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12
Cooling Problems
Engine overheating is most often caused by running the engine too lean
or because the cooling air for the cylinder head is blocked. If the mixture is
too lean, simply allow the engine to cool, richen the mixture and try it again.
Bodies must have holes cut in them to allow for cooling air to circulate over
the surface of the cylinder head. On most bodies, it is a good idea to cut
part of the wind-shield out and part of the back window to allow for
additional cooling.
Factory Settings for GO.18
All new engines are assembled with what we will term ‘factory
settings’. These settings should allow almost all engines to be started up
and allow for minimal adjustment for running in purposes.
Bearing this in mind, we are offering you the opportunity of re-adjusting
to the ‘factory settings’ based on engines currently held in stock.
Main Needle Valve – High Speed Adjustment (HSA)
Screw down until resistance is met, and no further movement is apparent.
RE-OPEN 3 1/4 TURNS.
Throttle Adjustment Screw – Idle Adjustment (IA)
Gently shut off carburettor sliding body and slowly re-open by means of
adjusting screw.
ADJUST SCREW UNTIL APPROX 1 or 1 1/4mm OF APERTURE APPEARS
BETWEEN THE END OF THE THROTTLE BODY AND AIR INTAKE APERTURE.
Sub Throttle Needle Valve –
Low Speed Adjustment (LSA)
With adjustment screw setting in place, close off the throttle body against
the screw. Very gently screw in the needle valve until it closes off the supply
fuel nozzle and is prevented from re-opening by the entry of the needle
valve into the centre hole of the fuel nozzle (work with great care with this
one - we are only looking for minimal frictional contact between both parts).
RE-OPEN VALVE 2 1/2 TURNS.
Glossary of Carburettor Functions
Main Needle Valve (High Speed)
The main needle mixture screw controls how much fuel enters the engine
during mid- to high-speed operation. The screw is turned clockwise to lean
(less fuel) and anti-clockwise to richen (more fuel)
Sub Throttle Valve (Low Speed)
This screw meters the fuel at low speeds. The low-speed mixture screw is
located in the end of the carburetor, inside the throttle arm.
This screw controls how much fuel enters the engine at idle and low
throttle. This adjustment will smooth the idle and improve the acceleration
to mid speed. Make this adjustment with the throttle closed, after setting
the idle. The screw is turned clockwise to lean (less fuel) and anti-clockwise
to richen (more fuel)
Throttle Adjustment Screw
The throttle adjustment screw regulates the throttle opening to control the
idle speed. The screw is turned clockwise for a higher idle speed and anti-
clockwise for a lower idle speed.
LSA
HSA
IA
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