Ok so cleaning up the flaws for smoother flow in the flange nipple like I did is the way to go.
I cleared the casting flaws in the intake and exhaust ports of the head and port matched the intake and carb.
For the exhaust pipe the muffler was already gutted except for a weird homemade spark arrester that had been wired in that I removed.
The exhaust header has a small nipple that sticks out of the pipe that the little round gasket sits over. On that I just cleaned up the ridge that was running down the middle and smoothed it out inside the pipe. Didn't make it bigger.
I will plan to leave it alone then.
How much power difference is there between the 58.5 mm155cc cylinder and the 61 mm cylinder ?
May start picking up the pieces to build a complete spare. After I get things squared on this one of course. Would be a good winter project.
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Where there is a red neck there is a way.
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