Hint1:
When  removing the cylindern it may be stucked hard. Do not try to loose it with a screwdriver or a hammer. The colingfins are easyly broken. The solution is to slacken the screws to the rotary disk valve cover.

Hint2:
All nuts and bolts on engine has BSF (British Standard Fine) thread. Be careful not to lose any. They are unusual. Screws holding tank and rear end of exhaust system are easly lost.

Hint3:
The German Cyclemaster has nuts adapted to millimeter spanner grip, while the English has BSF (British Standard Fine) spanner grip. BSF tools are rare. Cylinderhead nuts and front engine hold (1/4" BSF) = 10,5 mm spanner grip. Do not try to force a 10 mm socket over the nuts. They will be damage. There are long hexagon sockets with 10mm opening in one end and 11mm in the other. File the 10mm end to 10,5mm with a small file.
Flywheelnut and  clutcharm nut has 13,5 mm size. Do the same with a 12-13mm long hexagon socket..

Hint4:
Do not use gearbox or transmissionoil for cars. It contains a lot of additive that will cause your clutch to slip. Use transmissionoil for 2-stroke motorcycles with clutch running in oil.  Castrol MTX seems to work all right.

Hint5:
Both  transmission and second chain has dimension 3/8x5/32". A suitable lubricant is "CRC Ahdesive lubricant" for second chain. It  stays on chain and will not make the drum dirty inside.

Hint6:
To avoid scratching the drum and tankpaint when mounting wheel on bike, you can place a towel between the spokes on top. Let the towel hang down on both sides, over the back of drum and over the tank and prevent the rear forks to damage the paint.

Hint7:
Make sure to strech the chain from pedal sprocket to wheel sprocket. If it is to slack the chain will rub of the paint of the drum.

If there is any incorrectness in this site, please tell me.