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Motorcycle Repair/CB1100R float level


Hi, bought a CB1100 RC late last year and have done some maintenance on the bike during the winter. The bike was running rich, black plugs and exhaustpipes and seemed to "hesitate" when revving from 6500 rpm and more. I have found that the inlet cam chain was not adjusted properly, otherwise it was ok. Leak-down test was fine, valve gaps in spec. Carbs taken apart and ultrasonic cleaned, properly jetted. The throttle needles shows no wear. Now to my question, with new original float valve needles, what float level should it be, as measured from the float to the carb body with the carb angled so the float just touches the valve needle.

I normally set the float heights to 15.5 mm, this is also where the floats look level with respect to the bowl upper edge.  Make sure you used original Honda float valve needles or very good aftermarket ones to save headaches in the future...
Cheers,  Jan

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Jan Ringnalda


PLEASE NOTE: PLEASE READ THIS!!! I can help with questions ONLY on any Honda CBX-1000 motorcycle, only 1978 to 1982. OR 1981 to 1983 Honda CB1100R models ONLY Honda CBX/CB1100R motorcycles, Please NO other makes, no other models. IF YOUR QUESTION IS FOR ANY OTHER BIKE Your question MAY BE FORWARDED TO THE QUESTION POOL WHERE IT MAY NEVER BE ANSWERED. IF I ANSWERED YOUR QUESTION, and you feel the need to give me marks lower than 10, first post a follow up question. If you mark me lower, I will respond and you run the risk I will never, ever, answer one of your questions again. I'm doing this free of charge, as a service to fellow motorcyclists. If you do not value my time, I do...


Have owned over 50 of these fine classic Honda motorcycles

International CBX Owners Association, SAE, Materials Research Society

CBXPress, VLMC magazine, Used Bike Guide

PhD in Materials Science, Post-Doc in prototyping automotive components

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