'00 YZ426 engine froze up

Hey, does anyone have any ideas of what could cause my engine to just freeze up. I have an '01 YZ426. The bike was running fine, then it just froze. No preceding strange noises or anything. My buddy filled it with 110 octane racing fuel (unbeknownst to me!). Could this be the cause? Any and all help would be greatly appreciated!

If you can't kick it over with the decompression lever pulled, then it probably is the connecting rod bearing. I just replaced my whole crankshaft assembly because of that very problem. The good thing is that it is relatively easy to do yourself.

i had a motor lock up on me once. their was a chip of metal that got down by the crank and jamed it and nothing would move. then i got it out and it worked good.

I wish my buddies would give me free tanks of 110.....

anyway, if the bike wasn't jetted for the 110 then you we're probably running a wee bit hot and seized it up. Pull the head and see what the cylinder wall looks like.

i had a motor lock up on me once. their was a chip of metal that got down by the crank and jamed it and nothing would move. then i got it out and it worked good.

Was it a bottle cap?

I wish my buddies would give me free tanks of 110.....

anyway, if the bike wasn't jetted for the 110 then you we're probably running a wee bit hot and seized it up. Pull the head and see what the cylinder wall looks like.

Why wold you want to fill up a four-stroke with 110 anyway? It only hurts performance.

(Assuming the compression is stock or close to it).

Hey, thanks for the help. Ended up being the rod bearing. Now, just got to get it put back together, then it's back to the fun.

Was it a bottle cap?

Brilliant :applause: LMAO

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