IAME GR-3 040/EM/12 Manuale utente

GR-3 -

040/EM/12 - 60cc

USER MANUAL

MAN

–

095-20 - EN

FEEDING

Fuel mixture 98 RON and 4% motor oil (CIK homologated).

We recommend:

- WLADOIL K 2T ;

- ELF HTX 909 ;

- ELF HTX 976 ;

- EXCED RSK M.

PREPARING THE MOTOR MOUNT

To fix the engine onto the chassis it is necessary to make holes on the motor

mount with the following dimensions:

ELECTRIC SYSTEM

The engine is provided with homologated digital ignition. The advance has to be

set to 2.60mm before TDC, corresponding to 26°~.

The spark point is where the markings on both rotor and stator match.

Please take particular care to the ground connection between the coil’s

steel body and the appropriate screw on the clutch cover.

MAIN ENGINE COMPONENTS’ MAINTENANCE INTERVALS

The components’ lifetime can change according to the engine use.

PISTON / CYLINDER MATCHING

The piston has to be replaced when the measured clearance exceed 0.11mm.

As a general prescription, we recommend to replace it after an approximate

consumption of 60 litres.

The size marked on the top of the piston is the diameter of the cylinder bore

where the piston has to be installed.

The prescribed clearance, provided within the piston when brand new, is

0.07÷0.08mm.

This is reached by honing the cylinder at the same diameter marked on the piston

top, for the green selection, or adding 0.01mm to the diameter marked on the

piston top, for the red selection.

The effective piston diameter can be verified measuring perpendicularly to the

piston pin at 15mm from piston base.

The gap between the piston ring tips (installed into the cylinder) must be between

0.05÷0.15 mm.

The gap can be checked with a feeler gauge, by inserting the ring into the cylinder.

MAIN BEARINGS

With the roller bearings, the lifetime is a full sporting season.

CONROD BIG END CAGE, CRANKPIN and WASHERS

The replacement must be performed after an approximate consumption of 120lt

of fuel.

CONROD SMALL END CAGE

The replacement must be performed after an approximate consumption of 120lt

of fuel.

CONROD

We recommend to replace the conrod when the ovalization of big end bore

exceeds 0.01mm. This value is the difference between the diameter measured in

"A" and "B" as below indicated.

As a general prescription, we recommend to replace it after an approximate

consumption of 240 litres.

IDLE RPM

SCREW

“M”

IDLE

MIXTURE

SCREW

CARBURETTOR SETTING

The carburettor is supplied with a standard setup. Please find the standard setup

reported below.

The carburettor setup has to be adjusted in function of track and weather

conditions, acting on the setup parts available.

DELLORTO PHBG 18 BASIC SETUP

To set the engine idle RPM, act on screw “M”.

Turn counter clockwise to decrease RPM and clockwise

to increase.

EXAMPLE OF RACING SETUP

FUEL PUMP CONNECTIONS

CONICAL NEEDLE

W23 - 2ª NOTCH FROM TOP

GAS THROTTLE

ATOMIZER

AU 262

MAXIMUM JET

IDLE JET

STARTER JET

IDLE MIXTURE SCREW

1 TURN

CONICAL NEEDLE

W1 - 2ª NOTCH FROM TOP

GAS THROTTLE

ATOMIZER

AU 262

MAXIMUM JET

MINIMUM JET

STARTER JET

IDLE MIXTURE SCREW

2 TURNS

Delivery to carburettor

without fuel return to

the tank

Breather

(from crankcase)

Inlet

(from tank)

TECHNICAL DATA SUMMARY TABLE

DESCRIPTION

DATA

FUEL MIXTURE / FUEL

4% OF OIL

FUEL 98 RON

Oil CIK homologated

LIMIT PORT TIMING

Exhaust 156° (0°/-2°)

Transfers 114° (0°/-2)

Inlet 144° (0°/-2)

Feeler gauge 0.2x5mm

TIMING ADVANCE 2.60 mm

Before TDC

COMBUSTION CHAMBER VOLUME 7 cm³

(min. 6.80cm³)

SQUISH 0.52÷0.55mm

measured with single wire d.1.5mm

PISTON RING GAP 0.05 ÷ 0.15 mm

Installed into the cylinder

AXIAL SHAFT CLEARANCE (END FLOAT) 0.40 ÷ 0.50 mm

SPARK PLUG FOR STANDARD WEATHER

CONDITIONS NGK BR 10 EG

SPARK PLUG FOR RAIN CONDITIONS NGK BR 9 EG

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