WR426 Carb Tuning Question
Posted July 27, 2015 - 12:00 PM
Posted July 27, 2015 - 01:34 PM
The header absolutely should not be glowing when moving, period
You need to pull the carb and service it, and get the right jets in there
Do it ALL not just parts accesible from the bottom.
READ THE FAQ section to get to know your bike and copy someone elses jetting
Posted July 27, 2015 - 01:59 PM
Posted July 28, 2015 - 08:32 AM
Edited by 1slowDR, July 28, 2015 - 08:52 AM.
Posted July 28, 2015 - 09:50 AM
NCVS NEEDLE 3RD OR JD RED 4TH
STOCK STARTER JET
55 LEAK JET
STOCK MAIN AIR JET
Change the apump system to 2008 specs using these parts:
*change the apump linkage spring to a stiffer version http://tokyomods.com...arburetion.html
*replace the pump diagragm with a 2008 version/upgrade kit http://www.crfsonly....roducts_id/3932
Bike must be uncorked intake and exhaust with this jetting.......
- clean the hot start plunger and cavity and polish is corroded: use light antiseize in the cavity and on the cable
- replace the slide plate seal
- install an R&D remote fuel screw and read up on how to adjust it (highest idle speed)
Now you have a NEW carb that will work BETTER then FI
Edited by KRANNIE, July 28, 2015 - 09:50 AM.
Posted July 28, 2015 - 09:58 AM
Edited by 1slowDR, July 28, 2015 - 10:54 AM.
Posted July 28, 2015 - 03:32 PM
All real dirt bikes from 2003 to the present use the exact same carb.
Do not do the BK mod.
Your bike is NOT running lean at wide open throttle (main jet), it is very rich, unless you have a YZ pipe and lighter flywheel and a YZ head.
Pilot is for idle and 1/8 throttle only.
Needle is everything else, and the most important.
Posted July 28, 2015 - 03:52 PM
Posted July 29, 2015 - 07:30 AM
This thing seems to be running REALLY lean
I'd also check for an air leak at the boot between the carb and the cylinder
Best way is to spray the area with WD40 and see if it sucks it in
If it does, the idle will drop
Your jetting seems to be in the ballpark (unless you live in the Mojave desert)
My gut tells me something is WAY off leaning it out real bad
Posted July 29, 2015 - 01:14 PM
Posted July 31, 2015 - 12:59 PM