Maintenance & Technical > Kx Frankensteins
YZX500 Project
scottysg:
--- Quote from: Motorrad on February 25, 2016, 04:06:46 AM ---It's not the needle that is the problem... It's the tube that it goes up and down in... It is a jet. , and when the needle wears it out it makes it impossible to get fueling right....
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Motorrad I see now what you mean. I hadn't even thought that could happen. Ill take a look at it and see how loose the needle looks in there.
--- Quote from: Foxx4Beaver on February 25, 2016, 04:08:42 AM ---
--- Quote from: scottysg on February 25, 2016, 03:46:30 AM ---I checked kips while running and the arm is moving like it should. Looking into the exhaust, the ports seem to line up right when its moved, so I'm fairly confident kips is not the issue. however I am new to kips.
Thank you,
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this probably isn't the culprit...but,
did you happen to notice if the center "flapper valve", at the top of the exhaust port was opening fully as well, when you were checking the side valves?
over time the pins get worn and that valve won't function fully....in other words, if that center "flapper valve" can't open fully...it'll choke itself to some extent under full throttle because the exhaust port opening will be to small.
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This engine only has the 2 barrels, theres no center valve.
Thank you,
Foxx4Beaver:
my bad...chalk that up to me not paying attention. :lol:
Motorrad:
Not sure why. But I've seen more k5's with the worn needle valve than other modernish bikes....... Now old bultacos... Don't get me started...
scottysg:
--- Quote from: Motorrad on February 25, 2016, 05:07:46 AM ---Not sure why. But I've seen more k5's with the worn needle valve than other modernish bikes....... Now old bultacos... Don't get me started...
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Its clearly because there is so much fuel gushing through to the massive engine. Its natural erosion like the grand canyon except it only takes years not millions of years. :p
scottysg:
The needle jet looks pretty good, but I can't say I know what Im looking for.
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