SOHC.co.uk Forums > CB350/400

Warm starting issue

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Athame57:
These past few weeks I've found it very hard to start my engine again if I switch off with a hot engine. Keeping my finger on the starter and closing the choke usually gets me going again....any ideas?

400 Cafe Racer:
If you need the choke to start a warm engine, it sounds like fuel starvation or excess air. 

Could be blocked jet(s), restricted fuel flow, vent blockage on tank.  Excess air, could be flexible mounting rubbers leaking etc.

Let us know how you get on. ;)

Dennis 

Athame57:

--- Quote from: 400 Cafe Racer on July 28, 2023, 09:32:46 PM ---If you need the choke to start a warm engine, it sounds like fuel starvation or excess air. 

Could be blocked jet(s), restricted fuel flow, vent blockage on tank.  Excess air, could be flexible mounting rubbers leaking etc.
Let us know how you get on. ;)
Dennis

--- End quote ---
I'm about to overhaul my carbs as it happens, just bought some bits of Julie  ;) I'll take those things into account and come back with results!

McCabe-Thiele (Ted):
I would have suspicions about an air leak between the cylinder head and the carbs as my first line of investigation.

Matt_Harrington:
All I can add is that the non OEM air screws (probably chinese) as so different from the OEM ones that they are almost (perhaps I should say totally!) useless.

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