'09 610.. stranded with a stuffed battery.

[Stroker Ace]

Man, you guys are WAY over my head but I like this idea to get yourself out of trouble in a pinch. For what is worth, I REPLACED the battery in my 1984 XT 600 Yamaha with a capacitor just to save weight!!! Of course it kick started, but I had no electrical problems at all**************************************** I ran it like that a couple of years before I sold it, and the second owner ran it past the 30,000mi. mark. But I don't remember the numbers of that capacitor, I remember it was about 3/4"dia. by 3" long......

Just thought I would chime in...... Thanks.....

 

[BrandonR]

Have you tested your capacitor idea?

Click the link I posted and watch the test.

Here it is again:
http://www.youtube.com/watch?v=F1C14A2rVbc

And further information, yes the bike will bump start with only the capacitor.

 

[Coffee]

Click the link I posted and watch the test.

Here it is again:
http://www.youtube.com/watch?v=F1C14A2rVbc

And further information, yes the bike will bump start with only the capacitor.

What happen if you try to rev it up without the capacitor?

Does it rev? Does the light flash less?

 

[lankydoug]

Click the link I posted and watch the test.

Here it is again:
http://www.youtube.com/watch?v=F1C14A2rVbc

And further information, yes the bike will bump start with only the capacitor.

Looks like your problem is solved. By the way positive to positive and negative to negative with the battery disconnected is not wired in parallel it's in series. Post to post across the battery with the battery connected is in parallel with the battery.

 

[BrandonR]

What happen if you try to rev it up without the capacitor?

Does it rev? Does the light flash less?

It coughs and sputters but will rev up I never really tried watching the light while doing it. I can say that it's hard to get the bike moving without a battery because it shuts down pretty quick.

 

[BrandonR]

OK, so here's the evidence, warning it's just video of the oscilloscope screen.

I probed the system at the positive battery terminal.

First, the battery is connected, then just the capacitor and finally the capacitor gets disconnected. You can see there's no built in filtering, the waveform goes to zero with each pole of the stator.

http://www.youtube.com/watch?v=X1x_w...zpLjmhzRk8hi3g

 

[Coffee]

First, the battery is connected, then just the capacitor and finally the capacitor gets disconnected. You can see there's no built in filtering, the waveform goes to zero with each pole of the stator...

Which is normal... a battery is the best filter there is, a simple capacitor takes a lot of the higher frequency AC out, but without anything there is no filtering at all.

EDIT: I just reviewed what I typed earlier in this thread... seems I am repeating myself - sorry!

As an aside, nice to see a tek 2230 again. My guess would be the scaling might have been 10V/div and AC coupled.

 

[BrandonR]

I picked up the scope for cheap at the university surplus store, it may not be the latest but it was good enough in it's day I don't know what half of the buttons and knobs actually do

What we can see of course though is that the voltage regulator is doing it's job (no crazy voltage, no matter how far I zoom into the waveform) and so is the rectifier (never goes below 0). The capacitor is doing enough smoothing to keep the computer happy and everything else seems fine with it.