Brother's, 300lbs, 45hp, Japan/Great Britian only. The fuel shut off was leaking badly. The fuel shut off is accessible to the rider and is like a vacuum petcok. But the tank has an on/off petcock that requires tank removal to access. I flat sanded the diaphragm mating surface which improved things. The pri/on/res mechanism got cleaned up and measured. Reassembled, cut fuel hose back 3/4 inch to unspoiled hose and all worked good. Idle and main Circuits are probably gummed. I added a healthy dose of naptha to the fuel and ran it a bit on enrich then off, on again, then off. It will sit overnight. Carbs are on the front of the engine with convoluted plumbing to the airfilter under the front of the tank. Exhaust straight out the back of the block to cambers under the seat tailsection. I rode this year's ago. The power valve motor pulls decent to 6 grand or so then gets exciting to 11500.