SOHC.co.uk Forums > CB350/400

Hesitant revs below 3,000 RPM when hot.

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Bradders:
Morning. Been having trouble with my 440/4 recently. Starts nicely and ticks over fine( although maybe a bit fast) but it’s very hesitant to rev below 3,000 rpm. Makes pulling away from the lights or riding in slow traffic a pain. Runs nicely otherwise. Problem only occurs when hot. Any ideas what the problem might be ? Thanks in advance.

Nurse Julie:
Has it always been like this or has it only started since you fettled / adjusted / changed something?

Rob62:
You should never get into guessing...but mine would be running lean..?

Bradders:
Hi Julie. It’s not always been like it, just the last 6 weeks or so. Not touched anything on it but only does it when the engine is hot.

Nurse Julie:

--- Quote from: Bradders on August 07, 2019, 11:48:44 AM ---Hi Julie. It’s not always been like it, just the last 6 weeks or so. Not touched anything on it but only does it when the engine is hot.

--- End quote ---
Most strange....I would agree with Rob, sounds like a running lean issue but unless you have picked up some debris that is partially blocking the idle jets / circuits, I can't see what else would have caused it to start recently. I know a couple of weeks ago, when we had that very, very hot weather, mine didn't feel at her best when the engine got very hot through hard riding but as soon as the air temp dropped back down into the upper 20°'s she was back to her usual running spot on state. What fuel are you using, el cheapo supermarket like i do or the upmarket expensive stuff? For a start, i would put some STP in the fuel tank and see if that has any beneficial effect. If no different, check air screw settings and if no better, report back.

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