Carb staying on high RPM after accelerating.

[dustymojave]

Most every modern factory fuel injection throttle body comes equipped with 2 return springs on the throttle shaft. No matter what country they come from.

Stock dual springs are acceptable for Off Road race Tech.

The setup in the photo above would pass in terms of having dual springs. But if I found that on a race car, I would tell the racer to fix the interference before I would accept it for race.

If the old roll pin is made of brass, it can be drilled out. If the old roll pin is steel. it might be difficult to drill out without making a mess of that part of the carb body. I had a carb years ago that the roll pin wobbled a while before it fell out. It left a big hole. So I drilled it a little larger even, then used a larger roll pin with a little rat tile file work in the slot in the fast idle cam so the cam would come back to the proper point.
_________________
Richard
Offroading VW based cars since 1965
Tech Inspection 1963 - 2012 SCCA/SCORE/HDRA/MORE/MDR +
Retired from building Bajas, Fiberglass Buggies and Rails in the Mojave Desert. Also Sprints & Midgets, Dry Lakes, Road Race cars. All types New and Vintage
SoCalBajas Member
Kicked Cancer's A$$...1st and 2nd round...Fight ain't over yet.

[Bub II]

Ok, I figured out my choke element is ok. It was either assembled incorrectly, was adjusted incorrectly or it shifted after it was initially set?
I’ve set it temporarily and will further fine tune it as I get time.
I think the old Roll pin is broken off, so I will hope it is brass so I can drill it out.
Seems like a brass Roll pin is a lose/win situation, lose because it breaks, win because it might be possible to drill it out. Is there a reason a steel Roll pin wouldn’t be a better option?
Thanks for the info!
_________________
Enjoying life one day at a time.

[andk5591]

[Bub II]

I thought it was odd that mine was broke or missing.
When I did a general search for replacing carb choke Roll pin - the first YouTube video that popped up was about replacing a missing carb choke Roll pin. 😂
Where is the best place to buy a brass Roll pin if I’m able to drill mine out?
Thanks.
_________________
Enjoying life one day at a time.

[Dale M.]

Not sure if brass roll pins exist, all I have ever seen are steel...

Might use a piece of brazing rod (dowel pin?) or even a "screw" in place of roll pin... After all it just keeps lever indexed..

Dale
_________________
“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.

"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ...

[Q-Dog]

I do believe the roll pin is steel. I seem to remember seeing them with rust on them, but I can't remember ever removing or replacing one. Can't see any advantage to brass and it would seem to be too soft.
_________________
Brian

'69 Dune Buggy
'69 Beetle Convertible
'70 Beetle

[dustymojave]

I've encountered Solex carbs with steel pins and others with brass pins. The brass pins were solid rod, like 1/16" diameter. Brass pins are probably hard brass (not all brass is all that soft).
_________________
Richard
Offroading VW based cars since 1965
Tech Inspection 1963 - 2012 SCCA/SCORE/HDRA/MORE/MDR +
Retired from building Bajas, Fiberglass Buggies and Rails in the Mojave Desert. Also Sprints & Midgets, Dry Lakes, Road Race cars. All types New and Vintage
SoCalBajas Member
Kicked Cancer's A$$...1st and 2nd round...Fight ain't over yet.

[Bub II]

I finally got a minute to drill out the old Roll pin and replace it with a steel roll pin.
It totally fixed my original issue.
Now it starts, idles, returns to idle properly after rapid acceleration and then backing off the throttle pedal.
Thanks to all for your replies and especially the pictures.
As they say, a picture is worth a thousand words and the pics definitely helped me zero in on the problem location.
Now I need to unsnarl the wiring for the lights 😜
_________________
Enjoying life one day at a time.

[Bub II]

I finally got a minute to drill out the old Roll pin and replace it with a steel roll pin.
It totally fixed my original issue.
Now it starts, idles, returns to idle properly after rapid acceleration and then backing off the throttle pedal.
Thanks to all for your replies and especially the pictures.
As they say, a picture is worth a thousand words and the pics definitely helped me zero in on the problem location.
Now I need to unsnarl the wiring for the lights 😜
_________________
Enjoying life one day at a time.