Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
stujordan:
Does turning the air screw all the way in disable the pilot jet effectively?
In other words will the only gas air provided to the engine come from the main and the slide?
Want to test the main and needle only....will that work?
Foxx4Beaver:
--- Quote from: stujordan on August 11, 2014, 06:25:41 AM ---Does turning the air screw all the way in disable the pilot jet effectively?
In other words will the only gas air provided to the engine come from the main and the slide?
Want to test the main and needle only....will that work?
--- End quote ---
read this thread...more so, the part that Sandblaster has posted...excellent detail.
http://www.kxriders.com/forums/index.php/topic,10910.0.html
Foxx4Beaver:
--- Quote from: stujordan on August 10, 2014, 11:08:01 PM ---The mid and top feel flatter than before too....use to hit like a freight train....now it feels mild.
--- End quote ---
get that 150 main outa there and swap it for a 168....then report back :wink:
stujordan:
Well....the excess oil drained off the air filter in the last 24 hours....Widow Maker is back to her old self...
In fact she is pulling a tad harder down low than ever before...so much so I cant work up the courage to go WOT :( the small amount of surging is back, but not horrible...
I saw a video that says when the -fuel screw- (ie...idle screw) is turned all the way in it effectively shuts the pilot jet OFF! Meaning the pilot jet will contribute zero fuel at all throttle positions....
Has anyone run their bikes with the screw all the way in?
motopunk:
--- Quote from: stujordan on August 11, 2014, 06:25:41 AM ---Does turning the air screw all the way in disable the pilot jet effectively?
In other words will the only gas air provided to the engine come from the main and the slide?
Want to test the main and needle only....will that work?
--- End quote ---
this is how a carb works.. pilot jet: from idle to 1/4 throttle turn. needle from 1/4 to 3/4 .. at full open: main jet only .
any turns on the airscrew effects only the pilot jet. is the screw 2,5 -3 turns out you need the next richer pilot jet. by less than 1 - 0,5 turns the next leaner pilot size.
the needle does the main work in performance.. by to rich you have to lowering the needle to get in leaner position.
if the needle has reached the highest clip-position, and engine is still to rich, you need next leaner needle. (example: n82m is in, then comes n82n )
has the needle reached the richest position (lowest clip position) and is still to lean, comes the next richer needle (in this szenario the n82L )...
by changing main jet never go bigger as 5er steps ... example: 170 is in and to rich you could try the 165 to get leaner or 175 for the other case of to lean.
do always test one of this things to come step by step to the perfect jetting.
always with warm engine, and in the conditions,where the bike should used.
make also sure that the airfilter is clean and oiled in the right way and also that the right gas is in the tank best premix is 1:40 with motul 800. in my eyes the best 2stroke-oil thats available to the public.
i ride only 98 or 100 octane (called super-plus here in germany)
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