Maintenance & Technical > KX500 Original

Black gunk

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cattamer:
I have a '92 500,when I bought it I noticed it had alot of black oil residue on front of motor and exhaust, and had even blown out on side panel and swingarm.The guy I bought it from didn't know much about bikes'and so I thought oil/gas mixture to rich.I owned a '90 and it never did this.This one has a stealy flywheel weight,and Knarly pipe, but doesn't have the bottom end that my other had.It doesn,t foul plugs,and starts easily.It seems to want to jump off bottom end more than the '90.Is this caused by KIPS,or something else.Still love my big-bore gas gusler,climbed hill yesterday while 4-bangers watched! :?

martinfan30:
If you have black splooge coming out at the head pipe, your jetting is off. The jetting is keeping the cylinder temps from getting hot enough to burn off the oil in the premix.

atrain40:
i have a 1991 that i just bought and i mix the gas at 32:1 but am gonna change it to 40:1 or 44:1 because of so much splooge coming from exhaust port on front of motor. and bike runs great. it has procircuit exhaust front and back and he said the jetting is set up the way procircuit has it. i live in bakersfield CA and mainly ride in the dez and sometimes mountains jetting help please.

cattamer:
Thanks,Martinfan30,I will pick up a kit and try some different settings.I am in SC and probably about 8 or 9 hundred feet above sea level,do you know what needle setting to run or do I just need to experiment?

cbxracer30:
I've seen this alot on bikes that I bought used with the former owner running cheap 2stroke oil at 32 to 1 . The first thing I would do is take the pipe and silencer off and clean them out , change the silencer packing and rejet for 50 to 1 . For trail riding I like running Belray SI-7 its smokeless and for racing I'm gonna start running Motorex 2T racing if its good for the big teams oh yea and Roostdaddy its good enough for me. CBX

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