Maintenance & Technical > KX500 Original

pressure/vacuum test?

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Toom038:
Does anyone know what pressure and/or vacuum I should use to test a 500 motor? I have a '99 that I can't get jetted right. I want to eliminate all other issues before I go postal on this carb and put a new one on it. I'm at a 180 main, 52 pilot and stock needle at 4th clip from top and it still blubbers off the bottom. Floats are set at 16mm and I put a rebuild kit in the carb. Seems fat on the bottom and then hits hard at upper mid. I'm right at sea level, running 50/1 93 pump gas. Is there something else I could be missing? Thanks in advance.

sandblaster:
Should hold 7lb positive and negative pressure overnight.
Thank Yodarad for the info :-)

joko:
 I tried a 2" expansion plug in the exhaust port to seal it. It was a little too small by about .080", so I wrapped electrical tape around the rubber OD and put it in. It still leaked, when I checked it with soapy water, I think the grooves in the exhaust port from the pipe contributed to the leaking, but couldn't get it to seal after many attempts. Anyone have a better plug solution?

Gage:
wait I know this one  :-D http://www.kxriders.com/forums/index.php/topic,11497.15.html The Mity vac worked really great for this too. http://www.amazon.com/Silverline-Elite-Hand-Vacuum-Pressure/dp/B004BYGSJI/ref=sr_1_10?ie=UTF8&qid=1372736900&sr=8-10&keywords=mityvac

sandblaster:
I'm wondering... Since it only has to hold 7lb have you tried some black RTV?

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