engine idle question '83 GS450E

[catfishk]

i have set the engine idle on my '83 GS450E to 1100 RPMs via the idle adjuster between the carbs. sometimes when i am idling at a light the bike will hod idle at around 3K... then pop back down to 1100 after a few seconds.

even weirder, i SWEAR that i feel slight 'taps' through the bike's frame as the idle falls back down; one 'tap' and the idle moves from 3K to 2500 RPMs, quickly followed by a second 'tap' and the idle drops down to 1100 RPMs and stays put.

the bike has around 24K on the clock and runs great. i have been riding it about a month since replacing oodles of parts, and i am not sure of the history of the machine before my ownership.

[Steve]

Sounds like a classic case of bad o-rings on the intake tubes.


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[catfishk]

ok! i thoroughly enjoy taking all that airbox stuff off of there so i'll order up some parts and replace those pipes. looks like about $19 ea from bikebandit. thank you sir!

[Nessism]

Not the carb boots, the large O-rings between the head and the boots. Of course, replace the boots as well if they are hard and cracked.

[Steve]

I have not looked up your particular bike, but the o-rings are typically just under $2 each. As Nessism said, check the boots when you take them off. They should be soft and pliable. If they are hard, it won't be long before they are brittle, too.

Go ahead and get the new boots (if needed), then enjoy them until they go bad in another 24 years or so. 8-[


.

[fgh]

Could also be out of synch.

[catfishk]

i replaced the o-rings today. well, i think you *could* call them o-rings; they were more of a hard plastic ring that broke in pieces when i pryed them, unwillingly, out of their recesses. been a while, i believe

but the new ones are installed and the bike holds idle perfectly. thanks, as always

[chef1366]

I love it when someone heeds advice and then lets us know the results.
Way to go.\\/