YS 140 FZ Question

[Bob Kane]

The power difference between the FZ and L is due to
the increased crankcase pressure because of the
different crankshaft design. The ported piston will
improve piston life and reduce the chance of piston
rock, but does not increase the power over a "stock"
FZ.

--- Lem Stevens <stevenslem at comcast.net> wrote:
> I have a 140 FZ that I bought at a swap meet, so I
> do not know its vintage.  The top of the piston is
> the expected flat disk.
> 
> I had a 140L, before this, that had ports through
> the top of the piston to the inside of the ring. 
> Apparently, as pressure in the cylinder builds, the
> ports press the ring out against the sleeve.
> 
> Do the new 140 FZs have this ported piston?  Can
> anyone say what kind of power boost can be expected
> with a ported piston?  Just curious.
> 
> Lem 

Bob Kane
getterflash at yahoo.com


	
		
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