[jensaai]

Okey, so I need some help with carb modifications!

I have a CRF450R 2004, I just put a Yoshimura TRC exhaust and a big bore kit 488cc. Got it firing 2 out of 100 tries and both times the exhaust turned red/yellow of the amount of heat that came out. Of course I didn't run it after noticing this.

I'm no super mechanic but I am trying to learn and so far it has gone pretty well. This problem with not firing and the heat could only be that the engine needs more gas? It runs too thin so to speak? And how to solve this would need some jetting?

If you can help me with what parts that needs changing and to what sizes?

Thanks, gladly appreciate your help!

/Jens Kellerman

[Aussiecrf230]

What jetting do you currently have?
Have you looked at the jetting sticky for your type of bike?

[jensaai]

My carb is stock so nothing is changed! Yes I have, but
u still need help