Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
KXcam22:
Gowen,
Your bike is a '90 right? The R1366N is an OEM number, its likely that Kaw used this number before switching to the N82M type numbers that are stock in my '92. It's possible they are the same but hard to tell. The R1366N works out to a Keihin CGG. Check out sudco.com catalog under the N, they have a listing for Keihin PWK39 needles. That R number sounds a lot like the one in my old '87 CR500 (same carb). Is there any chance your needle is not stock? If you can't confirm it, it may be prudent to buy a N82M stock needle as a starting point. I think my old CR had a R1366N and it used a 40 pilot. It must be a hastle to not have a good jetting place. Any rural gravel roads in your area? Take a few runs then take off before any heat arrives. I can post the list of '92 option needles from my manual if you need it. Cam.
gowen:
Hi Cam, it's funny, I just got off the phone with Sudco. :-) I told them I need a larger diameter to lean out the 1/8-1/4 throttle. Hopefully not effect the mid-top range. The person at Sudco was very helpful in helping me design a needle that would work in the direction I led him. So, I ordered 3 needles, one a step leaner, one another step leaner, and one two steps further. Just incase. I also ordered a 40 and 38 pilot along with a 158 main. All ended up not being much over $20! Which is down right amazing, so I overnighted it, so I would have it by the weekend. I'll let you guys know how it works out. I'm assuming this will work. I hope so.
KXcam22:
Gowen,
Glad that they were lots of help. This was years ago, but I once put a 38 mikuni (I found it) on my maico race bike. I phoned sudco and they told me the exact jetting I needed (what they sold as their maico carb kit) over the phone. Worked perfect first time. Just for info what letter needles did you get? Cam.
kawdude:
--- Quote from: gowen ---
Btw, it is a spark knock from either the bike running too hot or the fuel not buring correctly (too rich usally), sometimes the timing off, in this case it sounds like a fuel issue (directly related to jetting) Anyway your engine would only be at stake cause it is a lean mixture.
Thanks for the help guys.
--- End quote ---
Interesting. The bike wasn't hot but the timing could have moved, I'll check that. If I remember correctly, it knocked at 2nd clip, 52 slowjet and surged terribly. Removed the idle surging by cranking the air screw in thus removing air and making it richer. I think I'm a half turn out. Doesn't this "half turn out" say that the slowjet is too small? Also, wouldn't idle real well so cranked the idle screw in. I'm won't argue but why would the engine knock if rich? Maybe knocking is a not good term...how about aluminum rattling quickly against aluminum.
d**nit, I have to read my previous post so I know what I did. :roll:
A little off topic but thumpertalk has good prices on jets and seem to carry all the sizes. I'll be interested in how the Sudco stuff works. Thanks again.
kawdude:
--- Quote from: KXcam22 --- An easy method I use to set mine is to (with the carb on the bench) put a piece of spare fuel line on and blow (used fuel line tastes bad) into it while tipping the carb back with the float pivot pointed up. When the air flow stops, that is your float level.
--- End quote ---
JFC! That's a great idea! So simple... :idea:
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