Think it's a 1970. Uses one coil and an amplifier pack. Has three cylinders. Checking plugs for spark... It's there but very small. When under compression, with spark tester, there is none. I'm thinking about buying the amplifier, but some dealers tell me this motor is a poor design. One said the dist. cap was bad also. I see no cracks in it, but the contacts are tarnished. Can they be resurfaced with metal brush? I am willing to put some $ in this up to a point because I've owned it forever and it really is low usage. What do you think?