Hi everybody, How can you tell from just looking at the motor if it's 49cc or 80cc. I bought a gas bike at a garage sale for 75.00 bucks. Thanks for the help !
On that note. All 3 50cc barrels (all 40mm bore) i have are 57mm square.Head nut size is not a reliable way to tell. Not necessary to take it apart. Diameter of cylinder between the fins works every time. Obvious once you think about it.
If you can tell the difference by looking at my engines which is a 50 and which is a 66cc by the size of the head, I will give you both of them.When you look at the head on the 49cc vs the 80cc, it's noticeably smaller.