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Motorcycle Repair/Jetting CB1100RC



I own 2 RC'S and an RD. I bought a Dynojet kit for an IIOOF believing it would work in the RC but it is incredably rich everywhere with black smoke - it runs cleanly when the tap is turned off and fuel gets low in the bowls but at anything above half full on the float bowl level setting we get black smoke and I don't believe such a low level setting would work out on the road with the bowls being too empty. Do you have any ideas? Also all 3 of the 1100r came with very different needles nozzles and jets so I can't find a baseline. Could you give me the range of stock jetting for RC and RD. Many thanks in anticipation.

ANSWER: 1100F is much different to the 1100R.  Main jet sizes range from 105 to 125.  On the RC and RD models all four mains were the same I believe, on the RB, the inner carb jets were different to the outer carbs.  The CB1100RC and RD are well set-up by the factory, no need for mods unless you are making mods to the exhaust or airbox setup.

Good luck,  Jan

---------- FOLLOW-UP ----------

QUESTION: Thank you Jan.

However all of the jets on the 3 bikes are different so clearly previous owners have fiddled with at least 2 of the bikes meaning that I dodn't know what the stock jet ranges were for any of the jets on the RC/RD.
Can you give me the jets size range of all ofthe jets, needle sizes and nozzle sizes for RC/RD so I can establish a baseline. None of the 3 bikes run well so can't use any one of them as a baseline. I am at sea level so would err on the richer side of the sizes.
Thanks Craig.

Since you don't know what you are starting with, you need to make sure the needles are stock.  I would start with 115 mains.  If the bike runs rich on lower throttle settings then check the others jets too.  Sounds like you really need to get some time on a dyno to get these dialled in, anything else is guesswork.


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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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