Carter BBS Slant 170cui idle problems

[Bugman]

It's hard to see but there's a spring in there pushing against a check ball, the vacuum or lack of vacuum will seat or unseat that ball, that part not adjustable

View attachment 1715708270

Here's a blow-up of Carter's image

 

[Bugman]

Before I forget removing that cover plug above that screw will not create a vacuum leak

 

[Bugman]

Before I forget removing that cover plug above that screw will not create a vacuum leak

 

[Bewy]

It could be getting too much fuel at hot idle [ too rich ] ...or too lean. Both can cause stalling.

Too rich.
- needle & seat not sealing or leaking.
- wrong float level
- float not 'floating'. Internal leak & it sinks.
- float binding on pivot or something else.

Too lean.
- blockage in idle cct such as accumulation of dirt/sludge

 

[Schyrjajew]

That spring is a tension spring so that screw will stay in one spot turn clockwise lightly seated no air flow into idle circuit. Turn counterclockwise unseats taper lets air in to idle circuit; this is adjustable , my first assumption was incorrect

View attachment 1715708313

Thank you very much for the informations. i will check it

 

[Bugman]

Thank you very much for the informations. i will check it

 

[Bugman]

The easiest way to check that it's just block off that external hole with cardboard. Complete disassembly not recommended, I did it to take pictures. That brass cylinder is a press-fit if that screw is snug down to tight whole thing could fall out of there.

 

[Bugman]

The easiest way to check that it's just block off that external hole with cardboard. Complete disassembly not recommended, I did it to take pictures. That brass cylinder is a press-fit if that screw is snug down to tight whole thing could fall out of there.

 

[Bugman]

That Ridge measures about .404 presses into hole about .385

 

[Bugman]

If it should fall out wrap some plumbers tape around it and tap it back in there. The tape is visible in the picture.

 

[Bugman]

 

[Bugman]

Here's some specs and part numbers for your carburetor

 

[Bugman]

Your idol orifice tube assembly part number 123 - 88s hole size .033 or close 0.85mm second colum by red dot

 

[Bugman]

 

[Bugman]

View attachment 1715708644 View attachment 1715708644 View attachment 1715708644

 

[Bugman]

carter manual my apologies about multiple images being the same

 

[Bugman]

carter manual

 

[Bugman]

At bottom of tube is jet

 

[Bugman]

 

[Bugman]

Green is Idle Jet tube black idle air bleed

 

[Bugman]

Green is Idle Jet tube black idle air bleed

 

[Bugman]

Black Arrow Is idle down channel to idle screw red lines are hidden cross-channel, at the end of red lines next to idle to that black line is where the restrictor is. The blue is where the adjustable idle air bleed feeds to the idle circuit

 

[Bugman]

That drill bit follows the cross-channel idle circuit that aluminum plug just below the drill bit is the cleanout plug

 

[Bugman]

That drill bit follows the cross-channel idle circuit that aluminum plug just below the drill bit is the cleanout plug

View attachment 1715708796

 

[Bugman]

Here's the last page of that Carter idle circuit description where that red X is that does not apply to your car that's strictly 1968