if your gonna keep the bike mostly stock,,,t6's are a good choice,,,if you plan on porting and carbs, reeds, adjustable timing plate,,coolhead,,etc. toomey t5's respond much better to higher mods,,,i'd go with the t5's personally,,,,i run klotz super techniplate,,burns clean,,,doesnt smoke and smells super great,,,i also ran belray for many years without ever loosing a topend