Jedediah Haines championship wr450

The brake hose made that much of a difference.

 

Interesting!

 

its not as much of a difference from stock as the gytr tuner or a good slip on pipe like the fmf powercore4, but what good is that power if you can slow down or not hit trees LOL i'll take control and rideabillity over power anyday

Great thread, thanks for sharing the details on your bike setup!

 

 

Yeah, it would do that, alright.  For the unfamiliar, the reason I asked that is that there are 4 different cam sets fro the YZ450, the '03-'05, '06, '07, and '08-'09, each with progressively closer lobe centering and higher rev bias.

 

grayracer, in your opinion which set would be optimal?  I like the strong low end of my 06 so I was leaning that direction.

The '06 is a good choice, overall, but on paper at least, the '03-'05 cam should be even stronger on the bottom with a little disadvantage at high RPM compared to the '06.

 

If you use one, you may have trouble getting the electric starter to work well with it because the length, and therefore timing, of the decompression pin may be wrong.  Lots of threads regarding the matter, though, and it can be resolved.

I'm content with the power spread on my 06, so if I can put a WR in the garage I'd probably go that route.  I'll do some searching for the auto-decomp issue you mentioned, thanks.

Did you just cut Y pipe out of the stock water pump outlet? Or did you replace it completely with 250f style? if you cut it did you flare end with something?

Did you just cut Y pipe out of the stock water pump outlet? Or did you replace it completely with 250f style? if you cut it did you flare end with something?

 

i just cut the Y section off the fitting, i used a pair of channel locks to flair it out some but not too drastic to tear a hose putting it on, remember to file any burs off though if you cut it!

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