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B
Mating face
Ed. 05-2011
ENGINE OVERHAUL
Carburettor overhaul
Clean all carburettor components thoroughly with gasoline and dry them with
compressed air. Clean all jets and holes thoroughly blowing them with com-
pressed air. Never use tool bits or metal wire. Check that the slide valve is
in good condition. It should slide freely in its housing, without too much play.
Check that taper needle and main nozzle are in good condition. Check the
needle valve for proper sealing.
H06593
Adjustment
a) - Idle
Idle adjustment shall be always carried out with engine warmed up.
Loosen the air adjuster screw (b) of 1 1/2 turns from the fully closed position ,
then gradually act on the idle speed adjuster screw (a) until reaching the idle
speed of 1,500 -1,700 rpm.
b) - Throttle intermediate position
A
Should it be necessary to modify mixture ratio, from the idle position at about
1/5 of throttle valve opening, fit a valve with a smaller front drain side to enrich
it, and with a bigger one to lean it.
From approx. 1/5 to 4/5 of throttle valve opening, mixture is mainly adjusted by
the taper needle fitted on the valve itself and anchored by a retainer inside an
intermediate groove. Should it be necessary to modify mixture ratio, lower the
H06595
taper needle to make lean it and raise it to enrich it, by adjusting the groove.
G.21
3
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