If it is similar to an SP474 then it is relatively easy. Disconnect spark plug and remove blade and slide off the drive bush. The belt is behind a plastic cover - remove the cover (2 screws and one nut) and you can see the small drive shaft pulley. The hardest part is getting your hand in the small pulley compartment to drape the belt around the pulley. Having achieved that the rest is a straightforward re-assemble - I know because I did it only this morning.
Sam McComas
April 2011
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