[RockyMtnVTX]

idle adjust

When its a cold start you have to feather the throttle a bit to keep her running. Or set your a/f screw out a bit and that takes care of that. Did mine. Like blackdot said check out that gonzo video for th sound of 900. For USMC1341 fiddling with the adjustment, once you have it set , its set. Yes it sounds fast when your hot but thats the way its suppose t be. For cooling and oil pump purposes. ANd wngd- what do u mean it only turn a quarte of th e time, its a direct link to the throttle on the carb, does it change the idle when you turn it?

 

[Donut]

I have the same issue with my C starting in the very cold weather. It starts very rough and will sometimes die. You can't use the throttle or cruise control since that immediately kills the engine.

Above the breather there are two knobs, one the idle set (?) and the other has a crimped metal band (?)

I turned the non metal banded in until it set and turned back two full turns out but I think it went in more than two full turns (hard to tell when it only turns about a quarter of the time. Given my aforementioned cold starting problem, how does this make sense and what did I do???

Below the breather right side.
One is the idle adjust and the other is the air box drain tube and should be drained periodical and any oil in it is actually a good sign so if you see oil and moisture in the Borromini of the airbox that tells you that the air box vent tube is not plugged. * A BAD THING? now as far as it running rough when cold it could very possible that the a/f is set too lean from the factory.
Factory sets them at 1 - 5/8. And should be at 2 - 1/2 turns out from a lightly seated.

Donut/Doug

 

[doug48317]

I turned the non metal banded in until it set and turned back two full turns out but I think it went in more than two full turns (hard to tell when it only turns about a quarter of the time. Given my aforementioned cold starting problem, how does this make sense and what did I do???

Pardon me if I missed something along the way as I haven't caught up on the whole thread.
But... if I'm reading this right, you turned in the engine idle control knob and adjusted it like you would the A/F screw. As I'm sure you found out that won't work for you at all, with the idle there is no set amount of turns it needs to be set at. You'll have to get it running and then turn that knob back in until it will stay running on it's own.

The A/F screw is the one you'd want to turn all the way in until it is lightly seated, then turn it back out 2.5 turns to be in the right ball park. Unless you have one of Glens A/F tools on it there won't be a knob behind the airbox for it. As Donut said, the one is the engine idle and the other one with the band is the airbox drain.

 

[Gonzo1970]

900 rpm +/- 100 video from Gonzo

http://s1000.photobucket.com/albums/af122/Gonzo1970_bucket/Tuning/?action=view&current=tune002.mp4

There it is!

I was hoping someone linked that.. Somehow I missed this thread when it was originally ressurected.

-Gonz

 

[LBell1987]

thanks, i'm having the same problem on cold starts. This helped a lot. messing with the A/F screw tonight

 

[desert rat]

LBell
Are you on the base or in North Edwards? I'm in Cal city on the weekends most of the time...not going home this weekend. Willing to give you a hand on you bike if you need it. To adjust the stock air fuel screw you will need a 223 case or 22 case with a flat spot in it (like a D) there is not a slot like a normal screw.

 

[LBell1987]

LBell
Are you on the base or in North Edwards? I'm in Cal city on the weekends most of the time...not going home this weekend. Willing to give you a hand on you bike if you need it. To adjust the stock air fuel screw you will need a 223 case or 22 case with a flat spot in it (like a D) there is not a slot like a normal screw.

I am on base.

 

[desert rat]

I will be home in three weeks if you need any help. I'll pm you my cell #