Originally Posted by cymaz

Heads up 7-77 owners!
I ran my 7-77 a couple of weeks ago as it hadn't been run for a while. Did everything by the book as usual. Oiled the rockers and followers, drained the two lower cylinders. After the run, ran the engine dry, after run, span it over...you know the drill. Anyway, today got the engine to the field. Put on the prop, removed the two lower plugs to drain excess oil, turned the prop by hand.....dead stuck, no movement. Absolutely rock solid. Checked the rockers and push rods, all good.

Took the engine out and removed the back plate. The circlip holding the gudgeon pins retaining plate had broken into 3 pieces. The plate had dropped out, releasing all the slave connecting rods.

Now, I'm not the one to have a lot of luck. However, there was the bits of circlip sitting on the bearing. The only damage was a tiny nick on one of the piston skirts and a inlet tube.....phew!!

Please check your circlips NOW.....!

Anybody know where I can get the bits and new O rings please ????