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Failure to idle (or even start/ run) without the choke is indicative of dirty carb(s), partially clogged slow jet. Leaving a bike to sit with un-stabilized fuel is inviting problems, ethanol is the culprit.
Sounds like the bike is struggling with being too lean.
The choke richens the mixture by increasing the fuel to air ratio
Often these old carbs get worn out and allow air in without going via the air box.
However I would look over the bike and ensure all cables and things are working properly. Ensure all gaskets, gromets and surfaces are seated properly.
Lastly cleaning the carb jets will ensure there are no blockages restricting fuel flow
Hi, most probably you must clean the main jet on your carburator . When you use choke you are inceasing the petrol ratio in the fuel mix by reduciing air ; and you need that because the main jet does not alow petrol to flow
Hi mate reverse the needle clip position back to factory setting this issue is pilot circuit for sure - If you have cleaned carbi you need to replace or clean the pilot jet and compress air clean the hole where the pilot jet came out of to clear the circuit. Running only with choke on is classic symptom of block pilot circuit...
Also check you fuel air mix screw this may have been altered trying to correct this issue it should be 1.5 - 2.5 turns out from fully closed..
all the change of needle position clip is doing is allowing your bike to run off the main jet (not good)
and reason for running with choke on is it is changes air fuel mix with choke on compensating for lack of fuel from the pilot jet blockage
Recheck fuel flow wth float bowl removed allow floats to hang free. And fuel will flow out, remove float needle check for sticking in seating, remove secondary jet and clean with fine wire to remove fuel contamination,also main jet, if all else fails find a used carburettor to replace old one
Here is a schematic of a carburetor. All you need to remove is the bowl at the bottom to access the jets. The choke richens the air/fuel mixture and makes it easier to start, however under normal conditions you will foul plugs out by leaving the choke on. If your bike is running right with the choke engaged, and shutting off when not choking, then your air fuel mix is too lean. = not enough gas. You are right in wanting to clean the jets. Hope the schematic helps.
If the bike has been allowed to sit for a while, the fuel may have evaporated in the float bowl. When this happens, the jets get stopped up with the gummy residue that is left behind. You may need to go through the carb and clean the slow jet and the main jet. While you're there, it would be advisable to install a new set of intake gaskets.
dear honda 750 your problem is a pluged main jet you must completley disasseble the carbs and give them a good cleaning with carb cleaner and comp air visually check to make sure you can see light through the jets after cleaning. your choke system by passes the jets that is why it runs on the choke setting only. hope this helps jim