QUOTE=racing fan;282338]i have seen motors for pocket bike both air and water cooled the[re more expensive but there high reving and can produce 7-12 hp now what i am wondering is this too much power for the bike or a bike and would you be able to fast enough to cool a water cooled engine that much?
has any one ever tried this?
link to the motors here
Water Cooled Pocket Bike Motors[/QUOTE]
The majority of engines being used on bicycles have 76mm clutches and a specific four-bolt bell housing pattern. Looking closely at the engines on that website, I notice that these engines do not have that housing pattern.
I would not use any engine without the industry-standard four-bolt pattern. The reason for this is that you need to engineer your drivetrain and sprockets to be around 18.75:1. With a 10-tooth engine sprocket and a 60-tooth rear sprocket, you only get 6:1 final drive.
You need to be able to bolt on an 18.75:1 Staton chain drive box
or a 5:1 pocket bike gear box.
Look elsewhere for a powerful engine. You could try here:
http://thatsdax.com/index.html
or here:
http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.4506/.f
