I traded my old 92 CR500 for a 03 WR450F a few weeks ago.
It's my first 4 stroke and maybe my last!
When I made the deal it ran OK and didnt smoke but it never got up to temp.
The carb is jetted as followed:
4th clip down from top.
1 1/2 turns out on air screw.
I've read that a smaller leak jet is better. I understand that 70 is big.
What the hell needle is the Y357??? can't find it anywhere.
Should I try to find a OBDWR-4??(stock)
My TPS passed all the multi meter checks.
All 5 valves are within spec but they are right on the TIGHT end of spec.
It starts OK. runs great with the choke on. runs OK when off choke and warmed up.
Has a bit of bog when off idle but I figure that is the 70 leak jet.
I think I have the AP set correctly. I just did what the manual said to do. When I pick up the slide it shoots a decent stream. It doesn't hit the backside of the slide or anything.
If you half lazy run thru the gears it runs great, but when you put a good load on it (working it up a hill) it pings and makes a terrible sound in the mid to upper RPM range.
At a standstill in nutrual I can rev it right up and it will sound fine but as the RPM's come down I get white smoke coming out the pipe.
Brand new spark plug is very black and pretty ugly after 10 minites.
peering in the intake and exhaust of the head shows nothing obviously bad.
I'm still running the gas that came with it when I got it. Have no idea what it is.
Could old low octane gas with incorrect jetting(needle and leak jet) cause the smoke and noise I was hearing under load?
I would like to get the correct needle, smaller leak jet and fresh 93 octane, see how it runs before tearing the head apart to see whats going on.
Wheres the best place to get a complete jet kit with the correct needle and smaller selections of leak jets?
BTW, I have already replaced the starter clutch assembly with the 04 model.
Grey wire disconnected and shorter throttle stop screw.
Edited by adam500, August 09, 2014 - 04:18 PM.