CLEANING AND LUBRICATING FEATURES: A cleaning hole has
been added to the front plate to aid in cleaning the front
or top bearing. Simply place an aerosol can of Liquid Wrench
(or similar product) up to the hole and back flush
the bearing. Continue to flush the bearing until you see fresh
cleaner come out under the flywheel. The bearing may also
be oiled in the same manner.
hole for the flex shaft has been added to the lower unit.
It is recommend that each time, before you run the unit, you
lubricate the cable with a mixture of 50% STP and 50% 20-50
weight oil. K&B still recommends that you continue to
remove, inspect and re-lube the flex cable (using Lube P/N
8449) on a continued basis.
COOLED HEAD: A feature of this engine is the air cooled
head. This feature does not mean that the engine is to be
run outside of water for prolonged periods of time as the
lower unit does require water for cooling. CAUTION:
Air cooled head becomes hot after usage.
CLEARANCE: Your engine has been factory set with a head
clearance of approximately .010 to .015.
INSTALLATION: Two 4-40 x 3/8 screws are included
within your accessory package for muffler installation. Simply
slide the muffler through the cutout in the lower unit and
install the screws and gasket through the muffler adaptor
in the matching holes on the muffler. Tighten screws.
We recommend after each days running, that you check
each bolt and screw for tightness.
For maximum life of propeller shaft bushing do not operate
engine out of the water for a period of longer than thirty
(30) to forty-five (45) seconds.
LOWER END: Tests have proven that the cable drive is far
superior to the gear drive. Maintenance is cut down to a minimum.
However, we ask that you occasionally check and lubricate
the flex cable. Check for excess wear and fraying. Do not
rotate the engine by flipping the propeller in a counter-clockwise
direction. Fraying and unwinding may occur. We recommend a
good silicone base lubricant such as K&B marine grease
(P/N 8449) for your outboard as well as other drive units.
PLUG: This Engine is designed to use the long reach glow
plug (K&B P/N 7311). For high nitro fuels use K&B
7300 Glow Plug.
We recommend using K&B 525 (25% nitro) or K&B
Speed Fuel 550 (50% nitro).
An ABC type engine, (Aluminum, Brass, Chrome)
does not require prolonged break-in periods. However, we recommend
that you run the engine at a slightly rich needle valve setting
for the first two runs. These runs should be made with the
engine installed on the boat and running in the water for
periods of not less than five (5) minutes each. Typically,
an engine will be ready for continuous full throttle and a
leaner needle valve setting after ten (10) to fifteen (15)
minutes of running.
If the engine is run at a lean needle valve setting during
the break-in period, the following may result.
and sleeve will overheat and score.
connecting rod, crankshaft and wrist pin will overheat from
lack of lubricant and seize, causing the lower con-rod bushing
to spin in the con-rod, or in extreme cases, the bottom of
the con-rod will break, causing damage to the crankcase, piston
crankshaft may seize inside the front plate and fracture.