Maintenance Manual and Instruction Book, 16H, Big 4, 18 and ES2

LOCATING AND RECTIFYING POSSIBLE TROUBLES.

TROUBLE.

POSSIBLE CAUSES. Faulty plug. Faulty H.T. lead. Contact breaker points dirty or out . of adjustment.

REMEDY. Remove plug, place plug body in contact with cylinder, revolve engine. If blue spark of fair intensity occurs, plug and ignition O.K. If no spark, change plug, and if still no spark, remove plug from H.T. lead, hold end of lead 1/8' from cylinder and revolve engine. In the event of there being still no spark, examine contact breaker points and check their gap. Examine pick-up brush and clean slip ring. Ensure that throttle slide rises as twist grip is revolved. With throttle about 1/-8' open and air closed, adjust pilot screw until good idling is obtained. Remove valve spring and test valve for side play in guide. Examine and re-grind as necessary. Check and re-set as required. Ensure that there is some movement in cable before lever begins to lift valve. Adjust. Can usually be removed by kicking engine over a few times. Examine and replace as required. Examine and make necessary replace­ ments. With engine running an intermittent stream of oil should be seen upon opening oil tank filler cap. Ensure that the necessary pressure is generated between timing cover and oil pnmp nipple fibre washers as instructed in para. 26. Adjust as in para. 32. Clean Mid re adjust. Ensure that ‘ petrol is flowing down feed pipes. Clean carburetter.

Failure to Start.

Pick-up brush worn or broken. Slip ring oily.

Failure of petrol to reach mix tug chamber.

Broken throttle wire.

Erratic Slow Running.

Pilot adjustment requires re-setting.

Worn inlet valve guide. Faulty valve seats.

No tappet clearance. Exhaust valve lifter holding valve off Mat.

"Loss of Power.

Front chain too tight. Loose carbon wedged on valve seat.

Broken piston rings. If accompanied by black smoke from exhaust, broken piston rings, worn rings or barrel. Oil pump not returning.

Excessive Oil

Consumption.

If unaccompanied by exhaust smoke, faulty oil pump timing cover connection.

Mag. chain too tight. Dirt in carburetter.

Engine Runs Harshly. Engine Cuts -Out at Large Throttle Openings.