06-09-23, 09:08 PM
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Member
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Join Date: Jul 2008
Location: Sydney, Australia
Posts: 423
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Michael ,
SU carburettors are a simple and effective , if the butterfly shafts and bodies are not worn they probably only need a gasket set and setting/checking the float levels during the tuning process.
The choke device on the front carby bowl is trouble free. Don't touch the adjustment of the needle and make sure the solenoid is operating , it should work perfectly .
There is one problem with that front float bowl, SU and BAC selected the wrong type for the 85A and 85B engines. The one used is LL3258 which is a low level bowl suitable for side draft SU and when you set the fuel level using a 3/8 rod as per the manual the fuel level of #1 carby is way too low(from memory nearly 1/4 inch). To raise the level I suggest you reshape the brass bridging fork making it a bit flatter, this will raise the level close to #2 and #3 carby fuel level .
I recently bought a used high level HL3255 front bowl but have not as yet had it operating on an engine . Reshaping the fork of the LL3258 gets the level very close to #2 and #3 so it should be sufficient to get the engine running correctly.
Geoff
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