I don't know this engine in detail, but we can make a few general statements. In that type of engine, lack of power can be caused by
- a bad spark (check spark plugs for gap and fouling, measure coil resistances, check plug leads)
- lack of fuel (weak fuel pump, blocked filter, blocked jets in carby)
- engine timing off spec (use a timing light to check this)
- lack of compression (use a compression gauge to check this)
Of all these, I'd start with engine timing, then look at a blocked jet in the carby.
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