Rebuilt all four carbs cleaned and replace needle and seat.Bike runs on choke at idle but will not excelerate,dies when you turn the throttle. feather the throttle past 3000 rpm and it will respond but still on choke with some back fire. but will not run at all off choke. The carbs had old gas that was drying inside them is the reason for the rebuild.

The choke makes the fuel/air mixture richer, so your stalling issue tells you that the main and/or idle jets are blocked. Take the carb off and clean all the jets. If you remove the mixture screw, tighten it gently first counting to the nearest quarter turn how far in it goes and write it down. Also write down what notch setting the main jet needle is on. If is has fuel injection, it is a whole different ballgame!

'year make model' in all questions please as the first 3 words.

1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.

It's a carburated bike. You need to have your carburator cleaned. It's not a difficult job, howver if you are not comfortable with what your doing a shop will charge a half hour or 1 hour o clean it for you on average.

Your carborator mixes your fuel and air. when the bike is at idle it is only getting fuel from the "idle" needle. The smallest needle in the carb. These needles are hollow. As fuel sits in the carburator for a long period of time (over 2 weeks) then the fuel can gum up and clog the neeedle. If it runs when the choke is on but dies when you take it off the choke this is what is happening:

On some bikes a "choke" doesn't actually choke it of fuel, sometimes it actually enrichens it. Your bike is probably set up to open another passage way besides the "idle" needle allowing fuel to go into the engine from another passage. you shut the "choke" off and now it only has the idle needle to get fuel from. If that's clogged the bike dies.

A can of carb clean and a screw driver is usually all you need to clean a carb. But if done wrong you will pay more to have a pro fix it.

Sounds like the idle circuit in the carb is restricted. The engine is running on the choke only. When the engine reaches a certain temp the fuelthat does get is more readily burned allowing you to back off the choke. The choke probsbly can't be completely opened? right? Fuel quality is also something to consider Oil content in fuel affects combustion temps and volatility. _good luck_Ned_

The slow jets and adjoining passageways are still dirty. As painful as it may be , take the carbs off and clean the slow circuit again or it will never idle. Double check the fuel pump is working properly and the fuel filter is not plugged. One time it took me four cleanings to get all four carbs working on a Suzuki that sat for five years. Also make sure none of the carburetor boots have developed rips from age.

sounds like you might have some trash in carb being a clogged pilot or main or needle seat in not letting in the proper amount of gas check all passages and use fresh gas if it has been sitting

On most bikes, opening the pilot needle screw actually leans the mixture , as it is an air screw, not a fuel screw. I'm not for sure that this is the case in your bike, but if you can find out exactly what carb it has, I can tell you. Also, a freshly rebuilt engine is going to idle erraticaly until the rings are seated and broken in. Be sure to check your carb boots and vaccum lines for cracks and leaks, as a vaccum leak can cause a lean condition.

Sarge

carb needs to be removed and dissasembled and soaked in solvent.

Quitting is a no-no. Move the needle clip down one notch and also remove and clean the carb if it has been dieing..