Arens frame and them DB motor question

[Greg Z]

IF I bought a Dirt bike CR or YZ 450 motor would i have to counter balance the motor? what whould I have to do to make it run in the arens frame?

example do I need to do anything with the tranny counter balance? anything like that?

[440ex kid]

They already have counter balancers on them. If you buy an arens frame all you have to do to get the motor running is bolt it up in the frame.

[wilkin250r]

Those motors are already counter-balanced, so you're in luck there. There really is no way to counter-balance a motor if it doesn't come like that from the factory, there's no such thing as an aftermarket counterbalance kit.

[Greg Z]

mmm nice how much do used CRF and YZF motors go for that r good condition?