break it in right and then not worry about it. No matter what now that something blew up in it your better off doing the motor over than doing one part at a time. Sorry you bought a beaten blaster idk what to tell you ┐(‘~` )┌
 
Nothing wrong with buying one that needs work.. You just went one doughnut past the failure point.

Hopefully a complete rebuild is in the budget. New crank, bearings, piston, fresh bore, gaskets, crank seals. I also suggest new counter balance shaft bearings and inspect the gear closely.