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HS-2 bugeye carb woes

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M

Mike_A

Freshman Member
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Putting my bugeye together after sitting about two years.

I have HS-2 carbs on a 948 motor.
Did the whole carb tune process except for using a feeling gauge between the heat shield and throttle pick up. Don't understand that one.

ANy way my car idles too high when I come to a stop.
IF I'm dring around and before I stop I slide it in neutral it's idleing at 1500 RPM.

If I let the motor stay in gear and come to a stop and push in the clutch at the last minute then it idles low.
Anyone run into this?

Mike Sacto
 
Hello Mike,
I don't know what you are refering to regarding the heat shield setting.
The first check is to ensure that the choke fast idle cams are clear of their adjusting screws with the choke pushed in. (and to be sure that the jets themselves are returning fully home into the jet securing assembly.)
There should be some free play between the interconnecting throttle bar and the forks that the pick up levers on that bar actuate when at idle. The book setting is 1\32", that is there should be a small amount of movement in the throttle cable before both the individual throttle shafts on the carburettor move and both should move at the same time.
If both those points are OK, you may have a piston or pistons sticking; with the air cleaner off (engine switched off), you should be able to lift the piston with your finger and release and the piston should slowly drop down and come to its lowest position with a faint 'click'. If not then the jet needs centralising.

Let me know how you get on,

Alec
 
Hey Alec

When you say "and to be sure that the jets themselves are returning fully home into the jet securing assembly" are you talking about the needles? Make sure the needles go into the jet securing assembly?
Also when you centralize the jet are you centralizing the needle?
 
Hello mike,

no, the jets are in the base of the carburettor and are held by a securing nut. When the choke is pulled the jet tube moves down in the carburettor base which gives a rich mixture. The securing nut is designed so that there is some lateral movement of the jet tube until the nut is tightened.
If the pistons drop down and you can hear them stop with a click then the jet is centralised. If not then the needle is binding on the jet and the jet securing nut needs to be slackened, the piston pushed down fully and the jet securing nut re-tightened. (Adjust the jet tube stop fully up to do this. That is with the top of the jet flush with the bridge. then re-adjust the jet two full turns down from flush. This is the basic setting and should be pretty close to giving a
correct mixture.)

Alec
 
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