That's not the ST motor he has. That's a 4 stroke and developes more pressure in the exhaust than an ST 2 stroke. The ST might work off muffler pressure but it also might not. You'll just have to try it out.
ORIGINAL: gjeffers
you dont need to drill for the cline, it works off the muffler pressure and utilizes a check valve in the pressure hose to the tank. here is my setup.