Hi, I've got a 2004 WR450.
It sat unused for 2 years in the previous owners garage.
Cleaned everything up, adjusted the valves, idles great, pulls hard, doesn't stutter at constant throttle, can do nearly 160kmh with the SuMo wheels, except when you try to loft the wheel from under 4500 RPM, it bogs/hesitates for probably 1/8th of a second, then pulls hard.
Currently it has
1 Turn out Mixture Screw
OBDUQ #4 Clip
Blocked Leak Jet (A hair under 1 second of squirt)
AP Diaphragm Stamped 3.1?
AP Linkage Wired, no binding.
Stock Pipe with baffles removed (Loud, sounds like crap too, gotta replace that heavy beast)
Airbox cutouts removed and snorkel removed.
1250 ft Elevation 20-30 degrees Celsius.
I've adjusted the AP Squirt to full advanced, and it's not hitting the slide... the bog is a lot less than when I first started tuning this bike a few weeks ago.
Now... I don't claim to know it all... and probably made some mistakes along the way...
But I feel like the AP squirt with the screw turned out completely should be hitting the slide? Maybe someone swapped in the wrong diaphragm?
The bike used to bog for about a half second before I took the time to try adjusting the AP squirt, so it's getting better, but I can't even adjust it to hit the slide, so something is wrong?
Am I expecting too much to be able to loft the wheel under 4500 rpm?
I can roll on the throttle fairly quick and it's fine, but the second I try to wack it open around 4500 or less, it falls on its face, then pulls hard, it just comes on softer than a quick roll on.