Question about 1982 Honda VF 750 S

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Carburettor float level setting

Recommended carburettor float level setting

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Usually if the float is adjustable you will set it so if there is a flat surface on top or side of the float it will be parallel with the bottom surface of the carb body when the needle valve just closes (before depressing the spring in the needle)

Posted on Oct 03, 2009

Testimonial: "thanx a lot my friend i will give it a try. my 82 sabre floods permanently"

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82 has a hot start problem. that is why they redesigned the intake, carbs, frame, etc for 83. There was a mod, but I never found out what it was. make sure your filters breath well, not too oily. I had success with a touch of throttle on hot start to get those butterflys open. of course, old needle valves will leak and then you truly are flooded all the time. $25 fixes that needle valves.

Posted on Dec 03, 2009


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Briggss and stratton 13.5 OHV motor in ride on mower wont start

It seems that you have done all the good stuff, so my advice is a shot in the dark. Sometimes when Lawn mowers are put away for the winter, the fuel left in them will become stale. Remember it is not the fuel that burns, but the fuel vapour. If the fuel is stale it won't vaporise properly. I would suggest that you empty all the old fuel out and put some fresh fuel in.
If you have a good spark and the spark timing is correct, also assuming you have sufficient compression, then the problem is almost certainly the carburettor. How did you clean it? Cleaning a carburettor is a delicate task and requires compressed air to blow through all the little holes and jets. You need to make sure that the float actually floats. If it is a metal float, they can fil with fuel and sink. The float turns off the fuel to the carburettor, thus the float valve is very important. If the float valve leaks the engine will over fuel and not pick-up as you describe. The float level must be set at the correct setting. If the float stops the fuel off too early the engine will run lean or not at all, since on some carburettors the fuel mixture will be further reduced by what are called Defuser jets. If the float level is too high, the engine will run too rich.
After starting the engine, when it stops again remove a spark plug and examine it. The spark plug may give you the clue you need:- If it is over wet with fuel, if it's oiled up, or if there is a total lack of fuel altogether.

I'm sorry to be a bit vague, but sometime diagnostics can be hard from a distance and without seeing it for myself. Nonetheless, I hope that I have been of some help.

Regards, Bob


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I assume it is a carburettor model. Open the carburettor and check the floats and also where the floats hook up to the overflow valve. Set according to manufacturers spec. The fuel level should be liwer than the bottom seal

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Hi, Rooneys_no1f and the usual suspects are:
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For more information about your issue please visit the websites below. Good luck and have nice a day.

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hi, looking in my manual for that year of bike, there is no mention of the float level, however normaly the float height of a constant depresion carburettor such as this is 27mm, this can be checked by holding the carburetor vertical with the air filter side facing up then slowly invert it until the float is just resting on the needle and not compressing,it.measure the distance between the gasket face of the carburettor and the bottom of the float. the fuel level can also be checked by using a lengthh of clear fuel pipe fitted to the drain at the bottom of the float chamber, undoing the drrain screw with the fuel pipe turned upwards toward the slide the fuel will climb up the pipe and show the present level,

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I'd give you a diagram but carburettors vary so much its got about a 99% chance of being useless, get me the info and i'll get you a step-by-step guide for fixing the carburettor.

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1 Answer

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Have you tried checking the float level in the carburettor?
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