Stalls when you give it gas

[firstwing85]

I'm working on a friend's bike and since my wing is a fuel injected I'm not very informed on carbs.
My friend's bike idles beautifully but when you crank the throttle it just dies,
If you throttle it up very slowly till you're up at 2500 then it works great but if you hit the throttle too quick at 1000 to 2000 RPM then it just quits.
Almost like it's starving for fuel.

Can some of you more knowledgable guys tell me if I'm on the right track?

Thanks.. Johan

[admin]

First, check the quality of the fuel in the tank, dump it and use fresh if the old stuff stinks or is old. Open the drain plugs on the carbs to check for water in the fuel. Next, what is the engine temp? If cold the choke needs to be on. Does the choke work? Lots more to check, but, this will get you started. Also, check the spark and spark plugs, if they are weak you won't pull any revs. Good luck and let us know what happens.

[firstwing85]

Thanks Vic,
I already drained and flushed the tank and also the carbs, used fresh fuel and still did the same thing.
But did find out that one carb is not responding properly so I've now taken the carbs out and opened them up and soaking them, seems like one of the jets is gummed up so soaking both.
Will update you next week when I put it all back together.

[admin]

Good luck with it and I'm sure you won't forget to replace the fuel filter.

[firstwing85]

Thanks Vic, I'll make sure I don't forget. :-)

[bs175dths]

Clean the jets and blow them clear with compressed air….. either a compressor or your lungs. (get a firm hold of the jet, or you will be spending time searching for the little bugger)
Shoot compressed air into the air passages as well.

Remember, today’s cleaning chemicals can destroy yesterday’s gasket materials. Today’s carburetor cleaner can destroy 1985 gaskets!
Seafoam is recommended on the site for a variety of causes, it would do well for carburetor cleaning.
The carburetors were designed to (excuse the pun), pass gas, so gasoline can be used as well.
Either should be used with EXTREME caution and plenty of ventilation.
NO OPEN FLAMES.

Once the bottom of the carburetor is clean enough to eat off of, and the float levels have been set, turn you attention to the top of the carburetor.
Those throttle needles need to ‘float’ up and ‘glide’ down.
Before removing the four little screws in the top, use your finger to lift that throttle needle piston.
Does it go up without hesitation? (float)
Any encountered resistance will cause that particular carburetor to lag behind the other three (assuming the other three are floating too)
Releasing the throttle needle piston, and it should close with a distinctive ‘click’ or ‘snap’ sound.
If there is resistance, there may be dried fuel residue on either the piston walls or the cylinder walls, or both. Cleaning with gasoline will remove the residue.

Use caution when removing the rubber diaphragm so as not to tear it.
Use the same caution when reinstalling so as not to pinch it when you put the top of the carburetor on.

After cleaning, do the finger test again. Can you feel a difference?

There are a lot of things going on in the bottom of the carburetor, but there are some important things going on in the top as well.

Now that one carburetor is clean and ready for the road, time to clean the other three.

Hope this helps.

-Ride On