Hi.
If you want to wake the beast up by doing some bolt on soft tuning, without dismantling the engine, you can gain more or less 10-15% of power, lets say 2-4 horsies killed by the primitiv carb, plugged exhaust and the old-fashioned ignition. But do not expect miracles. It is just the pleasure to get it done.
- electronic ignition: external module helping the points and removing the condenser or pointless module in the dizzy or Hall pick-up with external module. Iridium spark plugs plus propper ht leads.
- single barrel 30 or 32mm carb with acceleration pump (good enough for bolt on tunning). Progressive two barrels Panda 30/Bis type carb. Or the macho double barrel 40mm Dellorto DHLA/Weber DCOE - really expensive, but with a high level of satisfaction and wow effect, even over a single inlet port head. Also no one could tell you the correct jetting for any carb you choose.
- make sure to find a silencer that will perform well. According to many fans, the ones on the market are OK only for manish sound, even the Abarth Record Monza, the best looking pipe.
Have fun!!!