i was riding home last night, got to just about to my street and the Tomos died. engine tone didnt change, just sputtered out like it was out of gas, i had filled up that morning and hadnt ridden very far, so i knew fuel wasnt the problem (carb was recently rebuilt too). when i tried to restart the bike it revved and then backfired twice (like vrrrrrrrrurrurr PAM! PAM!) this of course scared the shit outta me, so i pedaled it home. i made my own base gasket for the cylinder out of automotive head gasket material, so i think it may have bit the dust, backfiring was probably caused by such a LEAN mixture coming out of the crankcase the hot cylinder walls caused it to preignite. it rained HARD today and i dont have a garage, so i didnt get to taking apart the top end, im going to tomorrow afternoon when i get home from school.
when i turn it over without the kill switch on, i hear a "tink tink tink tink tink" noise, im PRAYING thats not because of dead crank end roller bearings, and its just compression wheezing out the busted gasket (its $99.95 for a new A3 crankshaft at moped junkyard! but like 3.95 for a base gasket). when i order the new gasket (or crank if it needs it) im gonna get a new speedometer drive, mine is wibbly wobbly (all over the place) and i think the drive is worn out.