Maintenance & Technical > KX500 Original
1983 KX500 for $400-should I buy????
ibpassngas:
i have a 1983 KX500 and it does the same thing. Starts and idles fine. After 1/4 throttle it just bogs and will not rev. I'm guessing the carb is messed up. My carb is not the stock 1983 round slide Mikuni. Mine has the flat slide VM38 (like the 1984 KX500) but this carb has some adjuster mechanism on the top that runs down the length of the slide. Probably off a different brand/model or snowmobile.
If anyone can let me know if they think it's carb related I'd appreciate it.
However, I do have the 1983 manual and the stock carb settings and corrected ones are posted here: http://vmx.livewire.gen.nz/magazine/83KX500/83KX500.htm
thanks
73G5100:
--- Quote from: ibpassngas on December 26, 2008, 10:14:36 PM ---i have a 1983 KX500 and it does the same thing. Starts and idles fine. After 1/4 throttle it just bogs and will not rev. I'm guessing the carb is messed up. My carb is not the stock 1983 round slide Mikuni. Mine has the flat slide VM38 (like the 1984 KX500) but this carb has some adjuster mechanism on the top that runs down the length of the slide. Probably off a different brand/model or snowmobile.
If anyone can let me know if they think it's carb related I'd appreciate it.
However, I do have the 1983 manual and the stock carb settings and corrected ones are posted here: http://vmx.livewire.gen.nz/magazine/83KX500/83KX500.htm
thanks
--- End quote ---
It sounds like your carbs dirty. Check your main jet for blockage. Also check floats.
I have a 1984 KX500. It has a flat slide Mikuni VM38SS carb on it. The carb has a 320 main jet and a 70 pilot jet. The bike runs good but slightly rich. From the time I bought it new from the dealer it has never idled. This carb has no way to adjust the slide opening for idleing. It just has an air screw that starts at 1 1/2 turns out. It almost idles best at that setting. I changed the pilot jet a few times when it was new, but always end up putting the 70 back in. I'm not messing with the jets cause it ran good enough to smoke the old 84 CRs and it never seized.
ibpassngas:
Thanks 73G5100 for the jet specs. I think you're right -- carb. I checked all electrical items and they passed. I will work on it. The main is a wimpy 155.
I added some pictures of the bike to my gallery (ibpassngas). Hope this link works.
http://www.kxriders.com/coppermine/index.php?cat=11633
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