Hi, I'm looking at replacing the piston rings on my AJS 600 twin, but can't identify the piston type. There is a size stamped on top of the piston (72.8), but nothing else. The club spares stock rings and states that they are for GPM pistons only, just checking if they are suitable. Also 0.8mm = 31.4961 thou., so would I need +.030 rings? See photo of piston attached, any help would be appreciated.
Cheers Mark.
Model 30 Piston Identification.
-
- Member
- Posts: 13
- Joined: Thu Aug 23, 2018 11:47 am
- Location: Warwickshire UK
Model 30 Piston Identification.
You do not have the required permissions to view the files attached to this post.
-
- Member
- Posts: 1698
- Joined: Mon Jan 01, 1990 12:00 am
- Location: WEST SUSSEX UK
Re: Model 30 Piston Identification.
if its marked as metric then its a pattern +030" ( +0.75mm)
best thing is to measure old rings
if was a genuine it would have BHB on crown
but tha'ts my guess ! , alternatively talk to Cox and turner and they can advise 01935 826816. Email: ian@coxandturner.co.uk.
best thing is to measure old rings
if was a genuine it would have BHB on crown
but tha'ts my guess ! , alternatively talk to Cox and turner and they can advise 01935 826816. Email: ian@coxandturner.co.uk.
- Duncan
- Member
- Posts: 2216
- Joined: Thu Jul 10, 2003 1:00 am
- Location: HAMPSHIRE UK
Re: Model 30 Piston Identification.
Mark are there any markings inside the piston?
-
- Member
- Posts: 13
- Joined: Thu Aug 23, 2018 11:47 am
- Location: Warwickshire UK
Re: Model 30 Piston Identification.
Thanks for the Cox and Turner contact, i'll contact them tomorrow... What measurement info. would they need from the rings?, never measured any before, only the gap clearance when inside the cylinder.
No markings at all Duncan...
No markings at all Duncan...
-
- Member
- Posts: 1698
- Joined: Mon Jan 01, 1990 12:00 am
- Location: WEST SUSSEX UK
Re: Model 30 Piston Identification.
thickness of old rings , and width , that should tell them if its metric and obviously the cylinder size
-
- Member
- Posts: 13
- Joined: Thu Aug 23, 2018 11:47 am
- Location: Warwickshire UK