Question about 1972 Honda CB 250

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Honda 1976 cb250 g5, one of my carbs is flooding all the time while engine is running, is there anything which can be done to repair this problem???

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Take the cards off the manifold and strip them both down, counting how many turns etc for the jet settings. Replace the float or float valve in the faulty carb and clean them both out. Reassemble the cluster and fit to the bike.
Job done apart from a little tuning to be done, most of which should be about right as you counted the turns on the jets.

Posted on Dec 30, 2010

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Posted on Jan 02, 2017

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I HAVE A 1980 250 SUPERDREAM with a flat spot had carbs balanced plus tappets ajusted but still there ?


Hi, Malcom if you changed exhaust or air filter you need to retune your carbs for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Hi, Anonymous and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat is worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
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Backfire when throttle down can be;
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2. no air filter
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Dec 15, 2012 | Honda CB 250 Nighthawk Motorcycles

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2005 Honda CB 250 Nighthawk leaking petrol from carb overflow line


Hi, Anonymous and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Oct 29, 2012 | 2005 Honda CB 250 Nighthawk

1 Answer

1992 Honda CB 250 Nighthawk only runs with choke on


Hi, Gracie and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Oct 21, 2012 | 1992 Honda CB 250 Nighthawk

1 Answer

1997 Honda CB 250 Nighthawk will not run without the choke on


Hi, Bill and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
For more information about your issue and valuable "Free" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

Does a GX240 Honda carb have mixing adjustments? It floods after running for 2-3 minutes then fouls the plug and stops. Thanks, Mike in SC


No, the only adjustment on the carb is the high/low idle. Check your engine gaskets for leaks using either water or carb cleaner, preferably carb cleaner. Otherwise just replace the carb, it's around 60 dollars.

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