Wynn on his vintage TY80

 vintage Yamaha TY80

My son Wynn on vintage Yamaha TY80

The basics of Internal combustion are simple, if an engine has fuel and a spark, it should run, so when Wynn’s 1975 TY 80 refused to start, The first thing I did was check for gas in the tank. There was plenty of fuel so I ruled that out, leaving the electrical system the likely culprit. I removed the plug from the cylinder, stuck it back into the cap and grounded it on the cylinder head. When I jab at the kickstarter, a bright, blue-white spark should snap between the electrodes of the plug. I kicked it over but no spark. Was the problem as simple as a bad plug which could be easily and cheaply, be replaced or was it something more complex?

I remembered a trick my father had taught me. While repairing a lawnmower he called me over and asked me to hold the sparkplug wire. Not knowing about such things at the time, I obliged. Dad yanked on the starter cord and I recoiled as an electrical jolt ran from the wire, into my fingers and up my arm. Dad thought it was pretty funny and after a while, so did I. Some time later, while working on a rototiller my father called me over, again, to hold the sparkplug wire. I’m not sure if he had forgotten about pulling that trick on me before or if he didn’t remember which of his three sons had fallen for it before, but I walked over and took hold of the wire. We were both smiling as he pulled the starter cord.

Back to the present and troubleshooting Wynn’s bike. I removed the plug and remembering Dad, stuck my little finger in the cap and jabbed at the kick lever again. This time there was no jolt, not even a tickle.This confirmed there was indeed a problem in the electrical system. It could be the coil, the points, the condenser, a short or a broken wire.

As a teenager, I had learned to do many motorcycle repairs out of necessity. The bike shop was far away and I could barely afford the parts let alone the labor. If I wanted to ride, I had to fix it myself. I’d order parts from the shop by telephone (rotary) and had them delivered C.O.D. via U.P.S. I could install chains, sprockets, tires, cables, pistons and rings. If it was just a matter of removing the worn or broken part and bolting on a new part, I could handle it. My Achilles heel was, and continues to be the electrical system. If a new sparkplug doesn’t fix it, I’m stuck. Time to find a bike shop.