SOHC.co.uk Forums > CB750
750 f1
SteveD CB500K0:
Hooligan
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hairygit:
Ouch, your eardrums after a couple of hours! If someone else fitted it they may have fitted oversize jets in an effort to clear a flat spot. Standard jetting in an F1 is on the lean side when they were new with standard pipes, emissions regs were starting to bite. Good thing with the 750 is you can check/change the main jets without removing the carbs!
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Redders33:
Cheers Hairy that’s a good tip, can the needle height be altered ?
hairygit:
Not with the carbs on the engine sadly, but at least you can check what jets are fitted before deciding what to do.
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K2-K6:
For starting and low speed (small throttle opening) check how the idle circuit screws are set as they have most influence there.
If you also turn each one individually while it's running, then you should get a response for each of the cylinders from turning the screw that's clearly heard in engine running. If you don't get that from each one, it points to that carb having its idle circuit partly blocked which could need cleaning to run effectively.
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