PM T2 wrote:Did you have the powerhead completely torn down at some point? If so, did you measure the clearance on the ID of the centre main?
I think those motors have a limit of about 0.004" on that clearance. If its more, they don't like to start. Usual result is they'll start on a stand, but not with the prop wet.
ddwilson wrote:both my A50 and K50 have to set the mag above half way maybe 60 to 70% to start . also if has not been run for a while rock the fly wheel back and forth several times to make sure it has primed the cylinders . both usually start quickly that way
XR55 wrote: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.
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