Big Boy GTR250R idles but does not rev - Motorcycles

.As soon as I touch the throttle it will go to the sky.Have you any idea what that can be.Thanks. ... read more Doug E. Vintage M/C restorer Vocational, Technical or Trade Scho 2,485 satisfied customers1982 Honda Goldwing Aspencade: carburetor..bike..gas line..air filter I have a 1982 Honda Goldwing Aspencade, it has been sitting for about 2 years now, when I first got the bike I cleaned the carburetor, adjusted the valves, and did a oil change, I also cleaned the gas ... read more Doug E. Vintage M/C restorer Vocational, Technical or Trade Scho 2,485 satisfied customersI have a 1982 Goldwing GL1100. I have replaced the carburetor I have a 1982 Goldwing GL1100. I have replaced the carburetor diaphragms, the pilot jets, and the idle mixture screws. I have cleaned the carburetors. I have adjusted the valves. I have rebuilt the petcoc ... read more Doug E. Vintage M/C restorer Vocational, Technical or Trade Scho 2,485 satisfied customers1982 GL1100: carburetor..The bike idles fine

Choke On: Pulled All The Way Out
1/2 Choke: Halfway Out
No Choke: Pushed In Totally (Against Carb)

As far as your idle goes, look for a bigger bolt /screw that has a spring behind it that holds tension on the screw to mai rain the idle speed at which you stop adjusting it, you should be able to turn this easily by hand and just go slowly and you'll hear the engine rev up/down so don't worry it's simple! You can use a socket/wrench or screwdriver if necessary as most have a Phillips head pattern on the of the bolt's head. Turning it in(toward carburetor body) should make idle speed increase while screwing out will slow the idle speed down(if it's not just like that in yours it's the opposite but should be like this as most are).

Nearly all carburetors are just like this.

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Check leakage in manifold or some big size vacuum pipe like the ones connected to the brake booster or servo.

If you have an aftermarket exhaust fitted this could be normal, It depends on the range of the change in revs. 50 or 100 revs up or down at idle is no big deal.

CLEAN THE JETS AND HAVE THE CARBS SYNCED THAT SHOULD FIX IT

A big vacuum leak will do this it can be from a open PCV valve sticking open EGR valve to a sticking a IAC (idle air control valve) sticking open. You basically have something get stuck and closing.

the thottle slide can be sticking, a rich mizture gives similar symtoms

You need some new head gaskets, my friend. Or you have a cracked head... either one = BIG BUCKS. bummer.