If yer want to smell like a speedway bike...
put a bit of caster oil in yer fuel tank...

we use to use a caster in the jawa 2 valve & westlake speedway motors
the motors had a total loss lube system... oil from tank/though motor then
spat out the bottom onto the track..
The motor lasted longer on a good synthetic oil "Agip Synt 2000"

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...