Dunstall 810 rings

Norton Barn Find · Dec 5, 2024

Hi all, I'm new to the forum, so bear with me. I've acquired what appears to be a 1971 Dunstall 810. It is literally a barn find, the license plate expired in 1975. The engine wouldn't turn over, so I pulled the head and barrels off. the rings on one piston were free, but the others were stuck. Even being extremely careful I broke a ring. Does anyone here know where I can buy a set of rings?
Thanks!

kommando · Dec 5, 2024

A last resort if you can't find rings.

Norton Dunstall 810 CC piston complete LH only 76.25 mm - Obsolete Bike Parts

Norton Dunstall 810 CC piston complete LH only 76.25 mm - Condition: N.O.S. Made in Italy by GPM Sticker not included

www.obsoletebikeparts.com

Worth an inquiry to

Total Seal® Piston Rings | Performance Piston Ring Manufacturer

If It Takes a Piston Ring, We Can Build It! Since 1967, Total Seal has been the authority in piston ring design and technology for Vehicle, Diesel, Industrial, Marine and Aviation applications.

www.totalseal.com

Norton Barn Find · Dec 5, 2024

kommando said:
A last resort if you can't find rings.

Norton Dunstall 810 CC piston complete LH only 76.25 mm - Obsolete Bike Parts

Norton Dunstall 810 CC piston complete LH only 76.25 mm - Condition: N.O.S. Made in Italy by GPM Sticker not included

www.obsoletebikeparts.com

Worth an inquiry to

Total Seal® Piston Rings | Performance Piston Ring Manufacturer

If It Takes a Piston Ring, We Can Build It! Since 1967, Total Seal has been the authority in piston ring design and technology for Vehicle, Diesel, Industrial, Marine and Aviation applications.

www.totalseal.com

Thank you. I checked out Total Seal, but couldn't find them listed. I'm hoping to find something more local, but Obsolete Parts might be the backup.

kommando · Dec 5, 2024

You don't look on Total Seal by name but by dimensions. 76.25mm is as close you can get to 3.000", so look for their rings for a 3 inch bore.

Norton Barn Find · Dec 5, 2024

kommando said:
You don't look on Total Seal by name but by dimensions. 76.25mm is as close you can get to 3.000", so look for their rings for a 3 inch bore.

I'll try again tomorrow. Thanks!

dobba99 · Dec 6, 2024

Try this company https://www.coxandturner.co.uk/ They had .060" oversize rings for a 1938 Coventry Eagle on the shelf and delivered them the next day!

Norton Barn Find · Dec 6, 2024

Great, thank you!

rotorwrinch · Dec 6, 2024

Don't let it be known that I shared this with you. Get a set of standard rings for a Triumph T140. Dimensionally they are the same animal.

ludwig · Dec 7, 2024

Dunstall 810 barrels have a poor reputation.
Think twice before pooring money into it.

baz · Dec 7, 2024

ludwig said:
Dunstall 810 barreels have a poor reputation.
Think twice before pooring money in it.

I agree
Especially if the liners have shown any sign of movement

Dunstall 810 rings

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