Bullie
Petty Officer 1st Class
- Joined
- Dec 20, 2014
- Messages
- 300
I picked up a 1992 Yamaha 25 today that has erratic spark on the top cylinder and no spark on the bottom. I had my tester set to about 7/16ths. Compression tested at 121 and 119. Problem with the coil is my uneducated guess. What should I check first?