It's most likely a sticking throttle, throttle cable, or carb linkage. With the engine off, open the throttle all the way, then let go of it. It should snap back closed. If it doesn't, something is sticking.
Another quick question... when you say "doesn't drop off like it used to", do you mean that when you pull the clutch in to shift the rpms stay up, or that when you shift and let the clutch back out the rpms don't drop? Because that would be two different avenues of diagnosis...
when i pull in clutch and back off throttle rpm takes 2-3 seconds to drop off. i lubed both throttle cables with ACF 50(aircraft anti-corrosion tx)by injecting with a syringe and movement is very smooth. i can hear stops hitting in both directions. when i release throttle it snaps back very quickly. i purchased carb-sync kit from e-bay, followed video and they adjusted easily. what do i try next. thanks to all the replys.
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