The inlet is restricted, carb could be 10/12mm should be 16. If the inlet is rotary the opening is too small, if it has a normal inlet there could be a bushing pressed in there.
Edit: And the exhaust bend is probably 28mm, should be 32mm. (edited)
The inlet is restricted, carb could be 10/12mm should be 16. If the inlet is rotary the opening is too small, if it has a normal inlet there could be a bushing pressed in there.
Edit: And the exhaust bend is probably 28mm, should be 32mm. (edited)
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