rpms wont drop need somme ideas

so when i let off the throttle my rms are not dropping and i can visually see the the carbs are fully closed when the throttle is released. ive torn them apart and cleaned them but they still are doing it. any ideas and help would be appreciated.

2 questions -

Are the rpm high even when you first start the engine?
Does the throttle stop knob lower the rpm if you turn it counter-clockwise?

Ed

at idle and when starting its fine as long as i dont pull the rpms past 4k. ive had the tank off and the cable free and clear so nothing is pinching it and sprayed some lube down it. the throttle stop knob? basically just used to control idle? but yes when i turn it it will lower rpms.

OK, so far - so good. Yes, the throttle stop normally is used to adjust the idle speed.

If you haven't done so, I would check the carb holders for leaks. They eventually will develop tiny cracks in the mating surfaces between the holders and the cylinder head and cause poor idle. These cracks cannot be seen with the carb holders in place. I suggest you try the following. Get the engine warmed up and temporarily set the idle as low as possible without killing the engine. The lower the better (certainly below 1000 rpm) because with the idle very low the slides are about shut and the vacuum inside the carb holders is at its highest. Then spray carb cleaner around the carb holders, especially where they mate with the cylinder head and where the carbs attach to them. If the engine dies or seems to react to the carb cleaner, you need to replace the carb holders.

If that is the case, before you even try to remove the carb holders screws soak them for a couple days with Kroil. Otherwise you may strip or break them as many on this forum have done.

Another possibility is that the timing advancer is sticking and slow to return to the normal advance level when the rpm varies from high to low. This can be corrected by cleaning and lubing the advance mechanism. Ed

Had the same problem. Cleaned up the advancer and retimed. Go now.

yea i tried checking for leaks the other day and it didnt cause any change when i sprayed them buut i am ordering new ones today just in case. but i will deff try and do the timing advance tomorrow thanks for the help and ill post again if there is no change.

I had the same problem. As soo as I cracked the throttle it would hang up. If I leg the clutch out a bit with the brake on in gear it would drop the idle back down.
Solution : disassembled the entire timing advancer, cleaned, lubed the hell out of it and reassembled.
It has worked great ever since.

yea thats basically what i have to do. deff going to take a look at that tomorrow.

so took the timing advance off and cleaned it and lubed it and reset it but it did not fix the problem. think im going to take the carbs back apart and completly rebuild them. any places where i can get the parts seperetly as i dont need the jets since mine are only like 2 months old. basically just need the need gaskets springs those parts

Before you pull the carbs there's one more thing you may want to try. Disconnect the throttle cables at the carbs then start the bike and give it some revs by manipulating throttle at the carbs. This will totally eliminate any possibility of a cable issue. If the revs still stay high you can at least eliminate the cables as a suspect. If the revs drop to normal, there's a cable or throttle grip issue. What the heck, if you're going to pull the carbs you'll need to disconnect the cables anyway, so it's worth a try. Ed

yea that was on of the first things i tried to do, but thanks for all the help if the new holders and rebuilding the carbs dont work lol ill be back on here lol

im still having rpms staying way high when i pull the clutch in changing gears...only time they go down is switching the gear and letting out the clutch??? :blink: