high revs

[GZ250]

for sometime like a week i am experiencing that when i come to a stop the engine keeps going on at high rev (not very high) but i can feel that it takes like few seconds when it comes to normal (rev) speed. I have oiled the cable and it is not sticking. Is something sticking in the carb? where to start to find the fault.

Please suggest. Thanks.

[Moedad]

Does it do it after the engine is good and warmed up? I'm no GZ mechanic, but choke cable lubrication or idle setting might be a couple of things to play with. Check and make sure your fuel valve is not set on "PRIME" too. Try running some Berryman's 12 through a tank of gas. That about exhausts the things I know to check.

[GZ250]

yes it happens when the bike is warmed up and hot. choke seems to be ok because when i close the choke initially the revs go down and idle setting is also not very high where the engine seems to be running high. otherwise i do not feel any thing wrong, the clutch is working fine and bike is running good. i am using the a carb treatment additive. i looked the berryman site but how do we buy that because it does not sell or any anything.

Thanks for the reply.

[Easy Rider]

Originally Posted by GZ250

i am using the a carb treatment additive.

Which one? One at a time, please!

This could be a sign of a vacuum leak. Check the air filter element to be sure it is not loose or otherwise damaged. Check the rubber boot between the carb and engine.
And, believe it or not, the drain tube coming from the bottom of the air box MUST have the plug in place. If not, this effectively makes a vacuum leak and might cause your problem.

Also need to be sure there is some slack in the throttle cables; no slack can mean a subtle sticking that is hard to notice. Same thing for pinched or kinked throttle cables.

[patrick_777]

Have you adjusted the idle speed?

[Easy Rider]

Originally Posted by patrick_777

Have you adjusted the idle speed?

IIRC, he says it drops back to "normal" on it's own after a few seconds:
" i can feel that it takes like few seconds when it comes to normal (rev) speed."

I guess this could mean that the idle speed is set WAY too low.......but I doubt it.

[Canuck]

I had that problem when my Enricher circuit cable was reinstalled infront of the Front Left signal

it was yanking on the cable when i would push the left handle bar forward causing the enricher circuit to open or (choke)

maybe that helps??

[jonathan180iq]

So, as you come to a stop after riding the revs stay high for a bit before dropping back down to normal?

If that's the case, this is a sympton of having a lean mixture. I would suspect a vaccum hose has come loose somewhere. Most of them aren't held in place by anything other than friction. Check all of your little rubber hoses and make sure they are properly attached to something.

[GZ250]

Still the same issue. The idle speed is ok because it idles ok. no leaks that i can find and rubber boot is ok, tight and fix in its place. the air filter element is good (only smells gas), the plug on drain tube is there. i did not remove the cable but looks ok. now i lubed again. fuel valve is at its normal place. and i used once the GUMOUT additive bought from walmart and its the first time. previously i have been using the Suzuki brands. did NO adjustments or changes to anything. Just an oil change but after that it was ok.

i also feel that for a couple of fill ups i am getting less mpg (63) than i used to get (65-67).

Thanks to all.

[michaelp]

Thanks for the chatter. I was having a similar problem but mine did not return to normal after a few seconds of idling. I adjusted the idle and that seems to have fixed it.

Question: Does the idle adjustment tend to move on its own over time