Ready to buy my first engine...

you may want to read the threads on the problems with the 4G and how to fix them then decide if the extra $250 is worth it

For a 4 stroke try Gas Engines at Harbor Freight Tools EZ is a nice solid set-up, I actually have one for sale http://motorbicycling.com/f23/ez-moterbike-rear-belt-drive-35519.html you can check out My 1950 Panther to see how it looks

The Q-Matic drive will bolt to the 99 CC HF motor, as the bolt pattern is the same on the drive side of both motors.

Have fun,

I have a couple of new 79 CC motors [CARB approved] still in the boxes if anyone in CA needs one. We purchased them to test the Q-Matic drive, however we only ended up using one of them for the "mock up" and testing. We purchased 3 of them originally and paid $109.00 each plus shipping.

The actual difference is only 17.45 CC between the 79 CC [legal in CA] and the 99 CC [not CARB approved].

The 99 CC is slower out of the box, because the main jet is much smaller than the 79 CC motor. The 99 CC has a .025" main and the 79 CC has a .031". The 99 CC is a slight bit faster on top end if the main jet size is increased [45 MPH with larger main jet and tuned flex pipe exhaust].

You can not run the motor on a bicycle without major ratio changes. As an example.. if the motor has a 10 tooth drive sprocket you would need a 100 tooth rear sprocket to arrive at a 10 X 1 ratio. I would guess there aren't any 100 tooth sprockets made to fit a motorbike, and even if there was one it would be so large it would hit everywhere on the bike frame, and cost a small fortune. The ideal ratio on both the 79 CC and the 99 CC is 11.55 X 1, and could be modified to as low as 10 X 1 and still work [very high top end, poor low end power].

There are other ways to transmit the power to the rear wheel besides the Q-Matic, however the end results are far less, a much wider drive system and most likely will cost more than the Q-Matic drive. Other systems ask you to install the clutch on the motor shaft [much wider], use chain [noisy] in the primary and spin the clutch at full engine speed [takes more power to spin a clutch at 4000 RPMs than at 2000 RPMs]

Hope this information is helpful.

Have fun,

Answer these questions.
How much am I willing to spend?
How fast do I want to cruise at?

I prefer Honda 35 or 50.

So Q if I bought one of your 79cc motors, what do i need to install it on a felt frame. Because i might just snag one of those from you. What does the motor come with???