I have Victa 2 stroke lawn mower. It's approx 15 - 20 yrs old. The other day i was cutting the grass and it stopped dead. The spark plug was foulded. I replaced the plug with a new plug. Still no spark. I took the top off and cleaned the points and re gapped it. I checked the spark once again but it was weak. The mower started. I would like to know how to check the coil and the capaciter. I have a Multi meter Thank you for any suggestions.