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First, using a test light or multimeter, check that when the ignition is on the wire at the choke element is live.
Assuming you have power there, check the element functioning...
With a stone cold engine, press the accelerator fully and release it, this sets the choke on with a cold engine.
Do not switch on the ignition at this stage. Next, take the air filter off and look at the choke cam and choke butterfly...
A small gap in the choke butterfly (3-6mm) is normal.
Next with a HOT engine (15+ minutes running), switch it off and remove the air filter and go and look. It should hopefully look like this... Beware of hot components (!)
Adjustment are made by loosing the three screws on the side of the element (do not remove them, just loosen them a turn or so) and turning the element slightly. Remember to hold the throttle lever well clear of the cam when you are adjusting it.
Notes: when the elements get old they can get sluggish and do not operate fully. The only option is to replace them really when this happens.
If nothing at all happens, carefully remove the three screws and the ring and pull the autochoke out. You will notice that there is a bi-metallic coil inside with a square hole in the end. This needs to engage on the pin in the carburettor properly.
There are normally also two marks to help with initial adjustment but you may have to tweak it one way or another slightly to get the best out of it.
Assuming you have power there, check the element functioning...
With a stone cold engine, press the accelerator fully and release it, this sets the choke on with a cold engine.
Do not switch on the ignition at this stage. Next, take the air filter off and look at the choke cam and choke butterfly...
A small gap in the choke butterfly (3-6mm) is normal.
Next with a HOT engine (15+ minutes running), switch it off and remove the air filter and go and look. It should hopefully look like this... Beware of hot components (!)
Adjustment are made by loosing the three screws on the side of the element (do not remove them, just loosen them a turn or so) and turning the element slightly. Remember to hold the throttle lever well clear of the cam when you are adjusting it.
Notes: when the elements get old they can get sluggish and do not operate fully. The only option is to replace them really when this happens.
If nothing at all happens, carefully remove the three screws and the ring and pull the autochoke out. You will notice that there is a bi-metallic coil inside with a square hole in the end. This needs to engage on the pin in the carburettor properly.
There are normally also two marks to help with initial adjustment but you may have to tweak it one way or another slightly to get the best out of it.
