whats the differance? bore? stroke? both? ive heard the 49cc is better for top speed but the 66cc is better for low end torque. is that true? all ive ever had is the 66cc.
Probably not. My first bike was a 49cc and I bought the 66cc head kit. It turns out that the flanges at the bottom of the head do not fit into the bottom end made for the 49cc, so there are subtle differences. I WAS able to upgrade the 49cc to a 55cc.I currently have the 49cc, seems pretty slow, then again it's my first bike. I was curious how much more performance I would get vs the 66cc? Can I change the head into a 66cc?
wait- the thread is 49cc vs. 66cc. You just mentioned a 62cc ( news to me) , and your 69cc. then you go back to the 62, and then the ever-so-popular old faithful 67cc. so just how many sizes do you have? 49, 62,66, 67,& 69? is there a 71cc somewhere? cause that's the year I was born and it would probably run real smooth if you know where i could get one...I suppose you were right by saying "good luck".I have a one 62cc and one 69cc from dax, when i put them side by side there is a difference in ever aspect, the bottom end is smaller as well and the exchange ports are molded different as well as a smaller jug. The only thing that may be the same would be the mag and clutch covers. I had a 62 on my rock-hopper and didn't like the power much as i have always ran the 67cc, i recently swapt the motor out with a 67cc, the motor was larger and fit the bike better. Good luck
That's a very helpful guide rohmell, thanks for posting it!