SOHC.co.uk Forums > CB500/550

CB550F2 '77 slow to rev when starting

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alexdecker:
Well I just went through the whole maintenance routine (cam chain, valves, timing and vacuum sync). It still halts a bit when cold. When warm, it idles beautifully on around 1000rpm, but when cold, it stalls out on the same idle screw adjustment.

I don't know if choke is really necessary when the temperature is as warm outside as it has been for the last few weeks. With 25 celcius and sunny conditions, I can start it fine without choke. Do you guys use choke either way?

No matter the temperature, I have to keep it a little up in the revs by holding the gas handle, until it is warm. Then it will stay at 1000rpm with no trouble.

There is just something beautiful about pressing the start button once, and have it go into idle, even when cold. But maybe that's a dream only with these old bikes and carburettors.

McCabe-Thiele (Ted):
I may be mistaken but I thought there is an idle adjustment screw on the handlebar  right lever bracket just for this purpose - it might be 500 only.

The screw operates a ramp to hold the throttle open until everything is at working temp.

Oddjob:
That was put in by Honda Ted to allow the mechanic to test the advance/retard mechanism, it can maintain a steady RPM, it's also useful to lock the throttle on the motorway for instance so it allows you to rest your wrist somewhat as we all know how heavy the throttle are on these early Hondas. 99% of my use was motorway.

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