Carburettor choke adjustment

Dear carburettor fanatics :laugh: ,

Sorry for bombarding the forum with so much questions. This place is awesome for getting right informations!

(bike: KZ750-R1 aka GPz 750 1982)

The carbs are mikuni BS34.

Ok here's my problem... when i start the bike cold with the choke i need to give it some throttle if not it will not start.

Here's my startup procedure:

1. Full choke give some air with the throttle and crank it
2.After 10 seconds it starts to rattle and bog so i need to put it on half-choke or it will stall (too rich maybe?).
3.I need at least 3-4 minute of heating before riding then i remove the choke then need to play with the throttle for the next 15 minutes or it will stall at a stop or when the engine have a chance to idle!

Doctor what's wrong with the carburettor?:blush:

Ambient starting temperature average 90-110 F so it's not cold here!

thank you very much guys!

Best regards,
laurent

Sounds like the jets are too small to me. Pod filters?

Sounds like the jets are too small to me. Pod filters?

nope everything is stock except the pipe!

best regards,
laurent

Did you rejet for the pipe? Do yu know what jets you have?

i don't know for the jets I've just bought the bike and the pipe was installed in the eighties... I guess the previous owner have rejected the carbs!

As they say," assume makes a ass out of you and me.

Ass u me

Wouldn't hurt to check.

ok i will check this... but first i need to know where to inspect.

The choke is regulated by which jet... main or pilot ?