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View Full Version : what year crf head on 06trx?


DnB_racing
10-09-2010, 09:49 PM
which years crf head will fit on an 06trx, and do I have to use a crf cam holder? and which cam would work the best for this head for an mx build?
airmobile101
10-10-2010, 03:05 PM
Originally posted by Black Sheep
I have put 05-08 Heads on the TRX engine. I'm not positive about the earlier years so I won't say if they fit or not but I belive the 02-and up will also fit.

Yes you can use the trx cam holder and all other parts. The 02 CRF cam is considered the best for MX purposes But, like many things personal preferance is key.
So, are you using an 04-05 TRX lower end with a CRF head?
DnB_racing
10-10-2010, 09:15 PM
Airmobile I think he has been using +06 bottoms.... from some of his pics all ive seen is over 06 style... im not sure about the 04/05 bottom ends, Blacksheep seams to have a good amount of experience with head swaps!! maybe pm him or if he or anyone else has knowledge of the earlier years could let us know. thanks for the help blacksheep, this seams like this modification is the way to go for some more bolt on power!
bean2080
10-10-2010, 09:28 PM
would it just be a matter of drill and tapping a thermostat into the CRF head for the fan to work or would there be more work to it than that? do the CRF heads also use SS valve seats? im halfway considering doing this mod to my 450 as well.
DnB_racing
10-10-2010, 09:41 PM
there isn't a thermostat housing at all on the crf!! its a coupling to a hose fitting that you just put a in line temp gauge on and switch your fan to work when you want it to run
airmobile101
10-10-2010, 09:56 PM
Yea, just wanna make sure before I pull the trigger for my winter project. I could care less about a thermostat anyways.....
DnB_racing
10-10-2010, 10:33 PM
ya im not concerned about the thermostat either... but Air you might want to pm blacksheep about the 04/05 bottom end compatibility
airmobile101
10-11-2010, 03:12 AM
I got an 07, so I guess I will search for 06-newer head. Good stuff!
kenny450er
10-11-2010, 05:48 PM
just woundering what are the gains buy useing the crf cylinder head
DnB_racing
10-11-2010, 06:48 PM
im hoping on performance gains! I will definitely post my progress when I finish my motor, from what Ive seen the ports have better flow design
kenny450er
10-11-2010, 07:21 PM
yea i would like to know how it works im always game for a little more power