Converting Gen III CR250 to CRF250

robertg · Post by **robertg** » January 8th, 2010, 5:15 am

I think I'm going to convert my conversion and I going over what parts I am going to need. So far I have frame, subframe, tank, plastics, airbox, seat. I'm thinking I could make the rads fit, however CRF250 rads are plentiful. I don't know if the swingarm will fit also.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 8th, 2010, 6:22 am

i sent u an email of pics, too lazy to post them

robertg · Post by **robertg** » January 8th, 2010, 7:17 am

I got the pictures. Thanks.

robertg · Post by **robertg** » January 10th, 2010, 11:37 am

I think the CR and CRF swingarm will interchange. I measured a 09 250X yesterday, and the dimensions seem identical. The newer bikes have a more rounded edge on the swingarm, and a different chain guide. There are about 15 different part numbers for CR and CRF swingarms, even CR125 and CR250 have different part numbers. For every year each bike has up to four part numbers for the swingarm. 07 CR250 and 05 CRF250R share one of the same part numbers, and 07 CR125, and 07 CRF250X share one of their part numbers. I have an 04 CR125 swingarm here, and it weighs 3925g with the chain protector and bearings. I bet a new one is slightly lighter.

http://www.youtube.com/user/500bigbore · January 10th, 2010, 12:51 pm

rumor is the new one is alot lighter, some dudes were swapping to the crf one for that reason. i also have a 03 450 swingarm, identical to my 03 250 with 3 different holes drilled to hold the brake hose. no talk of length changing? i can measure nicks 06 250f this week

robertg · Post by **robertg** » January 10th, 2010, 1:04 pm

Mine has two holes, casting mark is KZ4V.

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 10th, 2010, 7:10 pm

both of mine are that #, the one with the spring is an 03 250, the other is the 450

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » January 11th, 2010, 8:00 am

mine says 3820g, and is casting #KZ4V, thats with bearings in, no bushings, but includign adjuster bolts

AMA714 · Post by **AMA714** » January 11th, 2010, 12:09 pm

speaking of swapping parts... Will the CRF style rad shrouds fit on a 03 CR tank. I am looking at a Gen 3 conversion but like the new style plastics better.

HrcRacing · Post by **HrcRacing** » January 11th, 2010, 2:31 pm

AMA714 wrote:speaking of swapping parts... Will the CRF style rad shrouds fit on a 03 CR tank. I am looking at a Gen 3 conversion but like the new style plastics better.

The bolt holes don't line up (look at how close the Gen 4 shroud bolts are on the tank) and the Gen 4 (CRF450R shown in pic, CRF250R is the same/similar) seperates at the tank and the tank buldges between them, while the Gen 3 is solid. IMO, you'd be better off trying to get a CRF250R tank to fit. No idea if it will.

97af · Post by **97af** » January 11th, 2010, 6:15 pm

There you go again with those magazine quality shots again Robert...
Geez.

HrcRacing · Post by **HrcRacing** » January 11th, 2010, 7:33 pm

Well, I can't take credit for those Ed.

RideRed · Post by **RideRed** » January 11th, 2010, 9:26 pm

The CRF shroud is much nicer looking IMO.

BannedCR500Riders.com

Converting Gen III CR250 to CRF250

Converting Gen III CR250 to CRF250