Question about 1998 Honda VT 750 C2 Shadow

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I have a fuel leak on the left carby the bike has been siting for a while drain fuel and put new fuel do they have nedle and seat

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Check the float and float valve in the left carb.
If it was left sitting on the side stand, that float bowl would have been pretty full, and is likely stuck open.
You can try spraying some carb cleaner through it, but chances are you'll at least have to remove the float bowl and clean the parts really well.

Posted on Mar 19, 2011


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My 11.5hp B&S Riding mower sat for a long time with a dead battery. When I replaced the battery I found that the darn thing wouldn't start now it will start, but only runs a few seconds and dies.

you have done something wrong with the needle and seat when you cleaned the carby out
That will allow fuel to continually flow to fill the sump
remove and overhaul the carby correctly

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I can get the engine started with the aid of the choke but cannot get the engine to rev at all. the engine just stops at anything near 2000 rpm. have had both carb stripped down and cleaned as the bike has...

Hi Roy ,

Your bike has been sitting in storage and the fuel is too old ad is stale by now .
Re open the carby , clean it properly with new fuel , all the jets need to be inspected for dirt or residue left by the old fuel , drain all the fuel out of the tank and replace it by new fuel .
The old fuel leaves a deposit film which needs to be clean so the best way is to pour a little fuel into your tank , shake the tank to clean it and drain it again .
Make sure that all gasket in the carby are clean or new as extra air intake will make the bike run rough .
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My r6 has been sitting for a few years. i left fuel in the tank, so i charged my battery and tried to start it up but it wont start. after getting old fuel out and new fuel, still wont start. any...

The carby's should be drained and flushed with an aerosol carburetor cleaner, available all auto/bike shops. The fuel tank should receive the same treatment, but a couple of cupfulls of fuel swished around and drained should be ok. Give the plugs a clean and thoroughly check all wiring connections for signs of corrosion. Take one plug lead off and turn motor over with a spare plug attached and check each cylinder for spark. Check all rubber components for persihing or cracking. Goodluck and cheers.

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1 Answer

Fuel is leaking from the carb into the cylinder and airbox when bike left overnight. Changed the jets but problem still there

You should adopt the habit of turning the fuel tap off when not riding, this will isolate the gravity pressure from the fuel in the tank.

The jets control fuel flow when engine is running,

I would think your float needle and seat is worn in one or more carby's. try a spray through of carby cleaner by turning fuel tap off and taking fuel drain screws out of all 4 carby's, disconnect fuel hose from fuel tap, allowing fuel to drain from lines and carby's. Spray carby cleaner into fuel hose and allow to flow out through all four carby's, allow to drain fully and dry out. Replace drains and fuel line and let fuel flow to carby's and see if a spray clean has done the job.

If not, inspect each floatbowl needle and seat. The link below gives exploded views of the bike in sections, with part names to help you get to them. Cheers.

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sounds like your float in the carb is stuck or the needle valve is bad. remove the bowl and push the float up to level. this should stop the fuel flow. be aware that only slight pressure should be needed.if it does not ck the needle valve. also mak sure you float is not damaged.

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2003 yamaha roadstar leak fuel sometimes after I shut it off I think the floats are sticking any solutions. Rick

Yes Rick, try a couple of tricks I know.First,open the carburettor drain screw located at the base of the carburettor,this lets fuel flow out of the carburettor drain located next to/under it.(To acces this drain screw look between the engine cylinders from the LEFT of the bike)While the fuel is draining out,tap the fuel bowl.Next re-tighten the carby drain screw and see how that goes.I would suspect your bike has a vacumatic fuel tap that has 3 positions on it.1 marked on, 1 marked res, 1 marked pri.If the fuel leaks occur when in the on or res position this means part of your problem is a leaking diaphram in the fuel tap.Replace this & when engine isn't running,no fuel can flow to the carby when it's in the on or reserve positions.After ensuring the tap is ok, and trying the first trick,if it still leaks,well then you'll have to pull off the carby and give the needle and seat a clean.
Hope this healps Regards Andy Porrelli

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Sounds like the carby is flooding.

Have you had it off?

Try putting a new fuel shutoff valve and seat in.

Set the proper float level.

Make sure that the float does not have a hole in it that makes it sink.

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It sounds like your bike has been sitting a while? The jets tend to clog up rather fast these days with our "new better" fuel. Especially if its been left out in the sun. The choke is actually an enrichment circuit on these carbs and essentially it bypasses the carbs. So if your having a problem with your carbs putting the choke on basically bypasses the problem but normally it doesn't help once you give it throttle... although sometimes it does because its adding that little bit of extra fuel the bike needs to run correctly, but either way you've got an issue with your carbs and they more than likely need to be taken apart and properly cleaned.

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My carburetor is leaking lots of fuel out of two different overflow hoses. would the float be stuck?

There are a couple of things that could be wrong.
The fuel shutoff valve in the carby could have something under it which stops it from closing.

A problem I had once, I had a souped up bike (250cc) and because I did not upgrade the fuel tap etc I wore holes in the bottom of the floats.

Did you have the carby in pieces?
If you did you might have left the fuel shutoff valve out.

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