Topic: 78 Carb Question ??

[tmac]

Guys , My bike is all back together and running great but there is a vacuum tube or maybe a vent tube from my carbs that I really cannot find a place where it goes so there is a screw in it for now. MRieck told me to ask U guys your thoughts on the possibility of maybe a P.O. either changing the original petcock or if these carbs even belong on this bike. The reason for my question is I am having a cold start problem. Please advise & Thank You very much !!! Tim

[bollingball]

That small tube is a vent tube it should be open and you can strap it above the top of the carbs. If they pd42b's with the keyhole top cover. Is this a (K) model?

[Nikkisixx]

Yup, probably the vent tube. Route a line like ^ said.

For the cold start problem - did you adjust the fast idle on the choke?  Also: I have found that pumping the throttle a couple of times before hitting  the starter to squirt a little extra fuel helps stoke the fires as well.

[tmac]

Yes its a K8 & thank u

[cookindaddy]

My K8 PD carb vent tube has a small screen filter plugged into it, to prevent particles from getting drawn down the tube? I think that is original (the way they came from Honda).

[tmac]

Thanks Guys!!

[mick750F]

My K8 PD carb vent tube has a small screen filter plugged into it, to prevent particles from getting drawn down the tube? I think that is original (the way they came from Honda).

   Originally there is no screen in the carb vent tube. It would have to be a pretty small screen...The factory set-up had the vent tube attached to the top of the air cleaner by a clamp/bracket and hanging down behind it.

Mike

[tmac]

Thats how I put it back, Thank you very much!!

[BobbyR]

For cold start problems check that your choke is closing completely. There is fast idle cam, but that only comes into play after the motor starts.

[Nikkisixx]

For cold start problems check that your choke is closing completely. There is fast idle cam, but that only comes into play after the motor starts.

Hey BobbyR: After a rebuild I had hard starting problems with the fast idle set too high -4500 RPMs    - and I propose that with the slides open too far it changes the fuel/air mix too much and causes hard starts.  What do you think?