Question about 1994 Honda VF 750 C Magna

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Magna 750 carb bowl blocked

Magna 750 ran fine. After 1 week sitting, LF and LR don't fire. Spark is good. I loosened carb bowl drain screws and bowls appear to be empty and not accepting gas. Tapping on outside didn't help.
Any suggestions before I go charging in? Anyone seen this before?

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  • cwilcoxon102 Jun 21, 2009

    Thanks Belair, yeah, guess i was hoping for a miracle

  • bozcro
    bozcro May 11, 2010

    how many carbs does this bike have?

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Sorry but you're going in. the float needle sound like they are plugged. the best way to go is to pull the carbs and clean them out. Don't adjust anything! Then I would recomend installing an inline fuel filter

Posted on Jun 21, 2009

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Hi, Anonymous and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
15. Multi carburetors not in sync.
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2003 Honda VF 750 C Magna will not idle


Hi, Roy and the usual suspects are:
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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.
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1996 Honda VF 750 C Magna dies when the throttle applied


Hi, Court158 and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
15. Multi carburetors not in sync.
16. Faulty fuel pump or internal fuel line has pinholes.
17. Fuel injectors clogged or faulty.
18. Faulty throttle position sensor.
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Jun 08, 2011 | 1996 Honda VF 750 C Magna

1 Answer

A week ago i took my bike to get fixed at a shop it had been sitting for about 2 years the guy said it was a dirty carb and a dirty gas tank he cleaned both and the bike ran fine i rode it for 2 min. or so...


Try replacing spark plug,and check for spark if you do good,check to see if you have fuel to carb,at bottom of carb there is a float bowl screw loosen the screw and let fuel drain,tighten screw,choke and try again,sometimes when bike sits that long it may need one or two cleans,the bad gas that was in it still has varnash build up and can still clog up the jets.hope this helps.

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My bike sit for 2 months and now it won't start.


Yes the fuel can get old sitting in the carbs, as they are vented.
With luck you may be able to open the drain screws on the bottom of each carb and drain the bad fuel and it may start.( a squirt of aerostart fluid may help it fire)
Sometimes when fuel dries out in carbs it leaves a residue which can block jets, this needs the bowls removed and cleaned.
Charge up the battery while you do this, as i have had batteries that put out enough amps to spin the starter motor, but this drags the voltage down and the electronic ignition wont fire.

May 04, 2010 | 1997 Honda VF 750 C Magna

1 Answer

One or both front cylinders not firing and fuel running out of pipe


Hi, Lylejps 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 please click on the blue links below. Good luck and have a wonderful day.
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I have a gpz750r1 it will only run on 3 pots i have a good spark and comprestion


Hi and welcome to FixYa,

If only a single cylinder is not firing, initial possibility to consider and/or check since "...good spark and comprestion..." would be the carb; or more specifically presence / absence of fuel in the carb bowl and its ability to deliver fuel through the intake manifold to the combustion chamber.

A simple check would be to collect the fuel from the carb of the cylinder not firing through the drain hose (bottom of the bowl) and loosening the drain screw. Note the quantity and quality of fuel. Doing the same with the other 3 carbs would give you a reference.

Good luck and thank you for asking FixYa.

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1 Answer

2006 honda shadow areo idles, revs fine boggs on acceloration


Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Before putting the slide back into the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Apr 19, 2009 | 2006 Honda VT 750 Shadow

1 Answer

I have a honda magna vf750 the no1 carb keeps sticking aqnd rev.ing high ?


Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb.
clean the air filter and install the carb. Let the float bowl fill then start the engine.

Please rate this solution. Thanks!

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1 Answer

Xv750 virago 1990, idles on only 1 cyln then cuts out


Hi and welcome to FixYa,

Let's try process of elimination:
  • remove both pugs;
  • reconnect each plug to respective sparkplug wire;
  • ensure that the threaded metal part of the plugs touches bare metal of the engine;
  • crank/start the bike;
  • the plugs should show spark at each electrode alternately;
  • if yes, the plugs, coil, ignition system works;
  • if not, the plug not with sparks has an issue which could be the plug itself, the sparkplug wire, the ignition coil, the CDI/igniter.
Having done this and both plugs have sparks, then it is fuel issue. To verify, you could try:
  • at the bottom of each carb is the bowl with a drain screw;
  • if the each carb has fuel, loosening each of the drain screw would allow fuel from the bowl to drain through the drain hose;
  • which ever carb/bowl has no fuel draining would be suspect;
  • of course it could also be a blocked fuel line (kinked) or weak fuel pump;
  • if both bowls/carbs drains fuel, then it would be fuel delivery to the combustion chamber;
  • this then would require cleaning/rebuilt.
Good luck and Thank you for using FixYa.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

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