Can someone let me know te ring gap for an rb20, i think it might be .5 but im not sure.
Thanks
sef
Ring gap please
-
- registered user
- Posts: 1900
- Joined: Wed Jan 14, 2009 12:21 am
- Contact:
- jonashford
- registered user
- Posts: 445
- Joined: Wed Oct 20, 2010 4:47 pm
- Main scooter: Lambretta SX RB235
- Location: GRIMSBY
- Contact:
I think it's on afs site
-
- registered user
- Posts: 1900
- Joined: Wed Jan 14, 2009 12:21 am
- Contact:
jonashford wrote:I think it's on afs site
had a look on AF site but couldnt find this info. anyone know or point me in the right direction
ta
-
- registered user
- Posts: 4823
- Joined: Tue Oct 25, 2011 9:50 pm
- Main scooter: Lambretta
- Location: Lanarkshire
- Contact:
According to the fitting instructions 0.6mm (0.0025") is the gap at which the rings should be replaced
http://www.afrayspeed.co.uk/index.php?page=Per_rb22
http://www.afrayspeed.co.uk/index.php?page=Per_rb22
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
-
- registered user
- Posts: 1900
- Joined: Wed Jan 14, 2009 12:21 am
- Contact:
rosscla wrote:According to the fitting instructions 0.6mm (0.0025") is the gap at which the rings should be replaced
http://www.afrayspeed.co.uk/index.php?page=Per_rb22
Thanks for that, looked at that page but couldnt see it for the life of me. New Rings are giving me .5. I guess thats near enough....

-
- registered user
- Posts: 4823
- Joined: Tue Oct 25, 2011 9:50 pm
- Main scooter: Lambretta
- Location: Lanarkshire
- Contact:
Just so it's clear that is the gap they recommend REPLACING the rings at.
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
An easy way to remember is approx 0.1mm per Inch/25mm of bore.
Best Regards
Chris
Chris
-
- registered user
- Posts: 1900
- Joined: Wed Jan 14, 2009 12:21 am
- Contact:
I replaced the AF piston that came with the kit with a DT175/blaster piston. Bloke was shutting down his motorbike shop and had a box full of nos pistons that he had knocking about since the 80,s he pulled 2 of these out and said these should fit which they did. Both me and my mate stuck in our rbs to see what they were like and both bikes went better than before so we kept them in. Only cost a £10 as well....Muppet wrote:0.3 is good but never less than 0.2,
muppet,

Anyways when we went to replace the rings the gap was just under 2.0, with the new rings the gap is back down to 0.5
Im guessing that as its no longer an AF barrel this would explain it not being 0.3 with new rings. Thought it was a tad low on compresion....
