English | Deutsch ||
Delivery Destination:
|| Help

Installation advice idle speed levers SU HS6

21.02.2024

Details for the installation of the idle speed levers on the SU HS 6 double carburetors. Since some details were changed in the long production time, some minor adjustment might become necessary. The levers fit right out of the box on carburetors from recent production.


To prevent damage while working on the parts, you should always remove the parts you want to work on from the carburetor. To work on the levers, when attached to the carburetor, is often impossible due to the limited amount of space, in consequence you may damage something.
The idle speed levers on the carburetor have these functions:
- Eye for the return spring
- Thread for the fast idle screw
- Stops for the throttle valve and idle screw
- Stop for the full throttle position
The idle speed lever shown in the picture is two-part and from recent production. Originally the idle speed lever was one-piece like Skandix no. 1056746 and 1056747.
1) Eye for the return spring
2) Full throttle stop
3) Idle screw
4) Throttle valve shaft
5) Idle stop
6) Fast idle screw

The position of the throttle blade screw in the cast of the throttle body of the SU HS6 might vary up to 2-3mm. It is impossible to relate this to the year of production. The lever works flawlessly on very early carburetors from the 60s and on the recently made ones too.


During the survey of the lever we however had a carburetor out of a car from 1965 whose year of production was not absolutely clear. This carburetor had the same type of lever apparently, but the full throttle stop of the new lever got caught on the idle screw. In this case the idle lever has to be taken off again and the full throttle stop needs to be shortened by 1-2mm. The lever will still have enough contact area.


Here you can see the contact of the full throttle stop with the spring.


Furthermore it might happen, that the fast idle screw will not touch the choke lever properly centered. The screw should touch the lever centered to prevent its rounded tip from uneven wear. This non centered contact might happen because the lever is bent, but there are also throttle blade shafts with different stop positions. 


To correct this you can bend the idle lever to the correct side. This should be done cautious and you have to take the lever off the carburetor to do this! Never bend the lever when it is installed to the carburetor! That may cause serious damages.
  • All notes serve only as an example and do not replace the workshop instructions of the automobile manufacturers! All information is supplied without guarantee!

Additional information...

  • 1056746: Idle throttle lever SU HS6 front
  • 1056747: Idle throttle lever SU HS6 rear