80cc big bore

[sidthesloth]

Correct, but it should still run.

[juice]

Does anyone have or know of a successful 80cc 4 stroke conversion ?

[blue]

Blue, I have two sym vs scooters, a 125 and a 150, the only difference is the cylinder/piston. the only difference in the tramsmissions is the roller weights, 10 v 14 grams and the drive boss is 1mm shorter on the 150.

some scoots are easy to mod and some are not most the 4 strokes I have seen are 50s being made to go faster by bring theam up to a 70 kit or 80 they well coast ya later by doing so.now going from 125 to 150 may be dif.

[woodcutter]

scuzz, did you installed piston rings corectly?

[Hoolander2]

So it did start at least once but cut out.  Spark plug is wet.  Try running without the air filter for just a minute.  That might tell you if your jetting needs to go up or down.