OK Try this. But before we start, are you sure your battery is fully charged?

1. Take the spinner off completely. Refit the prop without the spinner.

2. Turn the rubber thing in the electric starter around so the hole in the back is facing out. This way you can use the starter on the engine without the spinner.

3. Close the needle valve completely (go easy and don't jam it in tight).

4. Open it about 3 full turns (this is a gestimate as I don't know that particular engine).

5. Try to start again.

If this works, then the spinner may have been the problem or you may have had the needle screwed out miles too far.

If it does not work we continue the investigation.

You can also buy "spinner nuts" which are made of aluminium (or chromed brass if you need some extra weight) and screw onto the engine in place of the spinner and the normal nut. Very neat and work well.

Secondly, plastic backed spinners are best avoided. The ones with fibre reinforced black plastic are ok. The coloured plastic ones tend to compress when tightened and do come loose over time. They need to be checked regularly for tightness. Metal backed are better and all metal are the best but you do need to buy a special nut to fit on the engine for them.