Today installed the oil tank, brake pedal, shift pedal and rear drive chain.
I converted from 630 to 530 chain and sprockets, using JTF-338 (17) and JTR-284 (48).
The JTF338 has a shoulder on one side, I initially installed with shoulder out, but after installing chain, it was rubbing the engine case.
I then reversed the front sprocket with shoulder inside, no more chain rub.