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Re: What is the stock fuel/air mixture setting for a 1982...
Keep that bike immortal by secureing a haynes or clymer manual in bookstore or library--the setting can vary depending on which jet -the idle is set in factory n no values r displayed
personal remarks not allowed by fixya-ur on report--ok whats the cool answer-been working on bikes since 68personal remarks not allowed by fixya-ur on report--ok whats the cool answer-been working on bikes since 68
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There should only be 1 screw located at the base of the carb facing outward.
The method I use requires a tachometer. If you don't have a tachometer then you can use the "by ear" method, though it's not as accurate.
With the engine off, start by turning the screw all the way in, then back it out 1 and 1/2 turns. This usually give you a baseline to start with.
Start the engine and get it up to operating temperature, make sure the choke is fully open, and have the air cleaner and all vacuum lines installed.
Using the tachometer (or ear) turn the screw (usually out) until the RPMs increase. If they don't increase by turning the screw out, then try turning it in.
Eventually the RPMs will stop climbing while turning the screw (as said earlier, usually out).
THEN turn the screw the opposite direction (usually in) until the RPMs JUST start to drop off. That should be real close to the optimum setting.
This setting is ONLY for the base idle air/fuel mixture and is NOT for anything else.
Sounds like your fuel air mixture is a little rich. Check your plugs, if they are black you are running rich which will cause some of the excess fuel to be burned off in your exhaust. Two common problems with a bikes fuel air mixture is bad plugs, if one does not fire consistently all the time it will leave excess fuel in the combustion chamber. Another would be a clogged air filter keeping the fuel air mixture unbalanced as well.
Lastly if you are able to, you may adjust your air fuel screws on your carb. However most Honda's are stock with Keihin carburetors and these air fuel screws are plugged so you cannot make adjustments without drilling out the plugs.
Sounds like fuel supply problem.Take the carburetor apart and clean it thorough especially the pilot screw (use new o-ring) and the idle jet should be perfect cleaned.Check your rubber insulator where the carburetor plugs on to if it has any cracks and draws extra air in the mixture.
To adjust your idle speed there is a single screw (usually with a black plastic knob ) that hangs down between the two carburetors. Turning the knob will raise or lower the idle speed. Clockwise will raise the idle. Counter clockwise will lower the idle. Changing the idle speed will not lean or richen the mixture. To change the mixture you will have to rejet the carburetors. I assume the carburetors have been rejetted to compensate for an after market exhaust system. In which case the carburetors are set too rich (too big of a main jet size) to compensate for a bad flat spot in the acceleration. If this is the case, take out the main jets and replace them with the next smaller size. If the machine is stock then check your air cleaner. If it is restricted/dirty, then the extra vacuum caused by the dirty air filter is causing the rich mixture. Try changing the air filter or in stall a high flow air filter like a K&N. This will put the mixture back to normal.
the carburetor settings are easy :
1- locate the screw mixture air /fuel
2- wind the screw all the way in
3- unwind the screw 1 1/2 turn and this should be sufficient to set the carburetor back to its original settings for the air/fuel mixture .
4- as for the idling screw , wind it down to suit the revs required
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