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member
09-30-2004, 09:10 PM
ok im sure this has been asked before but im thinking about doing a conversion to my 400ex, only problem i have is decieding what the best motor to do is. I kno the crf 450 is very popular and i have considered it heavly, but i will be doin mainly MX and freestyle stuff, so if any suggestions on what motor would be best in performance while sitll bein relieable would be great.
Toadz400
09-30-2004, 09:13 PM
SEARCH. It'll be your best friend with this...LOTS of information about these conversions and what works best.
member
09-30-2004, 09:25 PM
ive been searching......
Kennethyfz450
09-30-2004, 09:49 PM
I know someone first hand who motorcrosses and he uses a yamaha 426 motor.. if you want his number you can pm me
hopefully he doesnt get mad
anyhow he also does powedercoating
Toadz400
10-01-2004, 11:10 PM
For MX I would get the YZF engine. I raced with a guy who had a YZ426F in a 250R frame bored to 440...the thing absolutely RIPPED. I did not get a chance to ride it, but he absolutely hauled *** on that thing! Of course it had long travel everything and HiPers all around;) . I think he said it cost about $25,000 all in all to make...but he bought it used for about 8K.
member
10-02-2004, 08:41 AM
Originally posted by Toadz400
For MX I would get the YZF engine. I raced with a guy who had a YZ426F in a 250R frame bored to 440...the thing absolutely RIPPED. I did not get a chance to ride it, but he absolutely hauled *** on that thing! Of course it had long travel everything and HiPers all around;) . I think he said it cost about $25,000 all in all to make...but he bought it used for about 8K.

sweet, ive already got long travel front end im workin on the rear now, ihave a rebuilt rear shock but aroud christmas im lookin to get a l/t swing arm and a l/t axis shock
and do u kno if that 426 was stronger then these new 450s?
Toadz400
10-02-2004, 09:54 AM
Originally posted by member
sweet, ive already got long travel front end im workin on the rear now, ihave a rebuilt rear shock but aroud christmas im lookin to get a l/t swing arm and a l/t axis shock
and do u kno if that 426 was stronger then these new 450s?

The dirtbike engines put out more HP and the 426 revs like a 2-stroke (much like the YFZ). If you plan on getting a 426, you should bore it out to 440 so you have that extra power unless you want to keep the stock reliability, either way...they still have awesome power.