ORIGINAL: checkmate91
Hurrah, will ping bax about this engine. My version, for information, came from one of my club colleages and it is not the same as my 40 LA. Two key differences 1. extra exhaust port, 2. dual needle carb, the LA has the open hole air bleed type carb. Otherwise bushed bearing crank etc is the same.
Then it's not the original carb. All the FP models were air-bleed.