Is it aircooled 600 or watercooled 650?
The 650, as already mentioned, has basically the same engine as the f650 but with a different head.
The 600 pegaso is a totally different, and very rare, animal and does have a cambelt. I think they only made them for a year or so before going up to the 650. I had one for a while but I it was older than yours. The best place for info on that one would be ccmriders.co.uk. as the ccm 604s use a version of the same engine. The bore/stroke and cam specs are slightly different on the ccm but the procedure for changing the belt and adjusting the valves will be the same.
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