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I am nearly finished installing the electrexworld/LaceyDucati combined ignition and generator system, quality looks good although soldering and crimping electrical connectors is a tedious affair. One of the reasons for fitting was the upgrade to 12v.
Before i try firing her up i want to fit a battery into the system so i can check charging, but the instructions give no clue as to the best one from both performance but also aesthetics.
Just double checking, do most people use 36 degrees BTDC timing?? Its a 350cc widecase 1975.

What battery have others fitted when converting to 12v. Many thanks, Ian

https://www.tayna.co.uk/quad-bike-atv-b ... gKdyPD_BwE

This was the largest capacity 12V battery I could find that fits in the battery tray. I don’t think I have this exact one, but the code numbers can be used to search for equivalents.
If you just want to fire it up, you can slave any 12V battery sat on the floor next to the bike,
Ian P

Hi Ian,

There is a thread here somewhere about batteries (I know that things are not always easy to find) and Nigel Lacey mentions a battery that he uses, which is what I went for. It is a Yamaha battery, number NTX7LBS.

Hope this helps,

Colin

Why one should thrive for "the largest battery" possible? Imho a 1975 w/c model anyway has an electronic CDI, which fires independently from a battery, like an old-fashioned magneto. You can run the engine, even while the battery is uncharged or missing.
I use(d) a Yuasa 12N5.5A-3B, https://www.sendspace.com/file/c9u338. It's footprint fits quite well into the original battery tray. As it has less height, one has to shorten the fixing strap or find a different one.

cheers Hans

Duccout wrote:Hi Ian,

There is a thread here somewhere about batteries (I know that things are not always easy to find) and Nigel Lacey mentions a battery that he uses, which is what I went for. It is a Yamaha battery, number NTX7LBS.

Hope this helps,

Colin

That's the same as mine. A bit lower than the original so I used a packer to make up the difference.

ducwiz wrote:Why one should thrive for "the largest battery" possible? Imho a 1975 w/c model anyway has an electronic CDI, which fires independently from a battery, like an old-fashioned magneto. You can run the engine, even while the battery is uncharged or missing.
I use(d) a Yuasa 12N5.5A-3B, https://www.sendspace.com/file/c9u338. It's footprint fits quite well into the original battery tray. As it has less height, one has to shorten the fixing strap or find a different one.

cheers Hans

12N5.5A-3B.jpg

My thinking was to allow the lights to eat into the capacity a bit. My bike is a 175TS with 2-wire generator (40W?) and coil/points ignition. With the lights on, I think the generator would be stretched, especially at low engine speed.

IanA wrote:Its a 350cc widecase 1975.
What battery have others fitted when converting to 12v. Many thanks, Ian

My '74 350 has no battery.

It has self-generating CDI ignition.

For the other loads (lights, horn) I regulate the alternator "charging" output to 12V DC nominal, and use no battery.
The bike has no direction indicators.

The regulator is one made for a garden tractor.

The LED tail/stop light globe at first was not satisfactory as it didn't have enough brightness at idle.
I changed it for a 6V to 30V operating voltage type and that works well at all speeds.