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As previously mentioned, there are two screens which may be clogged.
1. above petcock in tank. Measure flow-rate from petcock when vacuum applied to activation port. Flow rate will tell you if it's moving gas quickly enough to keep pace with carb demands.
2. other screen is inside fuel-line going to carb-inlet. Since it's so small, doesn't take much to cause restriction.
Don't leave anything to chance, remove both screens, inspect and blow them out backwards to clear.
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