Thanks guys, I will check the teeth and bar to see of that solves the problem.
Regarding starting difficulties, I know of one mechanic who used to warm the air intake of diesel engines using a hot air gun to help starting. Might work on petrol engines too? He used to avoid squirting 'Easy Start' or similar because he reckoned the burning of these in a high compression diesel engine would cause damage to the rings and cause lower compression, This then meant difficult starting from then on and so required Easy Start all the time when cold. Same applies to using petrol to start a Diesel engine.
K