I recently got a new top end and now my bike is running too rich. It is a 99 KX 500. It runs great but smokes a ton and a new spark plug will be black after one ride. I checked out the jetting chart to see what is recommended. So I took my carb off to see what I was running. Maybe I am reading the jets wrong but the number seem to be way off compared to the chart.
The needle is right with an N82M. It was on the 3rd clip so I moved it to the 4th. Didn't seem to make a difference.
The Main jet has what looks like a check mark and then a 48. Maybe the check mark is supposed to be a 1.
The Pilot jet is 85.
I have the air screw at 1-1/2 out.
I am not experienced with this at all but those numbers don't even seem to be in the ball park. Everything is stock except for the new wiseco piston.
I run 91 octane pump gas at 32:1. And I am at 5000 ft. Any suggestions? Thanks
Are you kidding me a #85 pilot
?!!!! How the hell does that 500 even start let alone run without immediately wet fouling the sparkplug ? That is SO pig rich, no wonder the bike smokes so much. I normally don't like to give out my jetting but in this peticular case I will. Keep in mind my jetting should get you in the ballpark, I am NO jetting guru, but my 500 runs perfect with this jetting. You might need to fine tune a tad richer or leaner to compensate for air temps. This should be a decent baseline for temps around 65F. Try this :
#165 main
#55 pilot
stock needle in clip pos #3
air screw 2 turns out from closed
If after this your 500 still runs bad you need to do a compression test. Make sure your compression is up around 160 psi . DON'T "assume" because you have a new top end that the compression is good.