Re: What would cause this piston damage.. twice.

* wormdirt * /
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> Born to be WillD Wrote:

> -------------------------------------------------------

> Lets CSI this shit - piston caught something on the top edge of the

> transfer and it gouged down the side of the piston. twice. all we know

> for sure is that there was (or maybe still is) something in three that

> caught and gouged. is there any shit still wedged in there to indicate

> what it came from?


> size and shape matches pretty closely with a needle, how's the crank

> condition. I had a bigend bearing explode on a ZA once. nightmare

> status. Also circlips - are they all still there?


> circlips and bearings are likeliest to catch on the transfers like that.

> stll anything getting in the cylinder is going to have a chance to catch

> on the transfers. Weld shit can screw you, it's possible to suck shit

> back up from the exhaust but still... not very likely.


> Anthing missing from your carb>? I dropped out a throttle slide

> retaining pin from a clone bing once. never used a clone bing since...

Carb is good to go.

Piston was intact the ring was still on, seized but still there. Circlips were still there. Nothing was in the cylinder the only evidence was the damage.

I'm thought the bottom end bearing went to shit because the con rod was a little chunky after the first cylinder destruction. I put a little pb blaster on it and it was smooth as butter (maybe not the best idea). The exhaust doesn't have anything rattling around. My brother welded a new stinger on it for me because the original was fucked.

The wierd thing is that everything is good to go after I put a new kit on it. I get a few miles out of it, start to tune, look at pipes on treats, then boom, engine peters out and I walk my ass home.

I'm pretty hesitant about cracking the case just because if I'm in there I'm going to do the bearings and seals. I know I can shim the crank but it's going to be a pain in the ass.

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