Question about Honda CB 100 Motorcycles

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My carburetor is over flow.what is the problem of my carburetor or what i need to adjust?thanks

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Adjust float

Posted on Oct 12, 2010


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Posted on Jan 02, 2017


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How do you adjust idle speed 1991 johnson 100 hp

not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

(Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
(J. Reeves)

The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

(Carburetor Adjustment - 2 Slow Speed Adjustable Needle Valves, each carburetor)

Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

Jun 28, 2017 | Cars & Trucks

1 Answer

Why does my edger stall when you take choke off ??

Carburetor adjustment required.
Most common items to check when sm. Gas engine won't run at full capacity (like choke off, or full throttle) are simple maintenance procedures. Check the following when engine bogs, clean or replace...
  • Spark Plug
    • When dirty with carbon buildup, proper spark gone - can't provide for good ignition
  • Fuel Filter, it's probably in the gas tank
    • When dirty, good flow is pretty restricted, engine starves for proper amount of fuel
  • Spark Arrestor Screen, at muffler
    • When all clogged up, exhaust flow is very restricted, creating back pressure = bogging engine
  • Carburetor, may need a rebuild kit
    • When dirty, clogged up and plugged up with build up of sediment, fuel flow is pretty much, down to a trickle. A good cleaning is usually the fix - a replacement of integral parts found in a rebuild kit = Time Well Spent
    • Then make sure you adjust properly
Look here...


One more...

Jun 13, 2015 | Ryobi Garden

2 Answers

Only runs with choke mostly on

  • Your carburetor High / Low adjustment screws need adjusting?
  • Replace fuel filter, It's IN the Fuel Tank.
  • Dirty carburetor, clean or may need new kit.
  • Spark Arrestor screen at muffler may be completely plugged, this creates restriction for exhaust flow
Check this video out...

And this one...

And one more:

May 28, 2015 | Garden

1 Answer

Yamaha v-star float bowl adjustment

No. Wrongly adjusted float height makes the engine fail to run.
If you get over flow leak (from the overflow hose) your fuel needle inside the carburetor simply does not close the gas supply hole firmly even if the floaters still pressing it against that hole.
That is because the over flow holes on a carburetor are so far above the floaters that even with the float height wrongly adjusted, the fuel needle should stop the gas from overflowing and simply made your fuel mixture too rich.

Oct 11, 2012 | 2003 Yamaha V Star 1100 Classic

1 Answer

Does the spring loaded screw on the carburetor bowl on the 15hp liquid cooled engine adjust the float level?

No. A metal float is adjusted by slightly bending the small metal tangs on the float that hold the retaining pin as it hangs from the main carburetor body . If you feel the need to adjust the level of the float, your normal setting is with the float "level" in relation to the lower carburetor body. That is in it's raised position when it has sealed the fuel inlet by pushing the float needle all the way into it's seat; thus shutting off fuel flow into the bowl.

May 07, 2011 | kawasaki Garden

1 Answer

Craftmans snow thrower model 247.887900 will not stay running. I changed the plug and the gasket, cleaned the carb, but it only runs for about a minute then shuts down. Is there an adjustment I need to...

Remove the fuel line from the carburetor to check the fuel flow from it--there should be a thin stream of fuel flowing out--if it just drips, something is plugging the line, fuel filter, or shutoff valve. If it seems ok, then the float and needle valve in the carburetor bowl may not be allowing fuel to flow into the carburetor. It is probably necessary to remove the carburetor to check these components. Make sure to have fresh fuel in the tank. Hope this helps!

Jan 22, 2011 | Craftsman Garden

1 Answer


In a 2-stroke engine, the valving is done by the mechanical relationship of the piston position in the cylinder. No adjustment is possible other than grinding the cylinder ports or changing the piston skirt shape. You need to check the fuel filter (in the tank), air filter, and muffler for plugging. Because the engine is designed to burn a small amount of oil with the fuel, the muffler tends to plug over time. Check the fuel lines for decay or other damage. The carburetor has a rubber diaphragm in the lower chamber that decays over time as well. Go to: for a 12 page article on Walbro brand carburetors that are typical of chain saw carburetors. Good theory and troubleshooting information. 2-stroke engines are picky about air leaks behind the carburetor. Hope some of this helps!

Aug 05, 2010 | Garden

1 Answer

Lawnboy with lmr -10 walbro lacks fuel supply

you will need to take the carburetor off, take it apart, and soak it in a can of carburetor soak. You can find it a an automotive store. Then you will need a K11-LMR rebuild kit to replace the parts in the carburetor. The carburetor probably has some ports clogged up. When you get that done , put it back on. Turn your adjustment screw all the way in, then turn it one and a half turns out and work with it from there. Adjust the adjustment screw in or out as needed. More in means less gas, more out means more gas.
Check spark plug and air filter while you are at it.

Dec 11, 2009 | Garden

1 Answer

I have to close the choke for it to stay running it run rough

your cutting the air flow off to the carburetor allowing more fuel in, check all fuel lines, and filters, and fuel pump if you have one. If all ok than your going, to need to flush the int-ir fuel sys (clean). replace your fuel filter, and over haul the carburetor. replace your plug and oil too. Use a good aerosol carburetor cleaner. After your done use fresh fuel (stabulized). adjustment may be needed to the carburetor. Some Carburetors Are EPA and no adjustments are needed except idle screw. good luck I hope this helped.

Oct 17, 2009 | Briggs & Stratton Garden

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