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New Pistons
#808682 05/12/20 6:56 pm
Joined: Mar 2020
Posts: 17
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Does anyone have recommendations for replacing the pistons on my 71 Thunderbolt. MAP has some that are made in Taiwan for about $55.00. CBS list some from JCC also from Taiwan for $80.00. Both list Hastings rings. Thanks for any suggestions. Russ

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Re: New Pistons
RUSS TILLEY #808683 05/12/20 7:09 pm
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The best you’ll get are JE pistons from Ed V, not as cheap as the others but the best you’ll find.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: New Pistons
RUSS TILLEY #808716 05/12/20 11:04 pm
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Thought you might be interested in this thread. If you search, there are a number of these threads, in which John Healy expresses the thought that the JCC pistons are quite good quality, and are at least the equal of the Hepolites.

http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=553271

In this thread, John said this:

"There have not been any "new" Hepolites in the market place for nearly 10 years. The current pistons sold under the Hepolite brand name are JCC.

Snakeoil - the computer you wrote those words on, and nearly everything else you have come to rely on, is made somewhere in Asia. Most of the rest of the stuff was made in Asia and assembled in Canada or Mexico. The JCC piston manufacturing tolerances are far superior to anything Hepolite ever sold!!!!!!

We find a few tenths variation between runs of JCC pistons where it was often thousandths with Hepolite. The pistons varied so much that Triumph had to grade their cylinders to match the pistons."

Most JCC piston dealers also offer other brands of rings as part of a set.

I have also recently installed a set of MAP 9-1/2:1 CNC machined billet pistons with a modern ring set, bored with my torque plate, in a T140. They take a bit of care to install, because they are quite close fitting to the head. I don't have many miles on these yet, but they seem to work quite well so far. However, I don't think Marino is making those pistons for BSAs yet.

Last edited by linker48x; 05/12/20 11:10 pm.
Re: New Pistons
RUSS TILLEY #808725 05/12/20 11:40 pm
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Hi Russ,

The JE pistons from Ed V are things of beauty.

[Linked Image from i.postimg.cc]


73' Trackmaster T140
69' Lightning
69' Victor
66' Royal Star - Watsonian
58' GS Scrambler
58' Super Rocket
54' Golden Flash
Rickman Zundapp
Re: New Pistons
bsahatch #808729 05/13/20 12:12 am
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Where do you get them? Is there a website/

Re: New Pistons
RUSS TILLEY #808746 05/13/20 1:59 am
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73' Trackmaster T140
69' Lightning
69' Victor
66' Royal Star - Watsonian
58' GS Scrambler
58' Super Rocket
54' Golden Flash
Rickman Zundapp

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