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The ATHENA S410485006036 cylinder base gasket is designed for YAMAHA TT 350 from 1985 to 1995. The base gasket seals between the cylinder and the crankcase. Its thickness matters: it sets the height of the cylinder, and therefore the squish, the compression and, on a two-stroke, the port timing.
Every time the cylinder is removed: a crushed base gasket can't be reused.
Athena, an Italian company founded in 1973 near Vicenza, designs gaskets, pistons and cylinder kits for motorcycles. An OEM supplier to KTM, Ducati, Fantic, Piaggio and Triumph and a partner of the MXGP world championship, it develops its parts on the test bench and on the track with racing teams.
Which thickness should I choose?
The same as your original gasket, unless you are deliberately adjusting the squish.
Should the other gaskets be replaced?
Yes, as soon as the cylinder is removed: a top end gasket kit includes all the gaskets that need replacing.
Check the exact model and year of your bike in the list below before ordering.
Fits:
YAMAHA TT 350 1995
YAMAHA TT 350 1994
YAMAHA TT 350 1993
YAMAHA TT 350 1992
YAMAHA TT 350 1991
YAMAHA TT 350 1990
YAMAHA TT 350 1989
YAMAHA TT 350 1988
YAMAHA TT 350 1987
YAMAHA TT 350 1986
YAMAHA TT 350 1985
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