KX Riders

Maintenance & Technical => KX250 / KX125 => Topic started by: white rat on December 30, 2007, 12:55:19 AM

Title: 86 KX250 motor>88 KX250 frame
Post by: white rat on December 30, 2007, 12:55:19 AM

Before I rip a good running bike apart, will the motor from my 86 fit in my 88? Will the 88 carb and pipe fit the 86 motor?

Cheers

Title: Re: 86 KX250 motor>88 KX250 frame
Post by: The Flyin Hawaiian on December 30, 2007, 07:17:20 AM

The 88 carb was a Keihin PWK39 crescent slide carb where as the 86 was a round slide 40mm Mikuni. I dont see why you couldnt make it work. May have to rejetand the carb may not fit into the 88 airboot properly. Cant help you with the pipe and swap question. Ive been keeping an eye out for a 86 250, Id like to restore one someday.

Title: Re: 86 KX250 motor>88 KX250 frame
Post by: CR480R on December 31, 2007, 12:17:25 AM

I dont know about the bottom and top engine mounts, but I do know the front mount is in the same location... The '88 intake boot and carb will work, but the pipe will not fit without mods as the angle is different on the exhaust port exits... The pipes might also be tuned slightly different because of the differences in bore and stroke... You might try fitting the '86 pipe into the '88 frame... I wouldnt be surprised at all if it worked...

Title: Re: 86 KX250 motor>88 KX250 frame
Post by: CR480R on January 14, 2008, 09:07:58 PM

are you parting the '86?  If so I am interested in the frame...