Piston pisser! Suzuki GP100

[cb1rocket]

ok guys. After getting my GP100 on the road, not to mentioned the consent engine problems and getting it to run right. This is what happened when i suddenly just lost all power and clank clank clank clank!

Is a top end rebuild possible or am I gonna need to take the engine out of frame, strip and clean?

The piston has basically lost one of its lower flange and as i imagine its all broken up. The engine did run again after fitting a new plug but has bugger all power. It would rev to 5k rpm and sit there with a huge puff of smoke!

Rebore and new piston me thinks and to get the bloody timing sorted. Probably why it went in the first place, it was retarded but couldn't move the stator plate any further to advance the ignition! So might have to re drill and file the elongated holes further?!

What do you guys think I should do?

https://i212.photobucket.com/albums/cc108/CB1Rocket/DSCI0148.jpg

https://i212.photobucket.com/albums/cc108/CB1Rocket/DSCI0147.jpg

https://i212.photobucket.com/albums/cc108/CB1Rocket/DSCI0146.jpg

https://i212.photobucket.com/albums/cc108/CB1Rocket/DSCI0145.jpg

https://i212.photobucket.com/albums/cc108/CB1Rocket/DSCI0144.jpg

[stirlinggaz]

where is the debris from the piston?
at the very least its needing a new piston & the bottom end flushed out.
more likely you've damaged the crank &/or bearings & will have to drop the engine & split it,
have fun!
cheers,
GAZ
edit : the crank doesnt look in the best condition either, suspect your going to need it replaced.

[Blau Zedong]

I don't think the piston failure was caused by timing, but if you can't get the timing set with the standard slots then you'll probably find your points or points cam is worn. I've done all sorts of horrendous things in the past to flush out cranks after a top end failure, but I can't possibly recommend using a garden hose to flush out the crankcases, followed by filling with duck oil or similar.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[cb1rocket]

debris? in the bottom me thinks or flushed out through the exhaust!?

Yet to see if there is any movment in the con rod.

Whats the best way of getting the crap out the bottom without splitting?

[stonesie]

If you want to re-use that crank case it MUST be split and every part cleaned thoroughly, it only takes a tiny fragment to get into a gearbox bearing to start it on the path to failure.

And "Sod's Law" clearly states that it will fail at the worst possible moment and in the worst possible way...

Locking the box and rear wheel solid during a top speed run perhaps?

[cb1rocket]

[Blau Zedong]

[reggie]

jet wash ftw if its just small bits of alumineum it wont do much harm
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when the shit hits the fan make sure its facing the other way.

[cb1rocket]

well i just checked the con rod for vertical movement, and I can't really get any except sideways movement which is allowed for i hope!

So i think i'm all good without splitting the crank halves