To Eric, Rich and the likes- Is it possible to down size a 250 motor to a 200 or 220? I ride in nasty terrian. Nasty rock and root sections. The races are 3 hr harescrambles. Now that I have finally got the suspension working right, I want to tackle the motor issue.
I have a 05 YZ 250 two stroke with low hours on it. I did a powervalve mod and added a washer to smooth the bike out. Put a 13oz fww on it and the bike is still too much. I just rode a 08 KTM200 and liked the motor. Now I know Eric does a ton of big bores, ever done a small bore :)
The KTM is 193cc and shows a bore and stroke of 64 x 60mm (2.52 x 2.36").
The YZ is 249cc and shows a bore and stroke of 66.4 x 72.0mm (2.6 x 2.8")
I have a 05 YZ 250 two stroke with low hours on it. I did a powervalve mod and added a washer to smooth the bike out. Put a 13oz fww on it and the bike is still too much. I just rode a 08 KTM200 and liked the motor. Now I know Eric does a ton of big bores, ever done a small bore :)
The KTM is 193cc and shows a bore and stroke of 64 x 60mm (2.52 x 2.36").
The YZ is 249cc and shows a bore and stroke of 66.4 x 72.0mm (2.6 x 2.8")