[jdowpe]

I'm a newbie, please forgive.
2007 150rb with an 11 oz overweight flywheel.
Where do I start on the R&D flex-jet adjustment and where should I end up? If I slow the idle down, I backfire on deacceleration. If I go up, the idle hangs pretty heavy. bike runs fine, just need a little help on how to adjust this.
By the way, I'm not racing, backwoods only.
Thanks,
JIM

[riddler9]

I am no expert on the subject, but this is what I have been taught...

Set the screw at 1 turn out. Get the bike warmed up, then increase the idle to 2600 RPM (normal idle for your bike is 2100 +/- 100). Having a fan run into the radiator will help keep the bike from overheating. Your objective is to turn find the spot where the idle is highest. Make all turns with either 1/8 or 1/4 adjustments, with not more than 1/2 in, or 2 turns out. Slowly turn the screw to find the highest idle. If the idle goes up at any point, keep turning (again, no more than 1/2 in) until the idle drops off. Turn the screw back the opposite direction until it falls off again. Then put the screw in between these two fall off points. This should give you a good base line. Turn the idle back down, then make very fine adjustments while riding if needed.

If you cannot get the idle to go up, or if you need more than 1/2 closed or 2 open, then you need to change the slow jet (bigger for more than 2, smaller for less than 1/2).

Your backfire may be more of a problem with the AP. I would consider an adjustable R&D Power Pump or Boysen Powershot.

Again, no expert. Someone else may have more solid advise.

[Asmith]

http://www.crfsonly.com/forum/viewtopic ... #119477url