32744 sprintinst 7

Using Standard Distributor.

The yacuumline is not connected so that the distributor gives fixed ignition.

For all engine types, set to 30° BTDC.

The crankshaft pulley has t\vo marks on it corresponding to 7^aftd 10^~    '

BTDC. Measure round the rim of the pulley a further łtySUk* orjtmrnto V the right from the right hand mark and scratch a linę. This will be the 30 mark and the distributor must be set so that the points open as this linę passcs the crankcase joint.

Should any difficulty be experienced in starting from cold due to the engine 'kicking back', slightly retard the ignition¹ until this is overcome but do. not go be Iow 25° BTDC.

CARBURETTOR ADJUSTMENT (FINAŁ). (Photos 16 - See also pamphlet

G6604/SB211 supplied).

Finał adjustment of Idle .

Start engine and allow to warm up. Adjust each throttle-screw equally until an idle speed of about 800 RPM is obtained. Working on each carburettor in tum, move the jet-adjusting nut half a turn at a time until the idle is at its fastest and smoothest. Re-adjust the throttle-stop scrcws egually to return the idle speed to 800 RPM.

USEFUL CHECKS:-

On the side of each carburettor will be found a smali pin, which when pushed up, lifts the air-valve. When the mixture is correct, lifting the air-valve has hardly any effect. When the mixture is too rich, lifting the air-valve causes engine to speed up. When the mixture is too weak, lifting the air-valve causes the engine to falter and slow down or stop. Exact balance between the two carburettors can be judged by listening to the'hiss' of each in turn, or by moving each throttle-stop screw in and out k turn and listening to the effect on engine speed which should be the same for both.

Set FulI—throttle position.

Switch off engine . Get someone to hołd the accelerator pedał hard down. Lift each cross-shaft end-lever in turn to bring the carburettors to fulI — throttle and tighten the end-lever clamp nuts.

SYNCHRONISE THROTTLE.

Release accelerator so that carburettors return to idle position.

Now operate the rocking-lever gently and watch the action of the carburettor levers. One carburettor will probably be 'taking up' before the other. Lengthen the nylon link on this side by turning the centre nut with a spanner. (Photo 16.) When take-up appears even, start engine and operate rocking