Thanks both, I got the spec as 53030.
I dug out an old photo
I have found many for sale with the product code 53034. These are used in Caterhams but are not appropriate because the terminals are reversed.
My original problem is that the Yuasa 53030 battery that i fitted last year started leaking.... onto the front brake hose which sits below the oil tank... which was not ok.
It also had to be put in a special cradle i made because it was too wide for the M3W battery cradle.
The last retail outfit to be selling the correct battery say they are struggling to find any at the moment. I guess i will have to ask MMC, or change to a third option.
I see an AGM technology non-leak battery on the web. £££ but a slightly higher cold crank rating and smaller.
http://www.tayna.co.uk/53030-BMW-Westco-Motorcycle-Battery-P3397.html I think i will go for that.
Charles
