Weird Jetting problem

[WR450RICKO]

stock main and turn the air screw out 2 turns with needle in position 4.

48 pilot

works for me

Good luck

165 is stock for my 06' wr450

I installed the GYTR AIS removal kit per the instructions. The needle and 48 pilot jet are the only things that have been changed in the carb. I did install a Zip Ty air/fuel screw and have it turned out 2 3/4. I ride from sea level to 5000' in 50 to 90 degrees. My bike runs great with smooth power through the range and no decel popping. Everything else is stock.

[CRF45OX]

the fuel i use is 98% octane, what octane fuel does everyone else use and with what size main jet at low altitudes and cold temperatures?

I think this will be a worth while comparison.

[WR450RICKO]

the fuel i use is 98% octane, what octane fuel does everyone else use and with what size main jet at low altitudes and cold temperatures?

I think this will be a worth while comparison.

91 or 92 octane

[bandit99]

91 or 92 octane in the states

[CRF45OX]

hmmm, this weird jet problem is starting to make more sense now.

[chrispy1202]

Do you notice your head pipe to be hotter than normal. Maybe too lean. i have the 170 main, blue needle in third from top position, with yz exhaust and run 91 or 94 octane and my '03 450 rips.?

Cheers

Chris.

[CRF45OX]

no my pipe does not glow and i run 98% octane with a 160 main and its perfect - dosent like fuel with a lower octane rating though - you can feel it start to get lean in the midrange.