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Author Topic: longstroke A7 pistons  (Read 1425 times)

Offline terryk

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longstroke A7 pistons
« on: 01.06. 2011 13:18 »
Has anyone used these L.F.Harris pistons in a longstroke A7? They are listed as A7 but make as Triumph and 9.1 comp. I am looking at 7.25 comp but could machine off the top of these to match. Any thoughts.

http://www.vintage-motorcycle.com/index.php?language=en&site=4&pid=160&id=13711&suchtext=bsa%20a7%20pistons&limit=0
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1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm

Offline muskrat

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Re: longstroke A7 pistons
« Reply #1 on: 01.06. 2011 21:07 »
G'day Terry,
                don't have a LS A7 but used harris pistons in the A7SS racer, they were T150/160 9:1's and performed quite well.
Be careful lopping off the top, don't make them too thin.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Muskys Plunger A7

Offline fido

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Re: longstroke A7 pistons
« Reply #2 on: 01.06. 2011 21:14 »
Yes, it would be safer to make a compression plate although you then find the pushrods are too short  *doh*
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