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SPECIFICATIONS
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| Displacement |
.8155
Cu. In. (13.3cc) |
| Bore |
1.040
(26.42mm) |
| Stroke |
.960
(24.38mm) |
| R.P.M. |
2,000
- 23,000 |
| Power
Output |
4.2
H.P. @ 23,000 |
| Weight |
24.5
Oz. (695g) |
| Propeller |
P-255 |
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WARNING
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PLEASE
READ ALL SAFETY
INSTRUCTIONS! Failure to read, understand and follow
these instructions could result in personal injury and/or
property damage to yourself or others.
Take
a few moments to familiarize yourself with the various parts
of the engine. DO NOT DISASSEMBLE YOUR ENGINE! Doing so will
void your warranty. No exceptions!
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OPERATING
INSTRUCTIONS
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If
you are unfamiliar with this line of carburetors or are a
new modeler, please do not attempt to start the engine until
you have read and understand the following instructions:
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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 on
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 (counter-clockwise)
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 counter-clockwise 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.
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PRESSURIZED
SYSTEM
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| All series
“94” carburetors must run with exhaust pressure from
the pipe to the fuel tank. |
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PROPELLERS
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It
is difficult to recommend the propeller for your particular
boat, as much depends on the nitromethane percentage fuel
you may use. Propeller depth and strut angle are also important
factors. However, as a start, the following will have you
in the ball park:
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Hydros
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Prather No. 270 or Octura No. 467 |
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Deep
Vees
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Prather No. 260 or Octura No. X462 |
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Tuned
Pipes
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Prather
No. 9040 or Mac’s No. 1290 |
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ENGINE
OPERATION TIPS
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GLOW
PLUG: This
engine is designed to use the Long Reach Glow Plug (K&B
P/N 7311) or the H.P. Long Reach Glow Plug (K&B P/N 7300).
FUEL:
We recommend using K&B 1000+,
25% nitro.
HEAD
SHIMS: The
head clearance of your engine has been checked and set as
close as possible to 18 thousandths of an inch. A shim may
have been installed under the head to achieve this. Please
replace them should you need to disassemble the engine for
any reason.
REMEMBER:
Check all bolts on engine for tightness after each run.
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©2008-1998
Model Engine Corporation of America, All rights reserved.
K&B and the oval logo are Registered Trademarks of Model Engine
Corp. of America
Registered U.S. Patent Office
No
part may be reproduced without written permission from
MECOA/K&B -- P.O. Box 98 -- Sierra Madre, CA 91025 U.S.A.
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