need jetting help
Posted March 12, 2002 - 12:17 AM
Posted March 12, 2002 - 05:57 AM
Posted March 17, 2002 - 12:43 AM
01 WR 426, WB E-Series S-Bend W/12 disks, Airbox lid removed, Throttle stop cut, grey wire cut.
Posted March 17, 2002 - 12:44 AM
you could always try 160MAJ, 158MJ, EMN needle (code is N427-OCEMN), clip 3, 35PJ, 45/50 PAS (buy the screw, it's worth the extra money), PS 1.5 turns and your APJ down to less than .5 second of squirt.
Posted March 17, 2002 - 03:22 PM
Posted March 17, 2002 - 06:22 PM
I hear you loud and clear. If you don't want to do the whole Taffy setup with airjets, try the following:
1 1/2 - 2 turns out
The needle part number is: 5NL-14916-EN and is an option for the '01YZ250F. This jetting is very close to a YZ426 except for some small alterations. Expect the mid-range power to come alive more like a YZ426, great for wheelies.
Farmboy and BIGFOOT, with stock needle and jets try removing the checkvalve on the tank vent. The tank can build pressure when sitting hot and force excess fuel into the carb to flood it. Also try turning the fuel screw inwards to lean the idle and check the response. The plug may be black from simply having too rich of an idle mixture setting.
Farmboy, try a leaner clip position on the needle (#3 or #2) for your higher altitude riding.
Posted March 17, 2002 - 09:34 PM
Posted March 17, 2002 - 10:17 PM
in many ways it's for people changing their jetting and needing some feed back more than people asking about the technical stuff.
for a technical appraisel the patrick burns write-up takes some beating.