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General & Tune

Valve timing — '78+ cam

Value
In 16°BTDC–44°ABDC
Alt
Ex 56°BBDC–4°ATDC
Applies · incl. 1981
Datum: 2.0 mm clearance, ±2.5°. Exhaust closes 4° ATDC — after top dead centre, giving the normal overlap with the intake that has already opened at 16° BTDC. (An earlier revision of this table printed the same event as 4° BTDC in the note; ATDC is correct, and a 4° BTDC exhaust close would leave no overlap at all.) This is the 1978 column (R80/7, R100/7, R100S, R100RS). The 1977 cam is In 10°BTDC–50°ABDC, Ex 50°BBDC–10°BTDC.

This is the book's general row. In the book, pick your model and year and this figure resolves to your machine, with the one-page torque sheet, the job pages and the printable booklet.

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