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Honestly it shouldn't be much different. I don't exactly remember, but it should just have the same amount of bolts as the long case roketa , it's the same engine just ours looks a little different.

Only 2 hoses should be coming from the gas tank, the fuel line and the vent hose. The vent hose has to stay open . If it won't stay running with it open then you have an issue somewhere else. I'd say your getting too much fuel or not enough air flow at the carb. If you clamp the vent hose , your restricting the fuel flow to the carb , and if it actually runs better clamped , then I'd say your def either not getting enough airflow to the carb or too much fuel . Possibly even a stuck float valve in the carb bowl.

Update: I ended up buying a bored out engine case and doing a new 63mm build bc I had a bad oil leak and I also had a cracked piston skirt after the last one. I went with the new Roller rocker arms , taida high torque starter, 18:36 gears, another new stock crank , 15 gram roller weights , taida variator and clutch assembly, oil cooler and I ordered a koso temp gauge . I also bought a set of wider and taller 100/90-14 tires, just have to put them on yet. This thing runs great , I also switched from a junk cvk carb to a maikuni flatside. The throttle response is so much better along with the throttle range . No more dead throttle spots and so much more throttle on the big end. I clocked it at 72 mph at 5,000 rpms and had to slow down bc I had a car in front of me. I used my phones gps speedo app so I knew it was accurate. I weigh a good 225 and I'm sure this thing will hit 75mph .

I have a blue one and a black one. The blue one has a 63mm BBK build with a bunch of other mods. I actually just recently finished it. So far I've hit 72mph on my GPS speedometer then I had to slow down bc a car was I front of me . I'm concerned about engine Temps, I already hit 210 degree oil Temps. My stock ran about 170-190 degrees . I have an oil cooler so I'm prob going g to have to install it.

Have you disassembled the clutch to inspect it?