250 4-Stroke hybrid?!

[400ex_rider13]

Does anyone have a 250 4-stroke dirt bike engine in a different frame like a 400EX, 250R or whatever it might be.

[250x_kyle]

ive seen a few crf 250s in 250r geometry frame

[jonboy]

I wonder if you could retain the dual exhaust off the crf250 to put on the quad. That would look pretty trick

[DOHC]

someone on this site did a 250r/crf250 hybrid last year, there is pics on the site but i can remeber where they are ill try to find them tho. His crf 250 motor is 04 i belive so it doesnt have 2 slip ons

[DOHC]

This is it http://www.exriders.com/vbb/showthread.php?s=&threadid=292682&highlight=crf250+hybrid

[miniquadmom]

got a yz250f motor in a 400ex frame and it's for sale!

[jay80]

Any idea of average HP the 4-stroke 250's put out?

[fastR]

why would u ever want a ****ty 4 stroke in a 250r, a 250 4 poke has NO power compared to a 250 2 stroke

[miniquadmom]

The reason we did that was to stay within the ama guidlines. My son is only 14 he can be on a 90-125cc two stroke or a 90- 300cc 4stroke. It puts out about 38 hp stock. The stock four stroke yz250f is very strong! It will easily out run a stock 450 quad motor. It has tons of torch and low end grunt. We have built a lot of quads and this quad by far is one of the best ones we've ever put together.

[raz535]

A freind of mine built a YFZ250 last week, he used the YZ250F motor out of a 2007 dirt bike, and a 2006 YFZ450 minus engine.
The only snag was the 250 motor is wider than the 450 motor, where it bolts into the 450 swingarm, he simply ground it out with a bench grider, and it fits beautifully now
The quad absolutely flies, and he just rode a 2 hour Xcountry yesterday with no problems.
It is designed for MotoX though, and he will race it for the next few weeks.
Thi is also designed to fit into the below 350cc four stroke class, and blows the Honda300 and Raptor350 away.

[440_Nick]

Ive seen them in YFZ's