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Starting a 305 Dream WITHOUT a battery

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Sascha
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Starting a 305 Dream WITHOUT a battery

Post by Sascha » Mon Nov 22, 2010 11:24 am

So, Im wondering if a dream even needs a battery... Anyone!?
If I do run it without a battery do I run any risks? how will the bike perform? thoughts?

-Sascha

bonjour
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Post by bonjour » Mon Nov 22, 2010 12:03 pm

The coils need power from the battery.

I suppose you CAN do it if you connect the wires good, so from engine to rectifier to coils. And maybe you need a 12v voltage regulator to the coils and headlight and stuff.
Normally the battery function's as 12v voltage regulator.

But, you probably need to run along with the bike, to generate enough voltage/power , then I think it could/should be possible.

Disadvantage is that probably that you can't idle at a low RPM , so lets say, don't get it below 2000rpm or else you have to little power for the sparks needed.

It should be possible, but starting it is for what I think the biggest challenge.

However, I don't have experience with running these bike's (yet!), but from what I can tell, this is what I think and how it could be done..

But you lose a lot of driving comfort I guess..
'Of course I've already taken a very modest position on the monetary system, I do take the position that we should just end the Fed.' - Ron Paul

Sascha
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Post by Sascha » Mon Nov 22, 2010 12:11 pm

I have started the bike without a battery before and had no problem running it but it was after a long ride... It rides and starts fine without a battery when warm, as for cold, that may be another story... Thats where my questions are!

-Sascha

teazer
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Post by teazer » Mon Nov 22, 2010 12:16 pm

It is possible to run without a battery, but the charging system isn't all that strong, so you will sacrifice comfort and safety.

You need a large capacitor and some sort of insulating mounting to fit in place of the battery. Rectifier etc stays stock and you'll probably need to rewire the light switch to have all the charge coils workling from the get go.

But why do it. Batteries are available in all sorts of shapes and sizes from regular old Lead Acid, to sealed and AGM as well as tiny high powered LiPo. There's no good reason to run without a battery and lots of good reasons to fit one.

Gun
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Post by Gun » Mon Nov 22, 2010 12:39 pm

losing the battery for weight isn't reasonable considering the bike chosen. if trying to run a lighter bike then a cb should have been chosen.

if for extra storage... why not just get saddle bags/tank bag/forkbag or get creative and weld your own compartment.
you could run smaller air filters and free up room under the cover there. (not sure how a dream is laid out)

I guess that real question is WHY? :P
'65 CB77
'66 CB450k0
'93 HD FXR

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brewsky
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Post by brewsky » Mon Nov 22, 2010 12:51 pm

Ditto to the above
Not recommended to run without for any length of time.
Think of it as a sponge or shock absorber for the juice.
66 dream, 78 cb750k, 02fz1, 09 wing

e3steve
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Post by e3steve » Mon Nov 22, 2010 12:54 pm

Forty years ago I ran my first CB (on a budget!) with no battery at all for several weeks. Even to the point that I was running, later in my tenure, with scrap headlamp from a totalled Triumph Trail Blazer (T25t) 250 and with a 60/55W bulb! It was very 'bright' and I didn't blow a single bulb in the system, but it's not recommended as the excess voltage could damage both the charging and ignition systems.
Last edited by e3steve on Mon Nov 22, 2010 12:55 pm, edited 1 time in total.

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