Switching throttle bodies

1 reply to this topic
  • iceracer8

Posted March 18, 2011 - 06:59 AM


I posted this in the jetting section and didn't get much.

Looking into the idea of putting an 09 CRF 450 throttle body on a 10 YZ450. I know of the Simon Smart Body and have called on that. Looking for a bigger throttle body and want to go bigger than what the yz TB can be bored. Just from the stock number the CRF is 50 and the YZ is 44. Any info would be appreciated. From some of the numbers I have heard from the flow bench the YZ head is probably the best flowing stock head out there right now. Just trying to exploit this. I race flattrack so more power is always a good thing. Had the bike on the dyno last week and the numbers were good but as any racer knows they could be better.


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted March 18, 2011 - 07:02 AM


Contact Ron Hamp at RHC and ask him. If anyone knows, it would be him. He was the first guy I know of to get 60 honest HP out of a 5 valve head, and it took him years to get there. He's already built the 2010 to over 62 HP.

Related Content


Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.