Battery Only Ignition

[tonyp]

I'm planning a C15 trials bike and thinking of ditching the alternator and just using a battery. This will also allow me to re-work the LHS cover and reduce width and a bit of weight.

- What type of battery do people use ?

- Is anything else needed beside standard coil, condenser, and points ?

- Has anybody tried this with Boyer-Bransden ?

- What amp/hour rating is best?

- 6v or 12v.

- How many hours trialling do you get before a recharge is needed ?

[totalshell]

why bother with the battery .. all you need is essentially a big capacitor that will provide enough of a spark to start the bike and it'll run fine I used one on my bullet got it from some one like bradford ignitions in TMX it was about the size of a fag packet and did the job brilliantly Where as your batterys going to need charging all the time and you never know when it will run out

[brian h]

I have experience with a 12V dry cell battery "total loss" ignition system on a Triumph Cub - works OK, I cannot recall the Ampere Hr rating, short circuit Trials are usually no problem in time duration, I would not like to risk any battery holding out on a C15 on a long Trial unless you have a charged second battery available along the way. This system is possibly the least expensive method, however there are a couple of reliable solid state systems available which would cost more but very reliable and be the preferred option to check out.

The original C15T Lucas Energy Transfer system worked from new, however, after some distributor / ign system / engine wear took place, breakdown of the alternator stator in oil etc, the spark quickly dissappeared, forcing many to convert into battery / coil ignition until the later solid state ign development.

If you choose to go the total loss ign system way, various sizes of Japanese 12V dry cell batteries are normally available from battery suppliers, choose the biggest capacity Ampere hour battery you can buy that will fit the space available on you bike. The C15 would be very similar to the Cub in the ignition department I would suspect.

Standard 12V HT coils for Japanese bikes are normally available (smaller and lighter than standard car ign) the only other item is an ign switch - and remember to use it !!

Brian H