BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JWood Auctions JRC Engineering dealers JWood Auctions
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
CaptainPugwash
CaptainPugwash
Conisbrough,Yorkshire, UK
Posts: 69
Joined: November 2008
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
17 registered members (6T), 146 guests, and 379 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Konaflyer, Begbie, Andrew Fallo, Zack Banks, 1966g10
10418 Registered Users
Top Posters(30 Days)
btour 89
Rohan 81
Triless 77
reverb 75
Popular Topics(Views)
710,199 mail-order LSR
Forum Statistics
Forums34
Topics68,305
Posts665,023
Members10,418
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
Piston marking #720797
01/01/18 9:22 pm
01/01/18 9:22 pm
Joined: Oct 2017
Posts: 106
MA
N
Nick H Offline OP
BritBike Forum member
Nick H  Offline OP
BritBike Forum member
N

Joined: Oct 2017
Posts: 106
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"
Support your #1 BSA Forum and our favorite sponsors

Check out BSA on e-bay: BSA Parts in UK, BSA Motorcycles in UK, BSA Parts in North America, BSA Motorcycles in North America

 
Re: Piston marking [Re: Nick H] #720802
01/01/18 9:35 pm
01/01/18 9:35 pm
Joined: May 2013
Posts: 5,004
Rotherham - S. Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,004
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: 106
MA
N
Nick H Offline OP
BritBike Forum member
Nick H  Offline OP
BritBike Forum member
N

Joined: Oct 2017
Posts: 106
MA
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: 134
Anchorage Alaska USA
M
Mitch Offline
BritBike Forum member
Mitch  Offline
BritBike Forum member
M

Joined: Aug 2001
Posts: 134
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: 106
MA
N
Nick H Offline OP
BritBike Forum member
Nick H  Offline OP
BritBike Forum member
N

Joined: Oct 2017
Posts: 106
MA
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: 3,862
Sydney Australia
B
BSA_WM20 Offline
BritBike Forum member
BSA_WM20  Offline
BritBike Forum member
B

Joined: May 2004
Posts: 3,862
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

Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.6.2