Wiseco Pistons Part Two

Here is with the pin in both bores at the same time, a little shake and it falls through both bores with ease, the pin bore is correct on this piston.

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[PilotOdyssey]

A tight pin may also change the expansion characteristics of the piston and cause scuffing or seizure on the piston thrust faces. When the piston is unable to expand correctly along the pin axis it will expand at 90° to the pin and force the thrust faces of the piston hard against the cylinder wall.

[PilotOdyssey]

Before the piston is fitted, there are several clearance checks to be made. The first of these is the fit of the piston pin. It should be an easy slide fit, slipping through the piston under its own weight. A tight pin is to be avoided as this will overload the sides of the piston when the engine is running. At high engine speeds the crankshaft tends to whip and, if the pin is tight, this load will be transferred to the side of the piston, possibly distorting it and causing seizure.

[posiden125]

pins are precision ground to tolorence

slip fit is ok if its to tight like you have to press it in thats not good.

[madbiker53]

i dont think its anythin to worry about ive seen em tight to go in and a bit loose like that local dealer told me its nothin to worry about