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The BSA A7-A10 Forum
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Hepolite pistons
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Topic: Hepolite pistons (Read 761 times)
mugwump
A's Good Friend
Join Date: Jan 2016
Posts: 129
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Hepolite pistons
«
on:
23.02. 2016 17:49 »
Has anyone used the new Hepolite ( Taiwanese ) made pistons in their bike, and can anyone tell me which way up the rings go. The instructions in the box are a little confusing ( not difficult I know). the two top rings have a chamfer on the inside of the rings.Which way up are the chamfers.
Thanks
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60'Matchy G12
58 AJS 18s
58 Ariel Huntmaster]
muskrat
Global Moderator
Wise & Enlightened
Join Date: Jul 2009
Posts: 10760
Karma: 130
Lithgow NSW Oz
Re: Hepolite pistons
«
Reply #1 on:
23.02. 2016 18:34 »
G'day mugwump.
I haven't tried the pistons but to answer the ring question the chamfer goes up.
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 .
Australia
Muskys Plunger A7
mugwump
A's Good Friend
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Re: Hepolite pistons
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Reply #2 on:
23.02. 2016 20:53 »
Thanks Muskrat.
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60'Matchy G12
58 AJS 18s
58 Ariel Huntmaster]
Rocket Racer
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Join Date: Jun 2009
Posts: 1670
Karma: 17
A kiwi with a racing A10 rig and too many projects
Re: Hepolite pistons
«
Reply #3 on:
01.03. 2016 03:10 »
A number of owners over here have fitted the new (not nos) hepolite flat tops and I have yet to hear any problems regarding
For a road engine I'd say they are a good option
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A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand
Brian
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Join Date: May 2007
Posts: 1806
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Mt Gambier, South Australia.
Re: Hepolite pistons
«
Reply #4 on:
01.03. 2016 03:19 »
I think I was one of the first people to use these pistons, before they were sold as "Hepolite".
This is a link to my original post.
http://www.a7a10.net/forum/index.php?topic=2642.msg17245#msg17245
At the time I found the pistons very good but the rings were scrap. I believe the pistons currently being sold as "Hepolite" are the same pistons but now supplied with "Hastings" rings which should be good. Maybe someone can confirm this.
I no longer own the two bikes I fitted them to, both plunger A10's but both bikes were still running strong the last time I heard of them.
I will definitely use these new "Hepolite" pistons the next time I need a set.
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mugwump
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Re: Hepolite pistons
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Reply #5 on:
01.03. 2016 10:10 »
Thanks guys, thats very helpful. I have to say looking closely at the rings they do look a bit rough. I have also heard that Gandini and Hastings do rings which are a straight fit and far better. By the way, what ring gap should I be aiming for.
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60'Matchy G12
58 AJS 18s
58 Ariel Huntmaster]
Brian
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Join Date: May 2007
Posts: 1806
Karma: 43
Mt Gambier, South Australia.
Re: Hepolite pistons
«
Reply #6 on:
02.03. 2016 02:45 »
The BSA book says .011" for the oil ring and .013" for the plain rings but it may be a bit more if your bore has some wear.
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
»
Hepolite pistons