Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
alexander-vmann:
Im looking for a starting point, i want to switch to 32:1 becuse i heard this will help with sealing the piston rings better, im hoping this can help with the scratches that are on the front wall of the cylinder, i supsect fuel might leak past the rings, but i doubt it, at least i want to make sure the scratches dont get worse until i can fix it, anyways i want to use 32:1 on 98 octane fuel (norwegian/european rating) im at sea level, temprature is between 10 to 25 celius, my engine is a 1987 mod but the carb is a 1993 mod,
dave916:
https://www.revzilla.com/assets/0000/9709/fmf_gold_series_gnarly_pipe_kawasaki_kx50019882004.pdf
1988 jetting would be a good safe starting point {only year with same case volume}/ stock needle 1368n/ 175/ 62
87/ 88 should in theory require richest jetting due to bigger case volume
Say that i am running 160main/50pilot on a 88 but the has been blueprinted /modified inlet/differant header lenght on exhaust/ reduced case volume/
Things can vary so much from motor to motor
alexander-vmann:
--- Quote from: dave916 on May 20, 2017, 08:42:19 PM ---https://www.revzilla.com/assets/0000/9709/fmf_gold_series_gnarly_pipe_kawasaki_kx50019882004.pdf
1988 jetting would be a good safe starting point {only year with same case volume}/ stock needle 1368n/ 175/ 62
87/ 88 should in theory require richest jetting due to bigger case volume
Say that i am running 160main/50pilot on a 88 but the has been blueprinted /modified inlet/differant header lenght on exhaust/ reduced case volume/
Things can vary so much from motor to motor
Mine seems to always be running rich even on stock 1993 jetting, (lots of smoke and oil in the exhaust)
--- End quote ---
dave916:
double check the choke circuit
Could be a carb problem , I have a pwk carb that seem to run crazy rich {like if the choke is on} even though i have triple checked everthing, I ended up swapping it for another one
alexander-vmann:
--- Quote from: dave916 on May 21, 2017, 03:25:22 AM ---double check the choke circuit
Could be a carb problem , I have a pwk carb that seem to run crazy rich {like if the choke is on} even though i have triple checked everthing, I ended up swapping it for another one
--- End quote ---
i have installed a new choke, maybe i got it wrong somehow, i put in a 165 main and 55 pilot, set the airscrew when the bike was running and ran a little test, the bike was scary powerfull and ran so strong i didnt dare use full throtle, but my dad say that it was smoking alot? Im running at 32:1 but i still dont think it should be smoking tjis much, there is also alot of oil in the exhaust so i think a cylinder hoon and repair is needed, anyways, i think its pinging? Does anyone have a video of a bike pinging so i can compare the sounds?
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