can you put a 250 in a 426

[yz426fride]

i have a 02 426f and i was wondering if it would be possible to put a yamaha 250 in the frame, i think the 426 may have been too much bike. please let me know if you have any experience with this

thanks

[02WR426Cali]

Of course anything is possible it would just take some fab and maybe some new parts. I think the first few years of the 250f are real similar to the 400/426 but I doubt it will bolt right in. I don't know enough technically about the differences so I can't give you any facts, but you CAN do it.

The question is why? If the 426 is too much bike right now.....you will want it someday.

[dalonar]

426 is too much? why not just roll the throttle tube so that you cant twist it all the way? 2 weeks of hard riding and you'll be fine with the 426.

[yz426fride]

to answer your question, i want to put a 250 in it because i found a cheap 250 that i could throw in while i rebuild the 426 maybe?

[dalonar]

oh, you have WAY more ambition than i would have. pretty sure none of the electronics would cross over. let alone bolt up

[yz426fride]

what would i have to do to get the electronics to match up. i can make whatever mounts i have to on a CNC machine at work so i dont think that will be too hard. but what would i have to do with the electronics

[grayracer513]

Won't fit without cutting and fabbing a taller "Y" section where the frame splits at the bottom of the down tube, which, of course, is your oil tank.

Overall, a really bad idea.

[ttr250dude]

You could sell your 426, buy a newer year 250f, and likely break even. Just a thought.

[mikewrf18]

You could sell your 426, buy a newer year 250f, and likely break even. Just a thought.

^^^

What he said. I'm sure somebody out there wants more power and you want less. I'd be willing to bet someone out there would be willing for a straight up trade. If you do decide to tackle a 250 swap, be sure and post pics. I find conversions very interesting. Good Luck.

[SEOINAGE]

A lot of work for very little gained in the process. I don't see what the benefit would be.

[yz426fride]

the 426 doesnt run, the entire motor top and bottom end are shot. i was thinking about the 250 motor because i found a cheap one, not the whole bike.

trust me if there was an easy way to get the 426 running i would be all over that.