Bonneville America Forums Forums Technical Forums Performance Mods carb overhaul 2003 BONN AMERICA

I HAVE A 2003 BONNEVILLE AMERICA
WHERE CAN I PURCHASE CARB REBULD KIT? KEIHIN CVK
ALSO I WANT TO INCREASE PERFORMANCE SLIGHTLY W/O REPLACING EXHAUST.
THANKS

You can drill the air tube in the slide slightly larger if you haven't already. Different springs on the slide will change performance as well. Rebuild kit should be available from a jap bike shop.

May I ask why you feel you need to rebuild the carbs? Is there a problem with the bike?

The 2003 was equipped with a 17 tooth drive sprocket. Switching to a 16 tooth will improve acceleration a bit without changing anything other than top end. You could also remove the 3 baffles in the air box which will allow a bit more air into the engine but to really gain some extra omph, the pipes should be changed or gutted (There used to be a guy that purchased stock pipes and gutted them then sold them for a lot less than new pipes or TORS). If you increase air flow, re-jet the mains at least, add a shim to the needles and remove the caps from the idle mixture jets and richen them. https://www.triumphtwinpower.com/ has a slew of options for the America to liven things up a bit. Air box bell mouth, ECM, jets etc etc.

The guy who gutted them was chevy605 on Ebay I think, easy to do yourself though. Gutting pipes and opening intake needs to go with jetting too though.

Just looked at the user list and he was chevy605 on here too, his profile has an email addy you could try if you want.