2008 crf450r valve housing... Your thoughts

Here is a picture of my value exhaust port. Please let me know its anything stands out to you.... Has this housing been modified from oem?

1439147822914.jpg

I've seen that on other stock heads, but not that deep, and not on an '07/8 R head.....

Here's another angle...

1439158976682.jpg

Better view.. Porting?

1439159057603.jpg

Absolutely not a stock head.

 

Technically not 'porting', as the volume and angle of the ports overall have not been changed.

 

Some sort of 'scavaging trick' using the grooves.

 

Never seen it before, and could find no info about it. 

Someone here will know.

 

A real porting job looks like this: (my crfx)

 

kranniehead018.jpg

Edited by KRANNIE

Do you think it would make a difference if I sent this out to be ported and polished? It is much rougher in the inside compared to yours

Do you think it would make a difference if I sent this out to be ported and polished? It is much rougher in the inside compared to yours

It's supposed to be rough, that's how it comes from the factory.

You make the ex smooth and the intake less smooth ideally.

 

Do not spend money on porting until everything else is working perfectly.

 

You should save your money for maintenence, and upkeep, not porting.

Thanks for the help!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now