Top Flite TOPA0951 User Manual
Page 19
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3. Drill 3/32" [2.4mm] holes through the cover
precisely 1/4" [6.4mm] up from the edge of the cover
at the
front
marks and precisely 1/8" [3.2mm] up from
the edge at the rest of the marks. The best way is fi rst
to
dimple
the surface with a sharp 1/16" [1.6mm] drill,
and
then drill
the 3/32" holes while holding a wood
block to the back of the cover.
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4. Holding the cover in position, use the middle
hole in one side of the cover to drill a 1/16" [1.6mm]
hole through the rail. Mount the cover with a #2 × 3/8"
[9.5mm] Phillips screw. Perform the same procedure
for the same hole on the other side. Then, alternating
sides, continue to drill the rest of the holes and install
the screws one at a time.
Hint:
Run the drill in and
out of the holes in the front blocks several times to
slightly enlarge the holes, or use a 5/64" [2.0mm]
drill for those holes. This is because the hardwood
that the blocks are made from grabs the screws
much harder than the rail for the rest of the screws.
Optional:
Instead of using Phillips screws, use #2 ×
3/8" [9.5mm] button-head Allen screws (GPMQ3120,
not included). These Allen screws have a smaller
head for a better, more-fi nished appearance, but
require a high-quality .050" Allen wrench so the
heads do not strip out. A suitable wrench is the MIP
Thorp hex driver wrench (MIPR9000).
MOUNT THE ENGINE
Although the O.S. .91 4-stroke engine is illustrated
in most of the photos, unless noted otherwise, the
mounting instructions apply to all engines.
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1. Temporarily fi t together the two halves of the
included motor mount with four 8-32 × 1" [25mm] SHCS,
#8 lock washers, #8 fl at washers and 8-32 blind nuts
placed backwards on the screws, but leave the screws
loose enough so you can slide the halves in and out.
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2. Adjust the mount to fi t your engine and tighten
the screws so the halves will not slip. Use small clamps
to hold the engine to the mount with the drive washer
as close to 5-1/2" [140mm] as you can get, from the
base of the mount.