Johnson Service Bulletin SB-891 - Accessory Throttle Control

February 19, 1962. Johnson describes a removable test-tank throttle control for remote-control engines, including Stevens Experimental Company part S-25.

Johnson Motors Service Bulletin letterhead
February 19, 1962
Bulletin No. SB-891
SUBJECT: Accessory Throttle Control for Test Tank use.
Original factory Figures 1 and 2 showing the throttle control and its installation
The absence of a steering handle, due to the use of remote controls exclusively, has made test tank throttle operation a little awkward on electric starting engines.
FIG. #1 illustrates a throttle control adaptable to the remote control fittings used on all our engines. This throttle control provides throttle operation as well as a positive throttle lock by means of a wing screw in the
trunion for engine break in and warm up before carburetor adjustment. This throttle control is also useful in engine testing on a boat as it eliminates the continuous run- ning back and forth from the remote control box to the engine, or the necessity of a second man to perform this task.
FIG. #2 illustrates a typical engine installation. This throttle control is available directly from Stevens Experimental Company, 2015 Grand Avenue, Waukegan, Illinois, under their Part No. S-25. The price is $4.95 net - F.O.B. Waukegan, Illinois. Add 4% sales tax on shipment in Illinois.
JOHNSON MOTORS W. W. DeWees Service Department
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