I have two grubee bikes; both 80cc/66cc. Both died recently; kind of a spit'n die situation where something scored the cylinder wall. I ordered two replacement cylinder bodies and sets of rings. Got both up & running with the new replacement parts. Then, with both bikes I heard a ticking (or perhaps rattling) sound, that would occur at higher rpms when my torque requirements lessened. Bike (1) made it through the one gallon break-in period; then basically the same thing happened again - (Spit, died & seized-up) Upon inspection, I found a broken-off chunk of piston metal in the upper chamber. Also, it was like a layer of black tar inside. Bike (2) I've set aside until I determine why the heck I'm having such luck. So... lesson here? I guess I should have replaced w/a new piston as well - and don't allow carbon build-up.
I'm mixing synth T2i oil 4.5 oz/gal (after break-in) & using gas station premium.
Q] Any tips or explainations why I'm having successive cylinder problems like this?
I'm mixing synth T2i oil 4.5 oz/gal (after break-in) & using gas station premium.
Q] Any tips or explainations why I'm having successive cylinder problems like this?