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What is recommended for a holed piston?

DimitriT

DimitriT

Forum Sage
Past Site Supporter
Is a bottom end disassembly necessary? I was thinking an oil change but not a bottom end. Hole looks small and the motor ran fine on 3 for 20 miles (got me home).
 
How did the piston get the hole? (burn thru or valve hit....) Remove oil pan & look for bits of metal. Not likely you will have to dig into the bottom end.

And, you'll have to replace the piston..... Yeah, I know, as a newbie here I shouldn't be a wise guy but I couldn't resist

Paul
 
Bottom end should be fine, would be a good time to clean the oil pickup screen though.

Holes in pistons are typically caused by detonation. Make sure you eliminate the root cause or it could happen again.
 
Not sure how it happened. It's a burn-threw.

I had just put the head back on after replacing a bad valve seal on that cylinder. Could carbon deposits on the crown, from the oil, have caused a hot spot? I cleaned the cumbustion chamber around the valves but I didn't take the carbon off the pistons. A leaky head gasket perhaps? I had cleaned the carbs before reinstalling them. Could I have plugged up the main jet somehow? Stuck slider? Bike had good power right up to the failure and was smooth past 6k RPM so I don't think it was the carb.

Theories are welcome.
 
chef1366 said:
Lean conditon?
Friggen bummer man :-|
Click to expand...

Not too bad really. It was on the 550 and I scored a NOS piston and head gasket on the bay for $50 shipped.

It's interesting how I beat the pi$$ out of that bike but on the 750 I'm happy to just lope along and watch the scenery.
 
"Not sure how it happened. It's a burn-threw."

Be sure to use the correct heat range on the plugs. Too hot of a plug can cause a burnt piston especially if the mixture is lean also.

Paul
 
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