Maintenance & Technical > KX500 Original
KX500 AF Running like a 200
Polar-Bus:
How does the engine sound when accelerating ? Does it sound deep burbly rich ? is the power flattening out in the midrange ? Your jetting seems to be in the ballpark of what most of us are running. Could be the dents in the pipe, but i've seen some nasty dents in a pipe and the engine will still run great.. Did your engine ever run 100% ?
FYI, I had the same exact engine symptoms right after doing a top end in my K5, long story short, I mis-timed the KIPS gears assembling my new top end.
RKPerformance:
I just got the bike so no it has never run "right" It does sound really burbly and smokes pretty good. The kips seems to be working by hand and opening and closing right. It was amazing how s**tty it would run when i put a 168 main in it. A 125 would run past me easily. Think i should try a 160 main if nothing else seems to be off with the bike?
RKPerformance:
I just measured the carb and it looks like it is a 40mm bored. Is it possible that the tight bend and pinch in the neck of the pipe is restricting exhaust so much that it isnt allowing the valves to open all the way? The pipe is filled with black slobber too.
lsampson:
The exhaust valves are regulated by a governor as I understand it, not exhaust pressure, so the kink in the pipe shouldn't affect the valve operation. However, if the pipe is kinked, it does increase backpressure which isn't good as it can greatly affect performance. You want some backpressure to keep intake gasses in the cylinder (rather than the exhaust), but not so much that it pushes intake gas back out of the cylinder.
Polar-Bus:
Idealy if you could bolt on a stock k5 pipe and try the bike that would approve or dissaprove speculations about the pipe being kinked and restricted..
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