Originally Posted by
beatsal
When I unscrew the compression screw, it seems as if it is free i.e. when I tighten the screw it reaches a point where cannot tighten further. Now, when I loosen from that point, it is free as if not connected to anything.
Before you try disassembling the engine to tap the contra upwards, try this:
Disconnect the fuel tank. Back off the comp screw a few turns so it's not touching the contra. Turn the prop to close the piston and squirt a decent prime into the exhaust. Turn the engine over at least twice by hand. Give it a hard flick. Continue till it fires. If it doesn't, continue doing this till it does. When it gives a burst it should drive the contra up. Continue till it's where you want it.