03 wr450 missing/skipping/sputtering.
Posted June 13, 2012 - 03:58 AM
Posted June 13, 2012 - 04:16 AM
Posted June 13, 2012 - 04:30 AM
am i right though in believing that this is a rich mixture issue?
From the sound of the plug, yes. And listen to Maniac's statement as well, one of the reasons I don't like DynoJets kits is their drilling the carbs thing.
I know for the VFR street bikes they had you drill the slides, and I've seen and heard them do that a lot. You can silicone the hole closed but it's still not "correct" once you've done the change.
But it's either rich mixture or oil getting into the plug if it's black.
Posted June 13, 2012 - 10:28 AM
Posted June 13, 2012 - 03:58 PM
Posted June 13, 2012 - 05:57 PM
Do some searching, there are quite a few jetting charts around here that should tell you what to do and how for your elevation and area.
ok so i switched it back over to stock jetting and it runs fine minus the popping on decel and it definitely doesnt have the power it did with the jet kit. the way it is set up now is a 160 main, needle w/ clip on position 5 and what ever else is standard jetting. im thinking my best bet is to go to the dealer and order a few jets and go with it. popping means to lean? so bigger main jet?
It's going to be far more than just a main jet, but yeah, you sound lean.
Posted June 14, 2012 - 03:15 PM
Posted June 15, 2012 - 05:13 AM
what part of the jetting spectrum needs to be richened when you have popping on decel? and i knew that the main was for WOT but for some reason i combined high rpms with WOT (which is obviously not always the case) and added in the popping to get the end result of needing a bigger main jet. so what part of the jetting system needs to change. my guess would be a pilot jet. am i correct?
Correct, the pilot jet is the circuit that feeds the engine when the throttle is closed. If too much fuel is fed in then you get poping. The WR tried to get around this with a air cut valve (valve to add more air when throttle is closed to lean the pilot during decel) but it just doesnt work that well. I have mine deactivated (turn diaphram backwards) its a two minute job and completly reversible if you dont like it.
With the correct pilot and fuel screw dialed in I think its probably the least poping fourstroke I've ever ridden. Nice and quiet to keep the neighbors happy!
Posted June 15, 2012 - 11:20 AM
Posted June 15, 2012 - 11:34 AM
Posted June 16, 2012 - 06:18 AM