Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
Motorrad:
--- Quote from: livenlife699 on March 15, 2011, 10:53:01 AM ---Where should I check for leaks? Only place I could begin to think is the airbox to airboot..I did seal it up but maybe Its leaking air..The bike sounds good until I give it full throttle it loads up but loads up less than it did with the 168.
--- End quote ---
Leak Down test.
livenlife699:
Allright well im going to look into that as i have never heard and will be playing with the bike over the next few days after work, I might end up just taking it back to my engine builder due to having the motor built before my chassis was ready so here I stand with a complete bike that runs 95% lol
livenlife699:
Can anybody help me out with a general point of reference on cleaning up my top end? Will going to a smaller pilot and in on the air screw help? I still have yet to get it 100% and am a little lost :/ I have a 175main with 58pilot on the 2nd clip from the top 40:1...
sniper1:
Just wanted to say that the graph is dead on for my setup and I thought it would be good for me to share my setup with everyone in case someone else has the same setup and needs to get their jetting right.
I have the gnarly pipe with boyeson 2 stage pro reeds (carbon fiber) with moose spacer on the carb side instead of against the jug I have a custom 8" pro circuit 304 silencer the bike has 14/47 stock gearing I run 94 octane fuel with amsoil 2 stroke oil.
I am in southwest michigan at 1200 feet above sea level and it's 80-90 degrees outside I mix my oil and gas at 32 to 1 because a properly jetted bike runs great at that mixture and runs at the right temperature in my experience.
I have a 165 main jet with the stock needle in the 3rd clip position or middle and a 58 pilot jet I tried a leaner pilot and it kept cutting out and running real hot and I tried the 60 and it was sluggish same with the main I tried the stock jet it was fat or rich and tried a 162 it was lean and ran hot so for this type of bike with these aftermarket mods this is the setup just like the graph says it should be.
165 main jet
stock needle middle or 3rd slot
58 pilot jet
amsoil synthetic mixed 32 to 1
58 pilot jet
amosil synthetic mixed 32 to 1
air screw out 1 3/4 turn
idle screw is turned out 4 or 5 turns and the bike idles perfectly nice slow idle
I should mention that I installed the boyeson 2 stage pro reeds in the stock reed block with sock reed stops because I've had rad valves and never liked that when hot it would get reed flutter at high rpm with no reed stops and it would even suck a reed when run real hard from time to time
I have instant throttle response from this bike and it pulls very hard all the way to max speed where it finally runs out of gear and the spark plug is a perfect chocolate milk color after a few throttle chops, I know that this is the way a 500 should run and this bike has the original stock engine and it's a 2002 model year so imagine how it would run with some engine work or even a fresh engine but I bought it from a older gentleman that was the original owner that is why I know it's the original engine.
Nice article
http://twostrokemilitia.jfn3.com/tech_articles.html
KevenW:
I'm new here and just bought an 03 and it's running awful! Surfing really bad and not clean at all. Haven't done any throttle chops yet. That seems to be key to proper jetting. Engine is stock, even the pipe. I'll update after some throttle chops when I get time.
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