Not 100% sure but I think all the 1100 and 1200 one's are the same. Mr Suzuki did make different sized ones on other models, I knows this cos I bought the rong one first time round.
One of the cams, helical crank, coil spring clutch like the 1100 slabby, sump, gear ratios O and they go like fook especially with b12 carbs fitted. There my favourite engine.
Just saying
You neen something like this if you have blocked the oil jets off up the stud holes. Take oil feed off main oil gallery up to the right hand side of the cams then round the back to the other side.
I still have a gt185 in the back of the shed where I left it after a mate holed a piston on it 36 year's ago. Someone did try to buy it off me recently. Never catch me hoarding stuff
A long time ago I put the return pipe to the carbs and the carb feed to the tank. Every time I opened the throttle it starved the carbs of fuel causing engine to shut down, as soon as I shut throttle away it went again. Live and learn lol.