Weird Jetting problem


26 replies to this topic
  • WR450RICKO

Posted April 30, 2007 - 12:27 PM

#21

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

Posted May 02, 2007 - 02:47 AM

#22

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

Posted May 03, 2007 - 09:47 AM

#23

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

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  • bandit99

Posted May 03, 2007 - 10:03 AM

#24

91 or 92 octane in the states

  • CRF45OX

Posted May 04, 2007 - 12:45 AM

#25

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

  • chrispy1202

Posted May 18, 2007 - 05:51 AM

#26

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

Posted May 18, 2007 - 09:21 PM

#27

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.




 
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