which is sealed with a screw in cap, very small
“C” circlips that require very fine circlip pliers
for removal.
• The connecting rod is machined from
high tensile bar stock aluminium, offset big
end, needle roller bearing on big end, bronze
bush in little end, connecting rod and needle
roller bearing retained by a special left hand
thread screw.
• Liner is heat treated carbon steel-very
hard-deep multi hone scoring for oil retention
, extremely large transfer and exhaust porting
(high performance design), liner located by pin
in cylinder fitting into slot on rim of the liner.
• Crankshaft is almost standard design
from OS-high tensile alloy steel, heat treatedexcellent finish on all surfaces.
• The heat sink style finned head is
sealed onto the liner rim with a brass shim
and is retained to the cylinder with 6 screws.
The head is threaded for CM10 spark plug
which is supplied.
• CDI module is manufactured to high
standard required by OS, delivering very high
voltage to the plug and is capable of extreme
high speed operation and has proven reliability.
An important note here; ensure the plug cap is
pushed down onto the plug as far as it will go.
A piece of wood or a plastic handled screwdriver helps get it down and tight. Best per-
formance will come from using the maximum
voltage advised and a high capacity battery.
• Read and understand the instructions
that come with the engine-particularly the section of the setting of the carburettor.
WARNING
Do NOT use motorcycle or lawn mower
oil in the fuel as the flash point is too low
for model engine operation. Suggest
PETROMAX from Model Engines, Morgans
Blue CoolPower, Klotz Original Techniplate
(KL2000) or Klotz R50.
Also do NOT use Ultra petrol as unleaded (95RON) is all that is required.
What Brian has said just confirms how
good this engine is. The version of the
GT15HZ engine I ordered came with a specially designed Power Boost pipe. It is the perfect pipe for the engine and is suited to be
mounted in a model helicopter.
I really can’t wait to get this into a suitable
90 sized model helicopter. But so far the
weather gods have been extremely unco-operative, so I won’t get any of the flying stuff
done until the next edition.
Until next time HAPPY DRY HOVERING.
Peter R
Airborne
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