07 CRF Head Qwestion

[lrrs428]

Hey I was wondering if anyone knew if my head from my 03 will swap to my 07. My 03 had all the work done to it and I think im having valve problems with my 07, it starts hard and wont idle at low speed. Went through the carb and tried a million different jet and set up settings. Thanks, Clarkzilla

[seth399]

hey dude, I'm not positive but I had heard the 06 or 07 and up just had smaller exhaust valves that helped with low end power? I think they would bolt up but I would maybe ask or search on thumpertalk.com. There are a few engine builders on that site that deal with crf's

[CEO]

Hey I was wondering if anyone knew if my head from my 03 will swap to my 07. My 03 had all the work done to it and I think im having valve problems with my 07, it starts hard and wont idle at low speed. Went through the carb and tried a million different jet and set up settings. Thanks, Clarkzilla

Have you checked your valve clearances? From what I have seen on thumpertalk, any time you start to have trouble starting these bikes, it's oftentimes the valve clearances getting too tight due to valve seat wear... you might just need a shim/adjustment

[Awesome]

You can search all of the part numbers on ronayers and see what parts fit what models.

[lrrs428]

valve clearence is perfect on the exhaust and +-.01 on the intake, im wondering if the valves them selves or beat to crap

[lrrs428]

seth checked the part numbers they are the same for 03 and 07 thanks

[lrrs313]

Part numbers are different according to motosport.com. Checked both the cylinder and the head. Exhaust valves and cam are different part numbers also. That said, can't hurt to try.

[a13x]

Thumpertalk.com is your friend!

[Crash Dummy Denno]

Have you checked your valve clearances? From what I have seen on thumpertalk, any time you start to have trouble starting these bikes, it's oftentimes the valve clearances getting too tight due to valve seat wear... you might just need a shim/adjustment

go read a magazine review chrissy you dont know shit

frigain buys a tard and thinks he can give advice... im gonna slap you in that gigantic head of yours

[lrrs428]

so yes you can by the way, i did and it worked i just had to use the 03 exhaust and make my own brackets.

[seth399]

so yes you can by the way, i did and it worked i just had to use the 03 exhaust and make my own brackets.

nice, I think it was 06 or 07 they went to a larger diameter header pipe?

[lrrs428]

the curve is differant the 07 pipe on the 03 head rests against the motor to much i think it dumps diff out of the head on the 03.

[seth399]

ah I see, glad you got it working either way