OK, so the igniters good, the plugs good and the fuel is flowing freely but it still won go – what now?
The most likely thing is that you’ve set the mixture wrongly. This is done by screwing the needle valve in or out. As a general rule of thumb, the needle valve should be set to about 2 1/2 turns out from fully closed, but it must be emphasized that this varies a huge amount between engines, but it is a good ‘starting point’. Keep trying the engine while adjusting the needle valve from this point, first screwing it in and then by screwing it out. A danger of trying to start the engine while playing with the needle valve is that you end up flooding the engine which makes it impossible to start. Fortunately there’s a very obvious tell-tale sign of a flooded engine; it’s very difficult to turn over. If you think this may have happened, disconnect the fuel line from the carburetor and turn the engine over by hand or with a starter. Alternatively hold the model upside-down and tilt it to see if any fuel comes out of the carburetor. If you still have no joy, I highly recommend a visit to your
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