22-06-2020, 06:40 PM
Sorted now, thank you.
I had forgotten that discussion about carb bowls. Changed it, no difference.
Checked to see if this was the carb I used before - I built and fitted the engine at start of lockdown, so have forgotten lots of things.
No, it was a bitsa carb put together to see if it worked.
Took it off, and, as Alan suggested, the butterfly wasn't closing by just a whisker, even though it was going as far as it could when the lever operated.
Undid one screw holding the butterfly, much to my surprise, they almost never want to move. Couldn't shift the other one, it will need drilling out.
Closed the butterfly, and the whisker of a gap went away - the thing had re-aligned itself.
Re-assembled, and now I have to adjust the idle up to stop it cutting out.
Result.
As an experiment I had used a silicon gasket between carb and manifold. Assembled, it was obviously sealing, Dis-assembled, it was all puckered up where the petrol had got to it and was sort of cup shaped, not flat. Bythe time I had made a paper gasket, put goo on it, and put everything back together, the silicon gasket had dried out and was nearly flat again.
Dunno what I have learned from that, but probably won't do it again. They do seal luverly, though.
I had forgotten that discussion about carb bowls. Changed it, no difference.
Checked to see if this was the carb I used before - I built and fitted the engine at start of lockdown, so have forgotten lots of things.
No, it was a bitsa carb put together to see if it worked.
Took it off, and, as Alan suggested, the butterfly wasn't closing by just a whisker, even though it was going as far as it could when the lever operated.
Undid one screw holding the butterfly, much to my surprise, they almost never want to move. Couldn't shift the other one, it will need drilling out.
Closed the butterfly, and the whisker of a gap went away - the thing had re-aligned itself.
Re-assembled, and now I have to adjust the idle up to stop it cutting out.
Result.
As an experiment I had used a silicon gasket between carb and manifold. Assembled, it was obviously sealing, Dis-assembled, it was all puckered up where the petrol had got to it and was sort of cup shaped, not flat. Bythe time I had made a paper gasket, put goo on it, and put everything back together, the silicon gasket had dried out and was nearly flat again.
Dunno what I have learned from that, but probably won't do it again. They do seal luverly, though.