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7.4 Gaskets
We advise to replace all the gaskets of tight after 100 hours of use of the motor: gasket
cylinder, carburetor, reed valve and silencer. Equally the o-ring: exhaust, cylinder head.
In the case the motor is not used for long period, we suggest to verify the situation of
the gaskets in contact with the gasoline and if necessary to replace them.
7.5 Silencer
The substitution of the soundproofing material of the silencer is recommended every 25
hours of operation. Once replaced the soundproofing material you will find again the
same noise that the engine had when the motor was new. Separate the silencer from the
exhaust pipe, proceed getting off first the band of support in steel, then the 2 nuts that
unite the silencer to the muffler. Now remove the two rivets that fix the silencer.
Change now the soundproofing material worn out, cleaning the covers that seal the
silencer and continue to the assemblage of the new soundproofing material. Add as
denoted in the figure 7.5.1 and 7.5.2 a sealing paste, resistant to high temperatures on
the points of junction, fix two new rivets in the original position, change the gasket
silencer-muffler.
You now proceed bashful for the assemblage of the silencer. It will be possible to
purchase soundproofing material from the Vittorazi / dealer Vittorazi. If the
soundproofing material is purchased in a spare parts shop for car/motorbikes, you don't
exceed with the quantity of soundproofing material, the effect after few hours will be
contrary to the desired one. We recommend to cut out a square of the same dimensions
of the material just replaced.
7.5 / silencer
7.6 Rubber mountings
We advise to inspect at the end of every use of the motor the conditions of the rubber
mountings. In the case which one of these presents a crack or a detachment of the
rubber, immediately replace it. Reached the 100 hours, replaces the rubber mountings of
the motor (4pc) and the exhaust system (2pz). For a correct installation of the new
rubber mountings, you compare the paragraph 3.2.
