General > General Technical Chat
Motorcycle Electrical Issues
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Njk:
If you want just to fix it, good luck, but the problem is that the permanent magnets are rotating near the winding creating electricity. It's a nice brushless design but the amount of electricity varies with RPM and there is no way to control it. In more recent alternator designs, the magnetism is created by passing DC through the rotor winding so the regulation is done by periodically switching the current on and off. Not in your case. No battery will be happy with that charger. It needs to be improved, not fixed. It was difficult back at that time, but now you can take advantage of the modern semiconductor technology.

First, you can break the winding into several sections and switch the sections with transistors. That's the best way, but it's typically difficult job to re-wind a generator, even that of single phase. So the alternative way would be to attach a light permanent RC buffer load to the rectifier output and use a switching regulator to control the voltage in the DC network.

Some guys (usually teenagers) used to street drive their motor bikes with powerful loudspeakers attached, generating a huge noise, likely with the purpose to seek the girl's attention. I'm afraid the alternator improved with switching technology will create similar noise in the RF domain. That will make no sense as no girl can hear it. But eliminating that noise seems one more design challenge.
joeqsmith:
Looks like a fun bike.   350cc single, does it have a decompression switch?   Normally, I start with compression to get an overall idea on condition of the motor.

Not that it helps but my race bike is about that same displacement per cylinder.   Guessing much lower compression ration.   I expect to see at least 140PSI cranking pressure.   Ignition timing, I used to start it around 18 and ramp to 28.  Now days, I just use a fixed 28. 

If you are sure it's electrical, you could start by using a power supply to drive the coil and points.  Skip all the other wiring and make sure the thing will run right.   

I had an old 66 Triumph Bonneville T120R that I made a chopper out of.  That thing was pretty barbaric but a lot of fun.   

***
17 year old me with my Triumph.  I had a blast building it.   Each part had a story.  Front wheel was given to me from a friend who friend had a car pull out in front of them.   The axle was bent and the rim was a pretzel.   That was the first wheel I laced.    Never lost my interest in bikes.
Njk:
Ihe idea of oversized forks is still a big puzzle for me. Fun for some guys, but is it OK from the road safety perspective?
joeqsmith:

--- Quote from: Njk on May 11, 2023, 09:10:47 pm ---Ihe idea of oversized forks is still a big puzzle for me. Fun for some guys, but is it OK from the road safety perspective?

--- End quote ---

I had lengthened the forks on my bicycles growing up so for me it was comfortable to ride as you just lay back.   Road safety perspective?  It was under powered compared to my current bike which has lots of skulls to taunt death!

***
I built a couple others if I need a speed fix.
Njk:

--- Quote from: joeqsmith on May 12, 2023, 01:39:42 am ---I built a couple others if I need a speed fix.

--- End quote ---
Looks very nice. Which catalog you're using for assembly parts selection?



BTW, what's that console (marked with red in the attached image)? Looks like "Computing across America" :)
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