RE: Been quiet on the ole conversion board..
Use a carb with an 11mm venturi. The Zama carbs fit the Super Tiger .90 conversion a bit better than the Walbros because they are a bit smaller physically, but a Walbro will fit. You might have to grind down one of the regulator cover screws. The regulator cover should go towards the engine, not towards the prop.
AV8TOR