Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
SHLEPY:
Depends on the girth of the jet.
sandblaster:
--- Quote from: Motorrad on April 05, 2013, 04:52:07 PM ---given....... I havnt read MOST of this thread. but I havnt seen anyone discuss how premix viscosity affects jetting... :roll:
--- End quote ---
Or lubricity.....
motopunk:
i run at all my green 2 stroke monsters 40 : 1 mix (only motul)
i tried in the first 32 : 1 and came more oil than smoke out of exhaust. (this rich mix i only use at new or complete rebuilded engines. 1 or 2 tank fillings than back to 40 : 1.)
some guys ride 50 : 1 . ktm says in manual book up to 60 : 1 for 250cc -380cc motors. maico and zabel (sidecar motors based on maico 500) says up to 100 : 1 mix for the 500cc - 700cc motors with their special oil ..
but i think i´m on the safe side with 40 : 1 mix. engine runs clear. piston look always like fresh installed, when i pull cylinder. :-)
its a simple rule: less oil in the mix = more effective power from the gas. but never take too lean mix or cheap bad oil, that will risking engine damage that one!! :|
Friar-Tuck:
Something like that,
When you increase the mix ratio
(reduce the amount of oil mixed in the gas) this makes the engine run richer.
You will have "more" gas and "less" oil going through your carb at any given time.
Anytime the oil ratio is changed, the carb jetting should be adjusted.
The same holds true when you decrease the mix ratio (increase the amount of oil mixed in the gas).
Increasing the amount the amount of oil will make your engine run leaner, if you add too much oil you run the risk of engine damage if you don't re-jet the carb.
Of course, you could adjust the mix to compensate for jetting issues. Most guys adjust their jetting to the riding conditions.
Tuck\o/
motopunk:
correctly... :-)
and I always say first take the right mix to ride in the tank, then you can start fine tuning and jetting. at least it is a good bike .. all my bikes start at 2 -3 kicks.
with my KX500 was a really hard way to find the correct jetting. as i started the project I had only individual parts. I bought the engine with ignition and mikuni carb, but there were no jets, needle and slide in it. on ebay I found a keihin pwk 39, I drilled it up to 40mm. then at my kawasaki dealer I found in the spare parts lists which stock needle is used in the kx500E-models. then I had to do in 2 long weeks to find the correct pilot and main jet and needle clip position.
then I found kx riders.com and i saw i was exactly on the right way. I can only say it again and again, great web site :-D
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