07 yz450f jetting with akrapovic


2 replies to this topic
  • jhm1138

Posted August 09, 2010 - 07:41 PM

#1

Hi guys, I just picked up an 07 yz450f this past weekend. The guy i bought it from put a full akrapovic exhaust system on it and only rode it once with the new pipe and then it sat for a year and he sold it to me :banana:. He said that he never touched the jets so whatever is in it is what the stock set up is. I was hoping that someone on here has this exhaust system on their bike and they could share their jetting set up with me?

It seems to run ok, there is a slight backfire on the downrev sometimes. I just fired it up at night and noticed the headers slightly glowing red. This scared the bejeezus out of me, but from searching around I guess its normal? I can't really see it glowing during the day.

I am just running what looks like the stock air filter. There really are no other major mods to this bike other than the akrapovic exhaust.

Any insight is greatly appreciated!

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  • grayracer513

Posted August 10, 2010 - 02:48 PM

#2

The reduced light level makes this more noticeable. It's not unusual for the surface temp 2 inches downstream to reach 850 degrees in 30 seconds or so, and that would appear dull red on a clear evening 20 minutes after sunset.

  • jhm1138

Posted August 17, 2010 - 08:31 AM

#3

Ok so I just rejetted yesterday I put in a 48 pilot (stock 45) and a 165 main (stock 160). I took it for a quick ride again and still got the backfiring on decel. Overall it feels better than before it is smoother now and was jerky before. I am thinking of upping the pilot to a 50. Do you guys think I should be touching the clip any? It is still at the stock position of 4. I am also getting a fuel adjustment screw that will be coming in this Friday will that help the backfire? I'm thinking I should hold off on the new pilot untill the new fuel screw is installed. What do you guys think? Thanks.





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