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Roadster battery.

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Roadster battery.

Posted by neil_hall at November 23. 2018

Hi. I have just had an Alton electric start fitted to my 850 mk2a Roadster 1975 today.

The battery tray fitted to the bike is the standard size tray. Any advice on where I can purchase a battery of 20 amps rating and would fit into the standard  mk2a tray would be greatly appreciated.

thanks Neil.

Re: Roadster battery.

Posted by john_holmes at November 23. 2018

A year would help as the tray did change, 850 mk2 to mk2a was one change.

Re: Roadster battery.

Posted by neil_hall at November 23. 2018

Previously john_holmes wrote:

A year would help as the tray did change, 850 mk2 to mk2a was one change.

It’s a mk2a Roadster 1975.

Re: Roadster battery.

Posted by john_holmes at November 23. 2018

There is a Motoblatt with 4 terminals used as an upgrade on the MK3 which uses the same tray. I will try to post the number tomorrow.

Re: Roadster battery.

Posted by neil_hall at November 23. 2018

Previously john_holmes wrote:

There is a Motoblatt with 4 terminals used as an upgrade on the MK3 which uses the same tray. I will try to post the number tomorrow.

That would be great thanks. I currently have the Motobatt MB9U fitted which I think is 14 amps, so I will have to have a better battery fitted.

thanks Neil.

Re: Roadster battery.

Posted by john_holmes at November 24. 2018

CT14-A2

 

https://www.nortonownersclub.org/noc-chat/technical4-commando-forum/130224675

 

CCA is more important than AH, CCA is the peak amps that drive the starter, AH is how long it will give the CCA out.

Re: Roadster battery.

Posted by david_broadbent at November 24. 2018

A great coincidence as I was just considering the very same question! My 2A is a 1973 and I had a bit of a worry when I saw the Alton video and how the monster battery was fitted fore and aft in the battery tray rather than across the frame as mine currently is!

I enclose (hopefully) a snap of my existing battery box which hopefully somebody will recognise as pre or post mod and then tell me what battery I need to buy if I go the Alton route?

As you can see I have modified my bike to fit a Mikuni carb so the original big plastic air filter box is currently in the loft. At the same time I took the opportunity to fit the ignition switch in a better position - now it doesn't fill up with water as it did when facing forwards! The result is that there is not much spare room beyond the confines of the originally designated battery space.

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Re: Roadster battery.

Posted by francis_vidril at November 25. 2018

In your case you can put with no problem at all DEKA ETX15, it is what I have on my 850 MK3 for 6 years.

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