SOHC.co.uk Forums > CB350/400

400/4 won't idle when hot.

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Harold 400/4:
My 400/4 started stalling when it was hot, but I also lost power. Turned out to be a slight kink in the fuel line from the tank to the carbs which was restricting fuel flow.  All seemed ok when it was cold. Not sure this is what's up with yours but may be worth a check. Someone on here will have the answer. Good luck!

Nurse Julie:
Thanks to those of you that gave me some advice. It doesn't seem to loose power when hot, fly's along quite happily. Harold 400/4, I will look at the hose to make sure not kinked. And yes Bitsa, I am totally legit, no wind up. I'm a Nursing Matron who still see's the funny side of life. I have been a Nurse on and off for 34 years and have been riding bikes for 35 years. If people on this Forum want to have a laugh at my expense, that's fine by me. Just answer the question I ask as well and we will get on just fine. Must go now, on a night shift.

Dan:
Is the choke fully off? The nut holding the choke lever in place on my bike came loose once allowing the choke to come on and give similar symptoms. Obvious when I spotted it.

May need a carb clean otherwise.

Lobo:
Hi Julie, never got to say welcome .... so, WELCOME!

Forgive me given your biking experience; I know this sounds daft, but the 400F at full choke will have a high tick-over due the choke mechanisms lifting the idle stop @ full choke. In other words... set the idle (1200) when the engine is warm.... and then expect high'ish revs at cold /from start up.

I assume the carbs are clean / balanced etc.

With the choke OFF, set the distance 'B' @ 0 to 0.3 mm / 0.012"
Start the engine, warm it up, and then via the throttle stop screw (top pic) set the idle to 1200 rpm.

You also might want to check the choke valves are fully opening... as a starter for 10 I'd simply check the linkage & grub screw (lower pic & bottom right'ish) are at indeed full travel stop when the choke lever is OPEN (ie choke OFF). Taking the Airbox off etc to visually check is a real pain....

If no use, then perhaps a carb clean & full set-up, though hopefully not necessary as you do say she's otherwise  running nicely.

Cheers,
Simon

(my better half a nurse, but alas shows nil interest in the bikes - so we refer them as 'the red one, the yellow one & the green one'. Any tips?)

Nurse Julie:
Thanks Lobo and Dan. All sounds straight forward. Will have a tinker when I get time and let you know what happens.

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