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Piston marking #720797
01/01/18 9:22 pm
01/01/18 9:22 pm
Joined: Oct 2017
Posts: 125
MA
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Nick H Offline OP
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Nick H  Offline OP
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Joined: Oct 2017
Posts: 125
MA
This lovely '66 Lightning is new to me and missing a few pieces.
[Linked Image]
The pistons came in a box and are marked "1.50". Does that mean the pistons (assuming they are for this bike") are for a 1.5 mm bored over cylinder? Isn't that a lot? What's the most they can be bored to? I'll be on this forum a lot in Spring when I attempt to make this a runner.



1966 BSA Lightning
1967 Triumph "Choppa"
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Re: Piston marking [Re: Nick H] #720802
01/01/18 9:35 pm
01/01/18 9:35 pm
Joined: May 2013
Posts: 5,131
Rotherham - S. Yorkshire
Allan Gill Online happy

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Allan Gill  Online Happy

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Joined: May 2013
Posts: 5,131
Rotherham - S. Yorkshire
1.5mm is .060ā€ Iā€™m running this over size on my motor with no problems. I think map has .080ā€ pistons and maybe even .100ā€ but your getting a bit thin by then... however a lot of it is down to the barrel casting.


beerchug
Re: Piston marking [Re: Nick H] #720808
01/01/18 10:03 pm
01/01/18 10:03 pm
Joined: Oct 2017
Posts: 125
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Nick H Offline OP
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Nick H  Offline OP
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Great, thank you! Don' t know why they don't just mark in inches as that's how the rings seem to be sold.


1966 BSA Lightning
1967 Triumph "Choppa"
Re: Piston marking [Re: Nick H] #720831
01/02/18 3:33 am
01/02/18 3:33 am
Joined: Aug 2001
Posts: 137
Anchorage Alaska USA
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Mitch Offline
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Mitch  Offline
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Anchorage Alaska USA
then ya wouldn't have CCs

Re: Piston marking [Re: Nick H] #720884
01/02/18 6:14 pm
01/02/18 6:14 pm
Joined: Oct 2017
Posts: 125
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Nick H Offline OP
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Nick H  Offline OP
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who needs 'em when you have 40 inches?


1966 BSA Lightning
1967 Triumph "Choppa"
Re: Piston marking [Re: Nick H] #721138
01/05/18 10:09 am
01/05/18 10:09 am
Joined: May 2004
Posts: 3,893
Sydney Australia
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BSA_WM20 Offline
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Joined: May 2004
Posts: 3,893
Sydney Australia
Originally Posted by Nick H
Great, thank you! Don' t know why they don't just mark in inches as that's how the rings seem to be sold.


Generally rings are measured in mm for bore, 1/8" for width & 1/10" for radial depth.
Always amused me.


Bike Beesa
Trevor

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