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Old 06-28-2007, 03:22 PM   #1
jus10
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KX80 Jetting

I'm re-jetting my kx80 (it's way off) and was wondering if any of you running a kx60 or 80 could tell me how many turns out you have your jetting needle set at. (The carb is after market, but this way I can get a ball park area for where I need to start.) I run about 32:1 mix if that helps. Thanks.
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Old 06-28-2007, 03:24 PM   #2
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DO YOU HAVE A PIPE ON IT?
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Old 06-28-2007, 03:25 PM   #3
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fmfracing has a chart on their site for stock and piped jetting requirements..
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Old 06-28-2007, 03:26 PM   #4
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Quote:
Originally Posted by CarbonR1
fmfracing has a chart on their site for stock and piped jetting requirements..
yeah, I have an FMF pipe and silencer on it...

Thanks James.
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Old 06-28-2007, 03:30 PM   #5
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James can you dumb this down for me? what does the 125 mean on "main jet"? and the 3rd position on the needle?

Jetting Information
Main Jet: 125
Pilot Jet: N/A
Needle: STOCK
Needle Position: 3RD
Power Jet: N/A
Air Screw: 1.5
Fuel Screw: N/A
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Old 06-28-2007, 03:46 PM   #6
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Old 06-28-2007, 03:51 PM   #7
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you may not even need to change out the main jet. our stock needle is the proper size from the factory to run with our pipe.
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Old 06-28-2007, 03:51 PM   #8
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Needle: 3rd

Some needles have circlips that can be moved into a different position to change the mixture.

example:
carb needle
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Old 06-28-2007, 03:57 PM   #9
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wow...got real dumb there for me, thanks!
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Old 06-28-2007, 03:59 PM   #10
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Quote:
Originally Posted by CarbonR1
you may not even need to change out the main jet. our stock needle is the proper size from the factory to run with our pipe.
yeah, the main jet has been in there, and I haven't done any mods recently, so I'm leaving it alone.
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Old 06-28-2007, 03:59 PM   #11
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Quote:
Originally Posted by jus10
I'm re-jetting my kx80 (it's way off) and was wondering if any of you running a kx60 or 80 could tell me how many turns out you have your jetting needle set at. (The carb is after market, but this way I can get a ball park area for where I need to start.) I run about 32:1 mix if that helps. Thanks.
what is it doing? A way to tell if it is lean is:
in third gear about mid range, roll to full throttle, when you are at full throttle, let off just a bit, if it goes faster 3/4 throttle than full, it is lean(99.9% of the time)
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Old 06-28-2007, 04:00 PM   #12
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Thank you very much fellas! Saved me a bit of time and headache.
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Old 06-28-2007, 04:02 PM   #13
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Quote:
Originally Posted by josh302
what is it doing? A way to tell if it is lean is:
in third gear about mid range, roll to full throttle, when you are at full throttle, let off just a bit, if it goes faster 3/4 throttle than full, it is lean(99.9% of the time)
REEEEEEEEAL sluggish (bogs) until it hits the powerband. Once in the powerband, it screams and throttle response is pretty instant.
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Old 06-28-2007, 04:05 PM   #14
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thats all pipe and reeds and gearing. try the full to 3/4 test and see if its lean, if not lean, and it runs good, leave the carb alone.
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Old 06-28-2007, 04:10 PM   #15
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Quote:
Originally Posted by josh302
thats all pipe and reeds and gearing. try the full to 3/4 test and see if its lean, if not lean, and it runs good, leave the carb alone.
I've done that, just cruising then open it up and it goes without hesitation...

I'm thinking it's either the carb or the reeds. The gearing is the same and it never had issues. The carb got rebuilt and fuct with so the air screw is off for sure, but I'm not sure about the needle position. I'm hoping it's the carb and checking it first, but we'll see. How long do reeds normally last?
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Old 06-28-2007, 04:24 PM   #16
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post up a pic of the spark plug, we'll tell you how it's running
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Old 06-28-2007, 04:26 PM   #17
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Quote:
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post up a pic of the spark plug, we'll tell you how it's running
fair enough....you'll have to give me a few hours though.
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