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INSTALLING AND ADJUSTING THE TIMING PULLEY
Pulleys have been unavailable for some time. We find them sporadically but not always do we have both versions available at the same time. For that reason, we may have supplied you with the wrong one for your bike. The following information will allow you to properly mark the available pulley for your engine.
Crankshaft pulley selection
All but the earliest pulleys have four marks on the outside edge of the rear half. Facing the forward-facing side of the pulley the marks are, from left to right, top dead center for the left-hand cylinder (as viewed sitting normally on the bike), static ignition advance, 2200 rpm ignition advance, and full ignition advance. The V7 and Ambassador have 10º of static timing (the ignition is triggered at 10º before top dead center on a static engine) while the Eldorado uses 5º.
In case you need to adapt this pulley to the Eldorado, here are the distances between marks, measured around the circumference. The existing three marks to the right of top dead center can be filed smooth and new marks made with a shape edged file. In case you’re wondering: yes, it would seem that the distance between the 2200 and full advance marks should be the same for each pulley. They weren’t, though, on all the pulleys we checked.
PART # / APPLICATIONS / INITIAL ADVANCE / LEFT TDC TO STATIC TIMING MARK / STATIC TIMING TO 2200 RPM MARK / 2200 RPM TO FULL ADVANCE MARK12074000 / V700, Ambo / 10º / 10 mm / 19 mm / 9 mm
13074060 / Eldorado / 5º / 5 mm / 19 mm / 7 mm
Timing your crankshaft pulley
Since the pulley has three evenly spaced mounting bolts, there are three ways to install it and of course only one is correct. To get it right, start by positioning the left-hand piston at top dead center (precision not necessary) on either engine stroke. Position the pulley so that the top dead center mark aligns with the arrow on the engine’s front cover. Installing the front half of the pulley is dependent on tensioning the generator belt as described in the next section
Adjusting generator belt tension
Your Guzzi generator needs far less belt tension than the average car. That’s because the distance between pulleys is shorter and each point is (or should be) firmly positioned.
The tension is adjusted by varying the number of shims located between the pulley halves - the more used, the looser the belt tension. Extra shims must be stored forward of the pulley on the same three mounting screws. Otherwise, if few shims are positioned between the halves and none in front of the pulley, the three mounting screws can jam into the engine front cover.
When tightening down the pulleys halves to the crankshaft-mounted carrier, it’s important to tightened evenly in small increments and to turn the pulley often while tightening. This is to prevent possible cracking of the pulley. It’s very easy to cause the three mounting screws to stretch and break during this procedure. A better option to the original screws is to replace them with 6 x 16 mm stainless steel hex-head bolts which give a much firmer feel when tightened.
CHS PULL