The carb has been off and cleaned twice but has made no difference.
Sounds as if it is starving for fuel. You need to look for obstructions in the fuel line or a clogged filter. Most commonly it is trash or goo in the needle valve in the carb. It could also be that the float is not properly set. the float in the bowl needs to be properly angled to allow the required amount of fuel to enter the carb when it is needed.
SOURCE: will only run with full choke and absolutely no throttle.
Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.
Use a couple of cans of Sea Foam.. best stuff in the world.
SOURCE: Honda shadow running lean
Hi and welcome to FixYa,
I can't comment yet on the "neoprene tubing...coming from...carb to the engine" as I have to get hold of the service manual to confirm.
However, if the sputtering is consistent on reaching a certain RPM rather than speed on any gear, then there would be a most likely air leak. Verify that the air box/enclosure is tightly sealed, seated on to the carbs securely, the coupling locked in correctly, the air filter positioned correctly and the box cover tightly seals the whole enclosure.
This condition is also possible if the air filter has been replaced with an aftermarket open breather such as some models of the K & N wihtout rejetting and carb tuning.
Good luck and thank you for using FixYa.
SOURCE: I have a 85 Honda Shadow vt 500. Engine is surging
did you clean all the jets good sounds like it may be in the jets and needle part of the carbs
SOURCE: honda 1300c backfire through carb at wide open
If you have used Dyno jet kit I have had a kit come through with smaller main jets than the stock ones causing it to run way to lean.
SOURCE: when I start my 1998 honda xr80r it revs to near full throttle
it sounds to me like the throttle slide has been installed incorrectly,unscrew the throttle housing off the top of the carb(it looks like a cap and the throttle cable goes through it)remove the throttle slide from the housing,down one side of the throttle slide there is a piece cut out that goes the whole length of the slide (lookes like a groove),inside the carb body there is a small brass knob,this groove or cutout goes over the knob and it stops the throotle slide from rotating,once you have installed the slide back in the carb the slide should drop right to the bottom of the housing,you can check this by looking through the rear of the carb and you should be able to see the bottom of the throttle slide,if the slide is installed incorectly the little brass knob stops the throttle slide dropping to the bottom of the housing and will give full throttle,its an easy fix and wont take more than 10mins to repair,hope this helps
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