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cartmel808
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- Main scooter: 1975 Vespa Rally 200 Femsa
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Stripping an old Rally 200 engine down tonight & the old piston has scribed cross hatch markings scribed with a large dot punch to the centre of each - and these are all around the piston (see below pics)... never seen this before & just curious as to what purpose they serve?
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drunkmunkey6969
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Old school idea for increasing lubrication. Not often seen anymore.
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cartmel808
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Cheers for enlightening me Dan.
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dirtyhandslopez
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Probably not a dot punch, might distort the piston. More like a drill bit. Nice little oil collector spot. Most just have the cross hatch in a smaller pattern.
That's not going anywhere...