Can't get my air/fuel mix right, either too rich or too lean

SprEE*MP* · Post by SprEE*MP* » Thu Oct 23, 2008 7:40 pm

Hey, I'm having problems with air/fuel ratio. Here's what's happening:

1: Main jet is on 4th notch, (factory setting) air skrew all the way in. I will randomly bog on and off. Spark plug = nice light brown.

2: Main jet 5th notch (full rich) air skrew have had in many settings. No bog. BUT spark plug= ALWAYS BLACK!!!

-my gas IS good.
-No clue about the oil (all i know is that it IS 2-stoke oil, and blue)
-Air filter is good.

My question: what's going on/ how do I fix it?

Kenny_McCormic · Post by **Kenny_McCormic** » Thu Oct 23, 2008 8:50 pm

Clean carb?

Bear45-70 · Post by **Bear45-70** » Fri Oct 24, 2008 12:43 am

Go back the the fourth notch on the needle (it's not the jet, but fits into the jet) and adjust the air screw to 1 1/2 turns.

Dac · Post by **Dac** » Fri Oct 24, 2008 1:15 am

Bear45-70 wrote:Go back the the fourth notch on the needle (it's not the jet, but fits into the jet) and adjust the air screw to 1 1/2 turns.

its what i would do...

Clivester · Post by **Clivester** » Fri Oct 24, 2008 2:28 pm

Air screw is only supposed to impact the pilot jet i.e. the first 1/4-1/3 of throttle. If its having an effect elsewhere in the range you have some other issue.

Clive.

scooterwerx · Post by **scooterwerx** » Tue Oct 28, 2008 2:59 am

is this thing stock? modified? is the plug the correct heat range? is it a good plug? the needle only controls mid throttle mixture. what helped me out was actually marking out 1/4, 1/2, 3/4, and wot on the grip with a marker and a reference line on the plastic fairing to determine exactly what needed adjustment...

SprEE*MP* · Post by SprEE*MP* » Sat Nov 01, 2008 8:47 pm

plug is perfect, the only mod is a drilled muffler
-even with the one on the fourth notch and the air skrew 1 1/2 out, it still bogs