KDXRIDER.NET

Hi everybody, new to the board. Have had a KDX for a while now, but it has never had a motor in it Picked up the bike for $300 rolling, just recently I spotted a 1990 kx250 motor on eBay, and figured they were a match made in heaven. Got the motor for another $300 and now am planning on rebuilding the bike. Now can anyone tell me the main differences between a KX250 and KDX 200/220? Am I going to run into any problems trying to fit the 250 in this frame?

Thanks

Yes, you are going to have fitment problems to solve. The KDX engine was based off the KX125 engine and the chassis is built with that in mind. Also, I don't know how well the chassis will deal with the extra weight and power of the 250. I would really look for a KDX engine myself.

Hmm that's not what I wanted to hear. I would have thought the 200 would have been a similar frame to the kx250. Kdx motors are hard to find down here. Would there really be much weight difference? I thought the kdx was just a detuned kx

OnWheels wrote:Would there really be much weight difference? I thought the kdx was just a detuned kx

I can't honestly say what the weight difference is. Maybe a member has one out they can weigh to let you know.

As for a detuned KX, well, not really. It is literally a KX125 that has been retuned for low end and given a longer stroke/larger bore combo. The only KDX based on the KX250 engine is the '91-'94 KDX250 which is a completely different animal than the KDX200/220 bikes.

SS is right. You'll likely be looking at enlarging the engine cradle. Not fun....