Hi folks, just a question on whether or not I am following a correct fault diagnosis path.
The HM80 has not been run in over a year. Last time I used it it ran fine for around 20 minutes then cut out and would not restart. A day later I checked purely to see if it would fire and it did on first pull so I turned it off drained the fuel and put it away.
Today I had a lot of stuff to put through the machine. I put in some fresh fuel and it fire and ran from the third pull.
After about 20 minutes of running fine it stopped as if running out of fuel. After 20 or so pulls I gave up and decided to check a few things.
Fuel in the tank
Carb was getting fuel
There was spark
Plug burn looked perfect
Fuel was purchased less than 3 days ago
Magneto air gap was fine
Compression felt strong
I decided to check the valve clearances. They were minimal at best, about .005 thou. By specs exh is .020 and inlet is .010
I pulled the valves and adjusted them accordingly.
Could the valves being tight have caused the problems I experienced? I have yet to start and run the machine as I had to make a gasket up for the valve cover.
The valves looked good as did the seats and were tight in their guides. The bore looked excellent.
Hopefully I will get to run the machine by the weekend.
