Normal Choke Operation

[Proshift]

I have a 1978 CB750. When I start my bike with the choke all the way out, the idle spikes for 2 seconds, then drops down to 1200rpm. On my previous bike, when I started the bike with the choke all the way out it would stay low around 1000rpm, then go up to 3000rpm. When the bike got up to 3000rpm, I would then push in the choke to bring the idle down.

My understanding, is that the idle should climb as the bike warms up. Has anyone else experienced this?

Cheers,

J

[shinyribs]

"All the way out " may be too much choke after running for a few seconds. The choke is just like your throttle :it has an infinite number of positions. Every bike /engine is different. See what yours like and try and  keep her happy.
 

[LukeM]

Moved this topic to a more appropriate location.

Luke M

[Re-run]

The choke actuates a fast idle cam. This cam should be set so that the bikes idles about 2500 rpm when fully engaged. Reducing choke will reduce the fast idle. Of course idle will fluctuate as the bike warms.