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Best battery to fit a MKIII?

Classic Norton Commando Motorcycles.

Re: Best battery to fit a MKIII?

Postby Clanger » Thu Mar 16, 2017 9:39 am

Sorry, I have no idea.

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Re: Beshttp://www.ebay.com/itm/like/25t battery to fit a MK

Postby Deets55 » Thu Mar 16, 2017 9:43 am

jimbo wrote:will the guts work in this starter when used with the Norton parts ?
http://www.ebay.com/itm/New-Starter-Fit ... cW&vxp=mtr


http://www.nortonownersclub.org/support ... rter-motor

http://www.ebay.com/itm/like/2527830321 ... noapp=true

http://www.ebay.com/itm/HARLEY-DAVIDSON ... 0201402946

This might help you out:



But as Dyno Dave stated a good 2 brush starter should be fine.

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Re: Best battery to fit a MKIII?

Postby L.A.B. » Thu Mar 16, 2017 10:33 am

Note that there is a '4-brush' conversion as sold by RGM which gives a small power increase.........
http://www.rgmnorton.co.uk/buy/starter- ... o_2109.htm

......and the more powerful '4-field coil' conversion.
iii-starter-motor-field-coil-brush-upgrade-t970.html#p6625
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Re: Best battery to fit a MKIII?

Postby jaydee75 » Thu Mar 16, 2017 11:14 am

jimbo wrote:will the guts work in this starter when used with the Norton parts ?
http://www.ebay.com/itm/New-Starter-Fit ... cW&vxp=mtr


That's exactly what I did when I upgraded my starter, bought a new HD starter. That looks right, all I know is mine had "Prestolite 66" on it and was for an 80"s Sportster.
I can help you with the mod if you need it. I took some pictures as I did the mod.
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Re: Best battery to fit a MKIII?

Postby Deets55 » Thu Mar 16, 2017 11:34 am

L.A.B. wrote:Note that there is a '4-brush' conversion as sold by RGM which gives a small power increase.........
http://www.rgmnorton.co.uk/buy/starter- ... o_2109.htm

......and the more powerful '4-field coil' conversion.
iii-starter-motor-field-coil-brush-upgrade-t970.html#p6625


Les
I didn't realize it was possible just to add the extra brushes without the field coils. I guess the brushes opposite each other wired together?
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Re: Best battery to fit a MKIII?

Postby L.A.B. » Thu Mar 16, 2017 11:52 am

Deets55 wrote:I didn't realize it was possible just to add the extra brushes without the field coils. I guess the brushes opposite each other wired together?


Yes.
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Re: Best battery to fit a MKIII?

Postby jimbo » Thu Mar 16, 2017 12:24 pm

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Re: Best battery to fit a MKIII?

Postby L.A.B. » Thu Mar 16, 2017 12:35 pm

jimbo wrote:then all we need is?


If you want to convert to it to 4-brush operation (and I expect dynodave would say it's not worth the effort) then yes, but if you want to do the full upgrade you will also need the Harley Prestolite field coils.
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Re: Best battery to fit a MKIII?

Postby jaydee75 » Thu Mar 16, 2017 1:37 pm

Jimbo, the advantage in getting the HD starter is that you get the 4 brushes, the brush holders, and the field coils. You have to use the "Norton" armature because of its unique pinion gear.
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Re: Best battery to fit a MKIII?

Postby jimbo » Thu Mar 16, 2017 1:47 pm

L.A.B. wrote:
jimbo wrote:then all we need is?


If you want to convert to it to 4-brush operation (and I expect dynodave would say it's not worth the effort) then yes, but if you want to do the full upgrade you will also need the Harley Prestolite field coils.



Maybe I should buy this used one for all the parts? Coils, body, brush holders, springs? Then just get new brushes?

http://www.ebay.com/itm/1975-1985-SPORT ... qn&vxp=mtr

Or just get a new one?

http://www.ebay.com/itm/NEW-STARTER-MOT ... 9I&vxp=mtr
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Re: Best battery to fit a MKIII?

Postby L.A.B. » Thu Mar 16, 2017 1:58 pm



It depends whether that motor body can be adapted to take the Norton armature and drive end plate?
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Re: Best battery to fit a MKIII?

Postby Fanfan26 » Thu Mar 16, 2017 3:01 pm

jimbo wrote:What's the best battery to fit a MKIII with the standard MKIII( small) battery tray using the E start?




I have DEKA ETX15 AGM 220 CCA (made in USA) since 6 years on ma 850 MK3 with électric start only,no kick,and air filter 750 (not box black) The space is sufficient,i am very happy of this choice : http://www.batteriesmoto.fr/batteries-d ... tx14l.html

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Re: Best battery to fit a MKIII?

Postby JimNH » Thu Mar 16, 2017 6:42 pm

Unless you have a 4 brush motor with the associated field coils and just use the Norton armature just go with a Dyno Dave starter. It's a bullet proof unit for reasonable money. Order it and bolt it in, problem solved.

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Re: Best battery to fit a MKIII?

Postby crusadersports » Tue Mar 21, 2017 3:07 am

Deets55 wrote:http://www.odysseybatteries.com/batteries/pc625.htm

This is what I use , but I had to shoehorn it in. I think there is one that is slightly smaller but I don't know much about it.


Deet, More details please on how you got the PC625 in there. Have you removed the strap mounting point at the other end of the tray to get it further in, hard up against the oil tank? And what's that buckle you've got between the battery strap and the clip? More pics please!
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Re: Best battery to fit a MKIII?

Postby Deets55 » Tue Mar 21, 2017 4:30 am

crusadersports wrote:
Deets55 wrote:http://www.odysseybatteries.com/batteries/pc625.htm

This is what I use , but I had to shoehorn it in. I think there is one that is slightly smaller but I don't know much about it.


Deet, More details please on how you got the PC625 in there. Have you removed the strap mounting point at the other end of the tray to get it further in, hard up against the oil tank? And what's that buckle you've got between the battery strap and the clip? More pics please!


I filed a little relief in the battery case and raised the battery up in the battery tray to clear the area where the strap mounts to the battery tray near the oil tank. I also made as much room as I could above the battery by moving wires around. I tried to insulate the battery from the oil tank by using a piece of Dyno-Mat but that just melted down into a sticky mess. The battery strap does space the battery off the tank slightly. I still wouldn't mind finding some very thin flexible insulating material to place in there, not much room, possibly an 1/8". The front strap bracket I made from some scrap steel, it hinges in the front. That way it drops down out of the way when I unhook the strap. I believe this is the third or fourth season with no problems.
Hope this info is helpful.
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