Maintenance & Technical > KX500 Original
KX 500 Flat on Mid and top end
motopunk:
--- Quote from: sandblaster on April 07, 2013, 03:05:57 PM ---Man, that thing is crisp....
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the sound of a perfekt 2 stroke motor... :-D
lsampson:
Motorad, after listening to that clip, it is the same sound, but mine is louder, and I only noticed it after the rebuild, which i suspect is because I switched from a stock to a wiseco piston. I am not sure what to do. The rattle annoys me, so I'm leaning on replacing the new wiseco with a new OEM piston and rings. Is there any chance that when I cleaned up the exhaust valves I gave them more slop and they are whats rattling? What would you guys do?
Motorrad:
--- Quote from: lsampson on April 08, 2013, 01:27:04 AM ---Motorad, after listening to that clip, it is the same sound, but mine is louder, and I only noticed it after the rebuild, which i suspect is because I switched from a stock to a wiseco piston. I am not sure what to do. The rattle annoys me, so I'm leaning on replacing the new wiseco with a new OEM piston and rings. Is there any chance that when I cleaned up the exhaust valves I gave them more slop and they are whats rattling? What would you guys do?
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the clean valves will rattle.
if its the same sound as the video. its not piston. (there is no piston to be heard in that video). that is 100% kips ratte.
Mine is quieter than most due to all the work I have done to them.
lsampson:
what kind of work can I do to quiet mine down? The valves seem good (no excessive wear), but I can move the center valve flapper up and down with the exhaust pipe off. Is that where the rattle is? Do you guys typically use OEM pistons? I just don't want to pass it off as ok and have to rebuild the top and bottom end of the bike because I messed something up :?
Motorrad:
--- Quote from: lsampson on April 08, 2013, 05:17:20 AM ---Do you guys typically use OEM pistons?:?
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That is a hotly debated topic depending on who you ask.
ask me. Forged only goes back in my bikes.
--- Quote from: lsampson on April 08, 2013, 05:17:20 AM ---what kind of work can I do to quiet mine down? The valves seem good (no excessive wear), but I can move the center valve flapper up and down with the exhaust pipe off. Is that where the rattle is? :?
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when you say you can move it up and down... how much we talking? 6" or ?
do you have any tension on the kips acuator rod (via the kips arm) ? there should be some tension on the system.
There is lots of work that can be done mine for example, are Re-shaped on the flow areas, the ramp angle is messed with on mine., roughly .030" taken off the top's to pull them higher in the cyl, and everything is shimmed to perfection.. kips acuator rod re-cut, run a differant kips arm for better leverage and ratio for kips bolt mod, as well as a "messed with" kips drum (spring shim stack etc))... Im sure somone will post a link to my motor thread. :roll:
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