To lock the engine I find some starter cord down the plug hole is very effective, being nylon it won’t do any harm to the internals.from memory there is some holes threaded in the flywheel under the plate under the starter pulley to make up a puller, however last time after undoing the pulley I levered the flywheel with a pinch bar in line with the key way, placed a block of wood on the end of the crank and gave it an almighty clonck a couple of times. The shock should be enough to bounce the flywheel off.

You don’t need much pressure at all when levering, that’s how I’ve done a few anyway, otherwise, make up a plate with 3 holes, weld a nut into the centre one, and thread some bolts into the holes in the flywheel, then you’ve got a crude puller.
The starter pulley should just unthread, I find the nylon cord down the plug hole the safest way to lock the engine. When I’ve had really tight ones in the past I’ve had to resort to removing the head and placing a block of wood on the top of the piston, then temporally refit the head.
I’ve had a couple of the coils fail on me on this engine, and a couple of dicky carbs,but apart from that they are almost bomb proof. I can’t believe how thick the castings on the crankcase are, you certainly wouldn’t see engines like this nowadays.