When you rebuilt the carb, did you completely disassemble it. My friend's 1450 had a similar issue when you ran the throttle up. It ended up being a dirty main jet. I pulled the jet and cleaned out the holes in it and now it runs great.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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