Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
Foxx4Beaver:
--- Quote from: VMXSteve on November 12, 2013, 08:10:15 AM ---Hi Guys, I just picked up a mint 1985B1 KX500 with a Mikuni VM40SS Carb, and was looking for some basic / sea level jetting specs? :?
--- End quote ---
Stock jetting on an 85 B1 is...
Main-380A
Needle-6DJ2
Jet Needle-R2
Pilot-40
...see if this is what you have, if so, run it...do a wide open throttle chop run and check your plug....chances are, it'll be a touch on the rich side, because Kawie ships them out from the factory setup on the richer side and at sea level.
Another thing to keep in mind is, these specs are for U.S. bikes.....so if you're outside the U.S., your stock jetting will more than likely be slightly different than what I listed.
staffylad:
mine was sticking on when I first kicked it over but then a few minutes late it would settle down but no tunning ther so I stripped the kiehin and the jets wer in a bad way so im ponderin the idea of a jd carb kit lol they look great ibet the bike runs wicked with one of them in just the shippin is well expensive to uk :|
reklessj:
OK here we go again guys. 1994 kx500 TMR MOTOR, port, head and exhaust valve mod, .26mm head gasket, FMF Fatty pipe stock silencer. I'm at 3300 ft I recently had to change from running straight VP C-12 TO running 50/50 blend VP C-12 and 92 octane pump gas at 48:1 redline oil. Tom told me to run a 178 main, 60 pilot, needle 4th from top and air screw 1.5 out. It is running rich all throughout! Any input guys? :?
sandblaster:
3300 ft and that jetting you should be spooging all over and having to clean out the top end by reving it frequently, or just deal with a blubbery bike.
I run 55/168 at 0-1000 ft and needle at the middle position.
I run 92 clear gas with motol 800 at 40:1
Both my k5's run clean and fast.
Look here for how to set up your jetting:
http://www.oem-cycle.com/forum/viewtopic.php?f=5&t=109
Follow the directions there, start with your pilot jet first, then move on.
I'm guessing that you will be running leaner then me but go slow, and follow the directions, and check your plug color frequently.
reklessj:
When I was running straight VP WITH 60 pilot, 172 main, needle in middle, air screw 2&1/4 out. It ran tits and burned perfect should I go back with that setup maybe fatten up the air screw a lil
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