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CB550F2 '77 slow to rev when starting

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alexdecker:
Hey all

So my bike starts up pretty fast. But when it starts, it doesn't come up in revs by itself. It kind of halts a little bit, and then needs a small twist of the throttle. When doing that, it settles in on a nice 1200RPM after that. But if I don't rev it a little, the engine dies again.

Is this the normal nature of the beast, or can I optimise something to prevent it?

Johnwebley:
When the motor is cold, its normal,
These are 50years old carbs and bikes

Once warm,it should run nicely just over 1,100 rpm

Sent from my SM-A546E using Tapatalk

Oddjob:
If it's set up well John you should be able to press the button and walk away and it will only need the choke closing a little after a minute or two. A good tickover is 1000 revs, anything over that is compensating for noise and wear in the engine, a really good engine will go as low as 600 before it starts to splutter. That's in an ideal world though, modern fuels don't help. Try vaccing the carbs Alex and see if anything has moved..

alexdecker:
Wow, 600 reps! When mine is warm, I can get it to 1000rpm when idling, but 600! Has anyone done that?

McCabe-Thiele (Ted):
Mine seemed happy at 1200  (once warm) before I took her to bits.

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