26-05-2018, 06:17 PM
John, your set-up sounds very similar to mine - I'm also using 1.25" SU (AUD13) with an AN needle & an SU pump.
I'm not sure it's optimal but it certainly runs OK. Yes, always choke from cold (by which I mean cold engine, regardless of weather). It needs a bit of a warm up before you can let the choke out. However once warm I've never had a problem starting. In fact hot or cold one swing of the handle is all it needs. I seem to recall setting the mixture up by taking it for short drives and inspecting plug colour on return - that was years ago though when petrol was petrol.
If the plugs are normally black (and it's not oil) then you are running too rich. Make sure you've done a few miles though before checking or they'll still be black from running on choke. Should be a sandy colour.
If I have engine starting or running problems the ignition system is always my first port of call, and points are top of the list.
I'm not sure it's optimal but it certainly runs OK. Yes, always choke from cold (by which I mean cold engine, regardless of weather). It needs a bit of a warm up before you can let the choke out. However once warm I've never had a problem starting. In fact hot or cold one swing of the handle is all it needs. I seem to recall setting the mixture up by taking it for short drives and inspecting plug colour on return - that was years ago though when petrol was petrol.
If the plugs are normally black (and it's not oil) then you are running too rich. Make sure you've done a few miles though before checking or they'll still be black from running on choke. Should be a sandy colour.
If I have engine starting or running problems the ignition system is always my first port of call, and points are top of the list.