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cartmel808
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Main scooter: 1975 Vespa Rally 200 Femsa
Location: Durham, England
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Tue Oct 03, 2017 10:44 pm

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?
ImageImage


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drunkmunkey6969
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Tue Oct 03, 2017 11:25 pm

Old school idea for increasing lubrication. Not often seen anymore.


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cartmel808
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Posts: 490
Joined: Tue Feb 04, 2014 10:35 am
Main scooter: 1975 Vespa Rally 200 Femsa
Location: Durham, England
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Wed Oct 04, 2017 9:56 am

Cheers for enlightening me Dan.


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dirtyhandslopez
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Thu Dec 21, 2017 4:30 am

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...

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