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guys,
is this a suggestion to regrind the clearance to .03mm on the GTS?
The FJ is manufactured with pretty loose tolerances, compared to a water
cooled engine, to avoid metal to metal between the aluminum piston and steel
cylinders sleeves, which have different coefficients of expansion, to help
avoid to tight a fit when engine gets hot.
What tolerances are you referring to? Piston to wall clearance? There are
many variables to consider, from an engineering stand point, on correct
piston to wall clearance, piston diameter being one of the more important.
Silicone content in a piston, and whether it is forged or cast, also must be
considered, because they expand to different degrees. Check the clearance
recommendations for Wiseco pistons compared to stock, much greater
clearance,
for the same engine and cooling system.
Facts from the 1993 Yamaha Technical Service Data microfiche:
GTS Piston to wall clearance is 0.06 ~ 0.08 mm (0.0024~0.0031") Bore Size
75.5
1993 FJ1200AE Piston to wall clearance is 0.03 ~ 0.05 mm
(0.0012~0.002") Bore size 77 mm
Mike Coan
www.warmnsafe.com Home of the Heat-troller
www.ttg-global.com Motorcycle & Travel Site
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