Re: 1932 Johnson K-50 Starting

[Anonymous]

I had the same hard starting problem with my K50. As stated earlier if the center main has too much clearance the motor will not start. On an alternate firing twin that has too much clearance, the fuel charge will not be delivered to the spark plug. The way I fixed mine was to replace the crankcase with a later KA38 series one the had rings to seal the center main. The result was a great running motor. All A50 and K50 motors that have some run time and have a worn center main will have this problem. Running a 8 to 1 mix with 30 or 40 wt = Shell Aviation 80W oil may help to seal the center main.