Eventually got my 850 Commando 1973 running. Only on full choke. Tried unscrewing air screw, out 1.75 turns, now only runs half choke. Any ideas?
Something blocked. When did…
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Are you operating the air…
Are you operating the air slides in the right direction?
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Surprising how often this…
Surprising how often this happens. Does nobody read the instructions?!!.
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If the carbs haven't been…
If the carbs haven't been used for a while the pilot jets can become blocked - the only way to clean them properly is to poke a 16g drill through them ( or a single strand of clutch cable), having removed the pilot air screw. Just blowing through with an air jet won't work.
John
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The bike that initially…
The bike that initially confused me most in starting was a BSA M21. Ignition advance retard lever, air lever that you pulled tight to open air (i.e. normal running) and a decompressor. The saving grace was that it was relatively easy to kick over even if you didn't get the piston positioned just right. After trying many bikes at the Try a Classic events at the NMM I realised what I really wanted was a twin cylinder bike - much simpler for me to start.
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Some BSA singles had tight…
Some BSA singles had tight wire advance.
Probably confuses some people and also retards itself as you ride down the road.
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As did....
... some Norton singles - the ones which had the inlet cam driven by the exhaust rather than directly from the crankshaft pinion.
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Something blocked. When did you last clean the jets?