NB: These instructions are given for guidance only and cannot engage the author's liability in the event of misinterpretation, failure to assess the vehicle's actual condition and/or non-conformity, unsuitable mechanical practice or the use of inappropriate tools.
All the values and specifications of Laverda camshafts are in the technical section of the Laverdamania site and available to download from the JLO-Tech site.
Camshafts are fragile parts, to be protected from impact and stress. They are supplied checked and greased (corrosion protection).
Fitments
- A11 replacing A12: very simple — fit the A12 gears onto the A11, then time the valve gear conventionally as for the A12. M6 gear screws with medium threadlock + lock washer. However, the valve clearances differ: 0.20 mm inlet, 0.25 mm exhaust.
- Special Axtell cams in place of A12 or A11: same operation as above.
- 4C or 7C cams in place of A11/A12: the gears are different — fit specific gears or re-drill the A11/A12 gears to convert them to 4C/7C gears (contact JLO-Tech for the drilling jigs). Valve clearances the same as A11.
NB 1: fitting 4C or 7C racing cams is only worthwhile if the engine is prepared accordingly (high-compression pistons, big valves).
NB 2: it is always wise to check the valve-timing diagram (method in the Laverdamania technical section), especially after the engine has been dismantled/restored.