how can i fix my westwood t1200?

Hi,
Does it start off the pull cord?
If so, you can assume that the engine and fuel system is ok.
Remember to fully depress the brake/clutch, otherwise the starting electrics are inhibited.
Assuming all these things, my bet is the battery. Even a re-charged battery showing around 12volts will not have enough kick (amperage) to power the starter motor. Best way to check this before spending £40 or £50 on a new battery is to try jump leads from your car battery when it is running (the car).
I checked and double checked the wiring on mine and also charged the battery but it still didn't have enough grunt to get it going. If you hear a clicking noise from around the battery area when you turn the key I would be pretty confident that this is your problem. A new battery actually chucks out around 13 or 14 volts and plenty of current (amps).
Give the jump leads a go first.
Cheers
Matt

Matty
June 2009