Carburetor choked, Higher RPMS?

[LordHokage]

Im no mechanic or knowledgeable about carburetors what so ever but if the choke is in the up position i thought it was supposed to kill the engine?
When my choke is in the up position on my cb77 the engine idles higher @ 2000 rpms.
When the choke is in the down position it idles @ 1000 rpms.
Is there something wrong or am I confused?
The throttle works with both the choke on and off.
This is my first post!
I got my first bike this week. Its a 1965 CB77 all original and in good cosmetic and good running condition (i think?).

[Dgormley]

Yup, should run higher with choke on(up)...............................D

[Dana01]

Lord, The choke isn't supposed to kill the engine, although that can happen if the engine is warmed. The choke's job is to restrict the air inlet slightly so that the air-fuel mixture is richer, giving the cold motor a bit more gasoline vapors to chew on (thus raising the RPM's). This helps the motor warm up and get happy. Once the motor is warmed and running at the optimum air-fuel ratio, any further choking can bog the motor down by giving the happy motor too much gas. This can stall/kill the motor (hence the word choke :)

Enjoy your ride and welcome to the forum!

[bonjour]

When the engine is cold, it's good.

When the engine is warm(ed up) , this is bad, and most likely indicates an air leak or a to small main jet.

The choke should stall the engine when it's warmed up, if this is not the case, something is wrong.

What color are the spark plugs ? When you normally drove it for lets say 20 miles ?

If they are indeed white'ish of greyish, you engine runs to lean. Probably caused by an air leak or (unlikely I think) to small main jets.

The mainjets also can be 'plugged' (don't know the correct word) , and you have to clean the carbs.

Anyway, check the spark plugs color :)