Righto, first things first.
For us to find the manual, we need the Model, Type and Code numbers off the engine, so that we know exactly what we're dealing with.
When you say 'won't start', does that mean that it still cranks over OK; but won't fire at all, or fires sometimes but won't keep running?
I'll get the numbers in the morning

Yeah it cranks over fine but won't fire and continue firing/running.. it fires very occasionally but only for a second and then back to just cranking over
Thanks for the reply