Rejet a stock bike?

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#11

06-06-2012, 01:09 AM

jhoffy22

Senior Member

1st Gear Member

Join Date: Jun 2011

Posts: 592

Quote:

Originally Posted by IDRIDR

I'm at 2,500 ft here and generally ride up from here to 8 to 10,000 feet. Next weekend I'll drop down to 750 feet in Hells Canyon.

I'm pretty sure I can go back to 35 on the pilot. Others here mention doing so with 300, 331, & 351 jugs. I'm getting very little feedback from the Kouba screw until down to around 1 turn out and less. My tail pipe and rear fender is building up the black stuff. On the main jet, the plan is to spend some quality time on a lonely road with some WOT runs and a few different main jets and dial it in. Bill's advice was "two jet sizes up on the main." I was rich before the 351 kit with a 124DJ. A 128DJ is eight sizes up from stock! IMO, a lot of us here tend to overjet the main based on advice from others who have overjetted the main.

This is what I have heard - as a general rule of thumb 0-1500 feet will require the same jetting due to negligible differences in air density. For every 1500-2000 feet that you go up, you drop one size on the main jet.

If this is the case, than I should be running either the same main jet as you or one size higher (dynojet). I think that I'm running 132 main and 38 pilot right now.

Seems that I am probably running a little rich since I'm at ~1,000ft above sea level. Looks like I will be tweaking the jetting. I thought that something was off to be honest. My tail light is already black from the exhaust and I just put it on yesterday, same with my license plate. I played with the kouba screw today and turned it all the way in and than 3 turns out and the idle didn't change at all. It remained between 1,600-1,900 RPMs which is a little higher than I think it should be idling.