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Two stroke engines, other than lawn equipment, are something I don't have a lot of experience with yet. However, when you are trying to return something to stock or to improve its performance, the best way is to do one thing and test it. Then either accept the change or modify it to continue in that direction until it starts going worse from the last change. Then proceed to the next thing. Not try to do it all at once.
On the rollers you need 6 total, do you only have 3 now?
Holes in the exhaust being welded, increase restriction, removing welded restriction opens it up. Burning out the exhaust MAY cleaned the more liquid portion, but now you have soot- how are you dealing with that?
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