I bet the valves are still in spec Long live the genesis head... but I bet it goes away in 2010

That's what happens when you remove the backfire scree!

The head on the the new WR250 is a four valve head and can get 33hp. pretty easy.
I just started to get used to my Kawi 450 I think I see red

i know for a fact on graves supermoto bikes they weld in the 5th valve and turn it in to a 4 valve head ...more hp ...

paul yes that can happen when you cut the screen out ... who is to say that his filter is serviced when dirty ..... i have cut out a lot of screens and thats some that i tell the person that you need to have a fresh clean filter all the time ....

I'm not saying the 5 valves help the performance at all, they just increase the lifespan of the valve train.

quote:

Originally posted by Paul 061:
http://www.motocrossactionmag.com/ME2/dirmod.asp?sid=&n...4E0FAD7F3FBDBB226061

Two questions, How long do you think that header will last and do Honda's currently have rocker arms?

the header will last say...ohh...half a lap.
i love hondas
but the 09 is like taking a turd and calling it chocolate.

WOw......Thats funny that you guys think the header is going to get trashed that quick just b/c it routes around the front of the frame. I know it's been an ice age or so, but you remember those bikes.....remember you had to mix oil in the gas....what were those again??? Oh yeah two strokes and they had headers made of mild steel not stainless. They were also 10X fatter and I can't remember ever smashing a pipe on any of my bikes. A ding here and there yes, but never smashed. I've assembled two of these now and looked them over and over. I don't think there will be a problem unless you go to a ti header. I'd stick to a stainless header and get a ti mid pipe and muffler, if your gonna go to an after market system.