1978 honda supersport 750 four12/22/2023 ![]() ![]() Is there another thing to check on the carbs? maybe the accelerator pump is sticking?Ĭould this be an issue with incorrect valve clearances? There is no vacuum leak either, I spray some carb cleaner around every carb and intake boot while the bike was running and it did not rev up. But it is not, I did another carb sync with the bike very warm and the readings are still perfectly the same on each carb! I was almost sure this was a carb sync issue, I had the same problem on a FJ600 and solved by re-sychronizing the carbs. It does not want to go back to idle, as soon as you rev it up, in stays up around 3500 rpm! it doesn't go back to the 1200 rpm idle, unless you put in it first gear and gently let go the clutch while braking to try to stall the engine. However I am have a issue I can't resolve: when the bike is warm, after a 5min ride. The bike restarted right away! I then synchronized the carb using vacuum gauges. I completely rebuilt the carbs: tore them apart, did ultrasonic cleaning on every carb body and parts and rebuild everything with rebuild kits (new seals, jets, etc.). ![]() ![]() The bike sat in a barn for about 20+ years but was in good condition. I am in the process of restoring a 78 CB750 Super Sport, the last SOHC model of the 750 fours. ![]()
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