SOHC.co.uk Forums > CB750
Warm up time
Bryanj:
Just posted it again in tips
royhall:
My F2 (same carbs) does exactly what you described from cold. But once warmed up it runs superbly. You didn't say how yours ran after the six minutes. Mine won't tick over reliably until it has done around 5 miles of running and is fully warm. It worried me a bit at first but the PD carb models all appear to do that. If it runs well after it's warm set your tickover at around 1200rpm and just leave a very small amount of choke on until your free of traffic or its warmed enough to tickover.
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K2-K6:
As Roy has said, they take a while to get warm and respond normally to throttle.
A few friends had F2s from new and they where exactly as described. You'd not find it easy to pull out from a T junction with it cold and the choke pushed in :o
Stone cold starting, two twist of throttle to pump fuel from accelerator pump, set choke, start and fast idle. As Roy says, pull away with some choke on until it's properly warm.
Even left to cool down abit when parked for a while you'd still then need to choke it a bit when starting again, especially if air temperature is lower.
Erny:
You perfectly described how my 750 K7 behaves...
I'm wondering if this cannot be improved by rejetting idle jets one step up to have bit reacher idle? Someone tried?
royhall:
Idle jets don't just control idle, they would be better called slow running jets. Upping the size will change the mixture to around third throttle.
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