2. Rotate flywheels in opposite direction until
checking pin contacts cylinder gasket surface again.
Repeat procedure to rod again. If drag on papers is
equal no bending is required. If one paper is loose,
use rod bending tool to tweak rod in direction of
loose paper and recheck.
3. Repeat checking and bending procedure for the
other rod.
C. Visual Procedure
1. Install pistons on rods without rings or wristpin
clips. Bolt cylinders with gaskets in place.
2. Move piston tight towards camside of engine.
3. Turn engine over in normal direction of travel 2 or
3 revolutions and observe piston during process.
4. Move piston towards driveside of engine and
repeat Step C. If inaccuracies are present due to
machining variations in cases, cylinders or pistons,
top land of piston deck will appear closer to
cylinder wall at one point around circumference.
This means that piston is cocked in cylinder bore
and can be corrected by bending rod in opposite
direction.
Figure 4 shows an exaggerated side view
of this condition.
5.
Repeat Steps B to D for other cylinder.
11. Cylinder Head Preparation
A. Head Gasket Surface Flatness Check - Before top end is
assembled, head gasket to cylinder mating surfaces
should be checked as follows
1. Thoroughly clean cylinder head gasket surfaces.
2. Place straight edge ruler across head gasket
surface at different places around diameter to
determine flatness.
3. If unevenness is revealed, machine head gasket
surface just enough to make complete contact.
Incomplete contact between gasket surfaces of cylinders and
cylinder heads may cause combustion leakage possibly
resulting in damage to cylinders and/or other engine
components.
B. Modify 883 Cylinder Head Combustion Chamber - If
883cc cylinder heads are to be used, the combustion
chambers must be modified to improve air flow and
r
educe the compr
ession ratio. Follow enclosed
Instruction Sheet #3883 or #3884 depending on style of
combustion chambers in heads to be used. 1200cc
heads do not require this modification.
NOTE: Stock 1200cc heads or modified 883 heads will provide a
usable compression ratio but the small valves and ports in stock
heads will be a limiting factor for a large displacement
per
for
mance motor. T
o achieve the full potential of the engine
it is recommended that the size of the valves be increased and
the por
ts modified to fur
ther improve flow
. In weighing the
expense and difficulty of these modifications, it may be more cost
effective and results intensive to use S&S
®
or other aftermarket
per
formance heads.
10
Picture 15 Figure 4
CAUTION
Figure 3
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