I have about 500 miles on '05 Sporty with a vanilla 1200 conversion (SE 10:1 pistons, SE cylinders, SE 1200 ignirion module. rejetted main with part # 27185-90 - don't know other number). Idle is solid, power increase is excellent, and there are no backfire, carb fart or other issues. That said, the engine seems to be fighting itself throug the rev range. Before conversion, the 883 with Stage 1 (SE II exhaust, SE A/C and rejet) seemed to rev more freely. The engine just feels rough. Is this the nature of the 1200 engine, or could it be a timing or jetting issue? Your thoughts will be appreciated.