The K&B .67 outboard owner guide is available online at
http://www.mecoa.com/kb/67/5101.htm and I have copied the basics below.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The carburetor enables easy adjustment of the idle speed, idle mixture and the high speed mixture.
1. High Speed Needle Valve
Locate an area to install the Remote Needle Valve assembly using the bracket provided. This may typically be attached to the firewall, cowl or rear engine mount lug area. This assembly must be in the fuel line between the tank and the carburetor. The line should not exceed five (5) inches in total length.
2. High Speed Needle Valve Adjustment
This needle valve, located on the Remote Needle Valve Assembly, controls all the fuel that comes to the engine, whether the engine is running at high, mid-range, or idle speeds. It does not affect the low speed rich/lean setting. The High Speed Needle Valve’s main function, however, is to meter the high-speed fuel mixture.
As a starting point for the High Speed Needle Adjustment, completely close the needle valve (clockwise), then open it (counterclockwise) three and a half turns. This setting is an average and may require further adjustments. For higher altitudes (3,000 - 4,000 feet), close the needle valve approximately 1/2 turn.
3. Low Speed and Mid-Range Adjustment
The rich/lean adjustment is controlled by the brass low speed disk located on the side of the carburetor. Using the allen wrench provided turn the disc clockwise to “lean” the mixture and counterclockwise to “richen” the mixture. The rich/lean mixture control is set at the factory and may require only a fine adjustment for your application. WARNING: DO NOT RUN THE ENGINE AT A “LEAN” SETTING.