YY250T-2 Valve clearance and timing marks?

[tchavera]

Hey guys I am resealing the engine on this 250cc and can't find the proper timing marks. I see what I think it is but I'm not 100% sure. Having a hard time finding legit information on here. Also, I want to check the valve clearance. Does anyone have any information on the proper way to do it and proper valve clearance. I would appreciate any help