04 WR450 stumbles bad at mid rpm or when I rip the throttle.
Posted October 02, 2014 - 07:25 PM
Posted October 02, 2014 - 09:48 PM
Have a look at your plug. If its really sooty you need to lean it out.
Jetting might be totally wrong, prob why PO sold it !
Not too difficult, just only change 1 thing at a time.
Posted October 03, 2014 - 08:04 PM
This isn't a bog; its more like the carb is giving me the middle finger and wont go past like 4 or 5k rpms.
I just pulled apart my carb (for the 3rd time in a week sigh) and here are the jet sizes:
Jet Needle: 4th notch (correct according to shop manual) Jet needle is probably stock.
Fuel screw: Adjustable fuel screw - I installed an o-ring and spring after I lost them during disassembly. Washer still there. No matter what adjustment, stumble does not go away.
Needle Jet with main jet screwed into it as well as another jet thing screwed into that: Needle jet has no number, main jet number appears to be scraped off so no number, and little jet screw thingy screwed into that has no number....
Starter jet: No number
Pilot jet: #50
Leak jet: 60
Accelerator pump seems to be fine. Squirts nice and the diaphragm is good I think.
Did I miss anything? All the numbers are scraped off. grr
Im going to buy all new jets tomorrow.
Posted October 03, 2014 - 10:53 PM
Could be a bad coil so jetting might not help.
New plug, Ride it hard and then check your plug.
I had a 400f used to do that when needle was too rich.
Posted October 04, 2014 - 03:01 AM