Originally Posted by
retired2pa
I have a Mercury machine that needs a new belt. How do I know what size I need? I don't have the old belt.
Thanks.
go to the sm shop and buy a 13-5/8 and keep the receipt, try it, too loose, exchange for the next size down,...
you get the idea. But actually wrap the pulleys with something like a clothesline rope, and make 2 marks where they overlap, unwrap and measure.