Piston is destroyed

Jre720 · Mar 19, 2017

so the 98 piston blew up and I knew it was going to happen...it had a bad base gasket so I opened up the top end to do gaskets and the piston was pretty burnt on the top but had no scores in it , the bottom ring was slightly bent and the cylinder had a score so I got it Honed out and told him u might be able to get away with this piston and putting new rings and gaskets but that isn't a good idea...we decided to try it against my better judgment and after about 20 mins of riding it died out , next day rode for 3 mins and he said the top end blew

I had a strong feeling it would

So my question at the end of that story is do you guys think this is a burn or that the piston broke and is inside my crank

Blaaster · Mar 19, 2017

If the piston had been overheated previously it may have have been weak around the ring area.

Fitting new rings and with a fresh hone the sideways pressure of the ring may have been too great for the piston to handle.

The bit of piston is possibly in the exhaust pipe.

blasterboy91 · Mar 19, 2017

Blaaster said:
The bit of piston is possibly in the exhaust pipe.

X2. It's a big piece, not a bunch of little pieces. Pop off the exhaust and see what comes out.

Jre720 · Mar 19, 2017

I will check that out, luckily it didn't score the cylinder again and I ordered the top end kit already I highly doubt it is in the crank I'll have to look thru the whole exhaust pipe tomorow and check back in

Jre720 · Mar 19, 2017

Scratch that it was in the exhaust just shook it out thanks guys

speedyslyder · Mar 19, 2017

just my opinion........
but i have never had a piston break on me
and if that was my piston i would have the cylinder bored/and fitted to a new piston,rings

what is the bore on that cylinder? stock measure it somehow

what size piston did you order?
did you ever get a compression test on it after the new rings?
not that compression is the problem here lol

Jre720 · Mar 19, 2017

speedyslyder said:
just my opinion........
but i have never had a piston break on me
and if that was my piston i would have the cylinder bored/and fitted to a new piston,rings
what is the bore on that cylinder? stock measure it somehow
what size piston did you order?
did you ever get a compression test on it after the new rings?
not that compression is the problem here lol

Never did a test and it is still standard bore and I ordered the standard piston size from wiseco if it was mine I would consider boring but it isn't so I'm gona stick to the basics lol

best · Mar 19, 2017

You got VERY lucky if it didn't scratch the bore or damage the exhaust port or end up with pieces in the bottom end. It is a good time to buy lotto tickets!

Jre720 · Mar 20, 2017

I drained the oil and no metal came out, and I found the whole piece of the piston that broke off in my exhaust so I don't think my crank has any metal in it and as for the cylinder there is no scratches

joeak47 · Mar 20, 2017

Its a two stroke engine. The oil you drained is for the transmission, not the engine. This wouldn't tell you if you had metal in your engine.

Jre720 · Mar 20, 2017

Yes but if metal went down into the crank from the top end wouldn't that be in the gear oil? I'm pretty confident that the crank is still in tact I would at least love to believe it lol

B-1 · Mar 20, 2017

No, the crank is separate from the transmission. If it was a 4 stroke metal would be in the oil not a 2 stroke

Jre720 · Mar 20, 2017

Good to know ..speaking of transmission..any ways of getting inner clutch basket off without a clutch holder? Need to do crank seal on that side along with clutch

Markblaster · Mar 21, 2017

Tool is cheap on ebay just buy one. Makes removing and installing easy. Or make one.
http://www.blasterforum.com/threads/clutch-holder-dxf-pattern.65763/

MURPH · Mar 21, 2017

Markblaster said:
Tool is cheap on ebay just buy one. Makes removing and installing easy. Or make one.
http://www.blasterforum.com/threads/clutch-holder-dxf-pattern.65763/

Ya it does make it a lot easier. ..also the tusk one is a flywheel holder too so it has dual purposes ..

DUALSTROKE · Mar 21, 2017

Not to be an arse but this has fail written all over it. Did you put a bore gauge down the cylinder to see where you are at? I have a hard time believing that the cylinder is still on stock bore and you keep honing it. I can imagine a bit of piston slap if not worse. You will never find much from that piston in the lower end. You will find fragments in the crank bearings though. Time to actually take some measurements, split the cases to check run out on crank and to check bearings and go from there. Its just a ticking time bomb without using measuring equipment.

Jre720 · Mar 21, 2017

I only
Have had it honed out once I used a micrometer and it was still at 66 mm I am debating splitting the case but at the end of the day it isn't my call it's not my bike I am just helping as much as I can

Jre720 · Mar 22, 2017

MURPH said:
Ya it does make it a lot easier. ..also the tusk one is a flywheel holder too so it has dual purposes ..

This one right ?

MURPH · Mar 22, 2017

https://www.google.com/imgres?imgur...uvSAhUE2WMKHUAFD40QMwgzKAEwAQ&iact=mrc&uact=8

Markblaster · Mar 23, 2017

http://www.ebay.com/itm/EBC-Clutch-...ash=item2ee855a44b:g:WNAAAOSwT4lWRWZS&vxp=mtr

Piston is destroyed

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