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Need to clean that carb thoroughly. Clean or replace air filter, check gas tank vent on cap, make sure you have a good fuel stream coming out of the fuel petcock. The old gas could have clogged the petcock filter. In the picture you can see the arrows pointing to the reserve and the main. This is where the fuel comes in and it is a very fine "plastic screen mesh". This can become clogged. The one pictured us from a cat.
#1 sounds like a fuel delivery system issue. Make sure the fuel tank flows freely to the carb. (remove the fuel line from the carb--from the gas tank and turn on the petcock--gas should flow freely) The needle and seat may need to be cleaned or replaced, this controls the flow of gas into the float bowl of the carb.(remove the drain screw from the bottom of the carb (with everything properly assembled- petcock on)..gas should continually flow through the bottom of the carb --10-15 seconds of continual gas flow will make sure its flowing properly! Both of these sound like a solution to your problem.
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.
Good luck and have a nice day.
Sounds like your carburetors need a qualified professional to clean and set them... I have built several race banshee's.. the carburetors being perfect are essential to making it run good..
The compression should be at least 125PSI on each cyl. MINIMUM.