Maintenance & Technical > KX500 Original
KX500 AF Running like a 200
RKPerformance:
So i just picked up a new to me 2000 KX500AF scoot. Took it out for the initial run and it is a major dog compared to my CR500. This thing will barely, i mean barely pull the front wheel in first. So I start looking into things including the jetting. It has a FMF Fatty pipe with fmf silencer...rest is stock. 162main, 52pilot. Seems reasonable to me, but it runs so crappy i think maybe it is lean. Put a 168 main in it and it wouldnt get out of its own way at all, now runs like a pw80. Check the compression it is 150 after a few kicks with shoes on cold. So then i decide to check the needle and i find a n4we needle in it. Never heard of that needle before and from what i can find it belongs in a kx250? Does anyone know why that needle would be in there and if that probably has something to do with why it runs like a pile of crap. Is 150lbs acceptable comp? Any help would be appreciated!!
kxpegger:
Pull the KIPS actuator/rod cover off on the right side of the cylinder (rectangular silver plastic piece). Start the bike up and see if the KIPS rod is pulling in and out smoothly when you give it some gas. Sounds like your exhaust valves may not be working correctlty.
RKPerformance:
I will check the powervale operation, but im thinking this needle that is in here has the bike all jacked up???
don46:
I don't think it is the needle, not sure which you have but I run the 250 carb bored to a 40.5 and use the 250 needle and have no issues.
Goat:
I too have run the 250 carb and needle before with no issues. Running a 38mm Pwk with #7 slide and 250 needle in my 87 for the past 3 years.
Hows the spark plug look? Pull the pipe and look at the piston skirt. Could be a crank seal which is the same issue I'm going through with my 87. If the plug is dark it's too rich and could be caused by a leaking right crank seal. If it's white it could be the stator side crank seal.
Navigation
[0] Message Index
[#] Next page
Go to full version