The cylinder is a 90, casting bosses to allow early style foot peg bolts. The main difference between 90 or 110 cylinder is there @ 1/4 inch longer and used a single bolt head stay plate. Plates can be swapped easy enough. Now as for the clutch, that's some red neck engineering, would be interesting as how its connected inside the auto clutch cover. I think the carb set up is just a bolt on.
"HJ"
’84 YT60
’85 350x (423cc) with ’81 XL500 head conversion
’83 XR500 (628cc) converted 3 Wheel hybrid
’73 CB750 K3 converted 3 Wheel hybrid
’86 TRX250R chassis XR650L engine hybrid
’89 TRX250R (stock )
’90 LT500 Quadzilla
’85 FL350 Odysses ( water cooled head )
Lost (sold) but not forgotten ’80 ATC 110 (205cc on alcohol ) ’83 200x ( 222cc ) ’83 200x ( 185s eng ) ’85 350x ( stock )
added to the collection recently, (2) '70 US90 Aquarius Blue and '74 ATC90 Daytona Orange