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Bike set for a year now no fuel at idle to rear carb

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Time to clean the carburetors . The alcohol laced fuel that the government dictates is full employement for mechanics. This alcohol absorbs water and mixes with the gunk in your tank and then gets to your carburetors where the alcohol evaporates and leaves gunk in the orifices.This blocks fuel flow. I have put off cleaning mine for six months but must get to it.

Posted on Apr 04, 2011


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Posted on Feb 01, 2011

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Factory carb settings

This can vary from year to year, model to model, and make to make. A service manual for your specific bike may shed some light on what the default settings are on your carbs. Sometimes a simple search on your year make and model of bike with carb adjustments can return the answer to your question. Here is an example: 1979 Honda CB750 Carb Adjustments. One other factor in this is the elevation you are at. At higher elevations the air is thinner making your bike run rich as there isn't enough oxygen to mix with the fuel. Once you know where your adjustments are, you can get them fairly close by slowly adjusting them with the bike idling. You want to turn slowly (1/8 turn at a time) until you hear the motor idle increase. For multiple carbs, start with one and repeat on all other carbs. If you continue to turn your jets after the idle increases, it will eventually start idling down again. I have been taught to try to find the boundaries going each way and seek the middle ground. Once this is performed on all carbs, you may need to adjust your throttle stop adjustment screw to bring yoyr idle back to specification. Good luck with your carbs, safe and happy riding to you.

Oct 15, 2013 | Suzuki Motorcycles

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Won't Idle at stop signs.

could be as simple as idle speed adjustment. screw located on r/h side near rear carb. almost directly behind ignition switch but on opposite side of bike. If bike has had a history of sitting up however it may need a proper carb/ fuel system cleaning and synchronization to perform correctly.

May 23, 2013 | 1993 Suzuki VS 1400 Intruder

1 Answer

1983 kawaski kz1100 spectre high idle to keep running

When a bike is run you get a small build up of rubbish in the carbs, this can block the idle jets. So a carb clean should solve your problem. Nice to see older bike still being used. Beware of mad "cagers" and keep it rubber side down.

Dec 17, 2011 | Motorcycles

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1983 kawaski kz100 spectre high idle to keep running

Have you cleaned the tank, fuel can cause steel to rust, drain carbs and blow the jets out. Then make sure you change (or fit) the in line fuel filter, they are cheap and easy to replace and save problems like this.

Dec 17, 2011 | Motorcycles

1 Answer

Bike stalls when slowing down at stops and turns starts right up.

Well you didn't say what year or model bike it is or whether it's fuel injected or equipped with a carb. If it's equipped with a carb, you may just need to set the engine idle speed a bit higher. If this is the case, the throttle stop screw that sets the engine speed in at the top right of the carb. You may have to take the air filter cover off. Clockwise rotation of the screw increases the idle speed. Set the idle speed at about 1000 RPM with the engine at full operating tempature.

Good Luck

Jun 29, 2011 | Harley Davidson Multistada 620 Dark...

1 Answer

Bike is back firing and bogging down when I get on the throttle. Need to know how to adjust carb.

Before adjusting the carb, has the bike been setting for a long period of time? Has anything been done to the bike that would change carb settings? If it's been setting, there is probably a gum build-up in the jets and fuel passages. If it sat all winter, my solution is to add 1/2 can of SeaFoam to the gas, lock down the front brake and rock the bike back and forth mixing the fuel and additive well. Start the bike and run at a high idle until engine temp is normal. Shut it down and let set for an hour or two, allowing the mixture to work in the carbs. Restart and run at high idle again. If it seems to clear up somewhat, ride the bike several miles to check if it worked.

Apr 15, 2011 | 1999 kawasaki VN 1500 Vulcan Classic

1 Answer

On my honda goldwing gl1100 the RPM goes eratic. the rpm goes up and down from .07 to 1.3. I was told that the carb needed to be adjusted equaly and maybe cleaned. can you clarify thanks for the help

Check for air leaks. Clean the carbs paying attention to the idle circuit. Get your mercury gauge out and resink the carbs. If the idle is set too high (especially if carbs out of sink or dirty) you will get irratic idling. If the idle is set to low it will just quit. To adjust the bike properly make sure you have a tank of no ethanol fuel . No ethanol fuel will raise the idle. Ethanol fuel will lower the idle, cause some variation, and often times will cause knocking/pinging upon acceleration . Remember your bike was designed to run on 94 octane no ethanol. I guess we just have to be thankful they run at all on the fuel they sell nowadays.

Jul 10, 2010 | 1983 Honda GL 1100 Innerstate Gold Wing

1 Answer

How do I adjust the fuel mixture on a 1999 CL1500 CFX? It is running too rich.

Turn the fuel screws in until lightly seated. Back out 2 full turns on each carb. start bike and let it get to operating temp. turn screw out, or in to achieve highest idle for each carb. reset idle to about 1100-1300 rpms. Go back and forth between carbs and setting the idle. Rev bike a couple of good times and see that the idle drops normal with out stalling. Chaz Moto DC

Jan 22, 2010 | Honda Valkyrie Interstate Motorcycles

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