06 WR450 Tuning help!
Posted May 04, 2015 - 06:46 AM
06 450, AIS removed, yz throttle stop, g2 throttle tube and cam, white brothers E2 slip on,
Elevation is average 260ft. Jetting is JD 170 main, 48 pilot, Scott's fuel screw at 1.5 turns. Accelerator pump is wired, gray wire mod.
I've put a new head pipe washer in and cleaned the carburetor twice, no difference. AIS plugs seems to be fine, tightened them all. I haven't messed with the ACV (air cut off valve) or checked the exhaust/intake valve clearances. Just bought the bike used and can't seem to get it running correctly. Bike doesn't have any "bog" but it will not idle or run worth a flip until it's reaches 150degree coolant temp (trail tech reading). Which is usually idling on choke for a minute or 3. Once it hits 150 it'll idle fine. My normal temps here in Arkansas are around 80-95 degrees. thanks in advance to anyone that can help me before I light the bike on fire and walk away!
Posted May 04, 2015 - 07:56 AM
Many times the pilot jet is difficult to clean correctly and needs to be replaced by the way. If that doesn't do it try a larger pilot jet or two and see how the popping is and how it runs.
Posted May 04, 2015 - 08:39 AM
Posted May 04, 2015 - 09:02 AM
You should never need larger than a 45
Either the passage above the pilot is still partially clogged making you lean or your acv valve is stuck shut or some othr lean condition
You should still have the original pioit air jet too
Posted May 04, 2015 - 11:02 AM
Posted May 04, 2015 - 03:51 PM
Posted May 04, 2015 - 06:10 PM
I've read often that people have used the 50 and 52 with no issues. That seems excessive for a stock bore bike but it is what it is. I'm going to give it a whirl and also check the ACV diaphragm/possibly do the mod.
If you do the mod you might epoxy the holes in the side of the carb then you need to run a YZ450 100 pilot air jet.
Posted May 07, 2015 - 04:39 AM