Locked-up

[67rsss]

Started the zilla and didn't check the fuel, with-in a minute it dies. Put fuel in it and the piston is stuck down at the bottom of the stroke. The piston moves up and down slightly when you rock the quad in gear, but you can't get it to come completely up.

Any idea what could have happened, would like to get an idea before we open it up and look.

[burgiebird]

The rings might have folded. Just a guess.

[trx]

If The Top Of The Piston Is Black Its Fried IF It Moves A Little Then Its The Rings Can You Kick It Over With The Kicker

[kennerz]

Sounds like a cold seizure, did you let it warm up first? From my experience the LT500 is cold blooded, and especially if you had a weisco piston in there, they will tend to expand faster than the cylender when cold and put under a load too fast.

(aka hop on and ride fast as soon as you start it - big no-no)

[burgiebird]

You might have sucked a reed. You might have a piece or the reed stuck between the piston and cylinder. Pull the reed cage and look. you need to pull the jug anyway.

[morph0906]

Sounds Like The Rings

[67rsss]

Pulled it apart last night and part of the bottom of the piston broke off and fell into the crank case. A piece of the aluminum wedged itself between the case and crank. Lucky it was at idle when it happened. Everything else looks great, guess I'll clean it out and throw a new piston and rings in it.

Thanks for everyone's input!!

What usually causes a piston to break on the bottom?!?

[burgiebird]

Wow Bro, That could have been real bad. Im glad you didnt gernade the bottom end. Hey and excuse for a fresh piston. Why not.

[blaster911]

Originally Posted by 67rsss

Pulled it apart last night and part of the bottom of the piston broke off and fell into the crank case. A piece of the aluminum wedged itself between the case and crank. Lucky it was at idle when it happened. Everything else looks great, guess I'll clean it out and throw a new piston and rings in it.

Thanks for everyone's input!!

What usually causes a piston to break on the bottom?!?

same thing happened to my blaster a week ago except i was going balls out racing a lil cr 85 full throttle

[Apher]

Originally Posted by 67rsss

Pulled it apart last night and part of the bottom of the piston broke off and fell into the crank case. A piece of the aluminum wedged itself between the case and crank. Lucky it was at idle when it happened. Everything else looks great, guess I'll clean it out and throw a new piston and rings in it.

Thanks for everyone's input!!

What usually causes a piston to break on the bottom?!?

It could be a fluk piston problem.
But
I would check your bore size and the piston size. To much slop in between can cause the piston skirt to slap the side of the cyinder wall and break it off. As stated above make sure it is warmed up. High revs on a cold motor can cause piston slape also. That big of a piston will expand alot when it is warmed up.

Just my .02, Apher