Trial Fitments
Counter Sprocket / Chain clearance

test-fit-1.jpg (16877 bytes) Here you can see the basic relationship between the frame and the motor. Note that I am placing the swingarm pivot tube as close as possible to the counter shaft sprocket. Motor mounts, when placed, will help triangulate between the swingarm pivot tube and the lower horizontal tubes. There are two motor mounts, one just behind the counter shaft sprocket and another on the top of the gear case.
test-fit-2.jpg (14893 bytes) A view from the rear. Notice   slim clearance between the counter shaft sprocket and the frame tubes (lower left). Chain clearance  may necessitate the offset mounting of the motor slightly to the right. What affect this will have on the over all balance of the bike is yet to be seen. Ancillary components could be offset to the left to compensate.
Motorfit-2.JPG (23568 bytes) Now the motor is hanging from the top two motor mounts which are attached to a frame cross bar just above the motor. None of the mounts are welded at this point because I still have to construct the lower motor mounts which attach to the swingarm pivot tube. The mounts are made of 1/4" thick mild steel attached to a 3/4" x .049 CrMo cross bar tube. The engine case will form a stressed member triangulating between the swingarm pivot tube and the main frame members.