Hi I have an old victa 2 stroke with no spark. The only number to identify the mower with is on the flywheel. It is MAo5338a. I took it to a mower centre and they had it running good. I did one mow and now it wont start. They said all they did was clean the points. Do I need a tool to get to the points. I have yet to change the plug. There is no spark. any ideas? thanks jesse