deliema, hybrid

[1fst400]

I just sold my 400 motor on ebay for a grand .woot .. woot.

Now Im stuck. yz 426 or crf

first instinct is crf, hands doun fast. good. brap. nice

But I know of a yz motor that is all set up for a quad, wet sump kit, kick start extendor, electrical. for 2k + I would need probly 200$ worth of misc parts.

cheepiest crf motor is like 2k and it doesent come with anything, so it would need another 800 easy to be quad ready


Either motor I can instal No problems.

But how much slower exactly is a yz motor than a TRX450r. My budie has a 06 R with slip on exaust. Thats the power output Im going for.

and how easily is the yz motor modded. if I wanted to make it faster doun the road, does it take welll to mods? thanks.

[LT250RMan]

The YZ450 dirt bike engine has more power than the quad engine does, so i think it will be just as fast or faster, i'm starting to build myself a 400ex/YZ400F Hybrid, i'm going with a YZ400F engine because it has about 42 hp and the TRX450R engine has like 38hp both rated at rear wheel power. I found this information online.

[boricua]

whats up with the yz400f having so much more power than the 450r? where are the improvements or differences?

[figair]

1fst400
I saw you engine on ebay,thats sweet you got that price for it.I have a yz450f dirtbike motor in mine and she RIPS..Go w/the yz you wont be dissappointed.If you need all the fabricating parts (mounts,oil tank etc.. look up ss440ex he'll take care of ya.Make sure you post some pics when your done w/her......:D

[sixer3]

based on what i've been reading in the forums and stuff, there was someone on here who had used all the yz engines and a couple crf engines and said he thought the yz426 was the best motor he used and went back to it more than once

i havent had the pleasure of testing any of these motors out thought "sigh"

[eganracing]

Originally posted by LT250RMan
The YZ450 dirt bike engine has more power than the quad engine does, so i think it will be just as fast or faster, i'm starting to build myself a 400ex/YZ400F Hybrid, i'm going with a YZ400F engine because it has about 42 hp and the TRX450R engine has like 38hp both rated at rear wheel power. I found this information online.

was the yz400f engine in a quad or dirtbike? the engine would make more power in a dirtbike because there is less friction and not as much stuff turning.

[LT250RMan]

Originally posted by eganracing
was the yz400f engine in a quad or dirtbike? the engine would make more power in a dirtbike because there is less friction and not as much stuff turning.

The engine itself produces the same or more hp even at the crankshaft

[eganracing]

ok so those numbers r based on crankshaft power?

[LT250RMan]

no thats at rear wheel hp,even at rear wheel hp the bike engine has 4 more hp than the quad, and i dont think a longer axle and 1 more tire will take 4 hp to drive.

[1fst400]

I talked to a guy at atvfourplay and he said if I went with the yz engine over a crf I would absolutly hate myself. I found a 450r motor 2004, kick start, diecent price. comes with some stuf. cant be that hard to get that sucer cramed in there. I saw some pictures in the powertrain section of someone that had done it.

[figair]

My opinion ,
Why do all that work for a 450r motor,the torque and power from a yz or crf is uncanny,you might as well just buy a 450r then,and save yourself time and money.If your gonna do the hybrid go w/the yz or crf.Atvforplay does there conversions,and there awesome.I know they like there crf's but I guess its your own opinion on what ya wanna do.I never had one w/a crf motor but people say its easier to ride,the yz tires you out more thats what I have read in recent topics about this subject.have you tried http://www.jbatvracing.com/go under products and motors he has a crf and a yz ready to go.Good luck again,and I guess well see what ya go with....

[figair]

sorry.....www.jbatvracing.com

[1fst400]

I would do that, but Im having troble finding a crf motor at a diecent price. I have already thot about getting a new 450r and that is more way more money to get it to handle like my 400.

[ss440ex]

Buy the bike and do the YZ