Wr426f misfire at 1/2 to 3/4 throttle on cruise
Posted July 07, 2012 - 12:35 AM
Any help would be much appreciated
Posted July 07, 2012 - 04:28 AM
Posted July 07, 2012 - 11:45 AM
Posted July 07, 2012 - 01:35 PM
Posted July 07, 2012 - 04:57 PM
Posted July 08, 2012 - 04:51 AM
Any help is much appreciated thanks again Daz.
Posted July 08, 2012 - 04:55 PM
To have the full power potential of the bike, open the airbox back up, and then re-jet properly. Make sure you have the proper pilot air, and main air jets for your bike (YZ is different than WR because of the ACV). If I were you, I would disable the ACV circuit and use the YZ pilot air jet. I did it and it makes tuning a lot easier.
Then work on the fuel jets starting with the pilot jet and main.
The needle and needle position will have to be adjusted somewhat based on your feedback. I tried both JD needles (from my kit purchased in 2002) at different clip positions until I found a combination I liked. I think I wound up using the blue needle (cold weather) year round, even in 100 F weather as it seemed to run the best.
Follow the stickied guides to help you along the way. You will have more power than you had with the airbox taped off without being lean like you are now. With every mod you do, you will probably have to tinker with the jetting some as the relative ratio of air to fuel will change a bit.
Finally, in my experience the very best free-mod you can do is the O-ring mod if you haven't done it already.
Edited by Pooley, July 08, 2012 - 04:58 PM.
Posted July 09, 2012 - 10:05 PM
Posted July 14, 2012 - 10:36 PM
Minor hijack here
Just fixed my ap circuit , can now crack open throttle and actually have power.
and now have VERY ROUGH running at 1/3 - 2/3 throttle.
Full throttle is awesome. Idle is and very low is ok.
I'm thinking tps might be playing up so I'll try unplugging it next ride.
Anything else make it run like crap at mid throttle?
Posted July 16, 2012 - 01:59 PM
Posted July 17, 2012 - 05:27 PM
Posted July 17, 2012 - 05:44 PM