Navigation

You are here: Home / Messages / Electrical / Boyer Powerbox

Boyer Powerbox

Up to Electrical

Boyer Powerbox

Posted by steve_nairn at November 21. 2017

Hi there - just finishing up a Commando with twin headlights and have fitted new alternator (150w two phase) and boyer ignition.

I was going to replace the rectifier with the newer type - but not sure what to do with the zener diode which I have read is limited to 100w? 

I have been looking at the Boyer power box - will this take out the rectifier, the Zener diode and the capacitor?

Is there a better option?

Re: Boyer Powerbox

Posted by mark_woodward at November 21. 2017

Hi Steve, in a word - yes. There are quite a few rectifier/regulators on the market - most are pretty good but ensure you give whichever you opt for a bit of ventilation or, at least, bolt it to a good metal surface to act as a heat sink.

Re: Boyer Powerbox

Posted by steve_nairn at November 21. 2017

Thanks Mark - I will try the power box and figure out best place to mount it, bike has a fairing so maybe under the battery tray in front of the horn.

I thought it would be relatively easy to replace rectifier/zener diode but was not sure if it also eliminated the 2MC capacitor. Steve

Re: Boyer Powerbox

Posted by john_holmes at November 21. 2017

It does eliminate the 2MC but the one inside the powerbox is the same quality and likely to fail as frequently as the 2MC ie it ages. It then, depending on how it fails, just becomes a useless black box or a combined ignition reg/rect. Better to go without the powerbox and fit EI plus a combined reg/rect with a good capacitor that you can get to and change when it fails as they all do.

Re: Boyer Powerbox

Posted by Neil Wyatt at November 21. 2017

I have Boyer power boxes fitted to most of my bikes but the one on my ES2 failed on the way to the IOM MGP this year. Poor Joe Lucas got the blame but turned out the Power Box failed and did not allow the battery to charge from the alternator. I sent it back with a cheque but will have my cheque returned as they have already told me it is knackered.

This was disappointing (Would have been worse if I missed that boat) as I never had a Boyer product fail before.

I understand our Mr Osborn sells his own unit. Since the new box for my 57 model 50 is now on the ES2 I rather thought I'd try the Osborn unit.

Anyone tried one of these alternatives?

Re: Boyer Powerbox

Posted by Alan Throssell at November 21. 2017

I also had a Boyer Power box fail on route to the IOM (in 2007). Boyer posted one to me while on the island for a large amount of money. That replacement failed a couple of years later. I then bought one of Al Osborns (A.O. Services) regulator/rectifier units combined with one of his capacitors (his replacement for the 2MC). I've not had any problems since. I recommend the A.O. Services "A-Reg One" Regulator/rectifier unit. I believe it can be used on systems up to a maximum 180W.

Hope this helps, Alan

Re: Boyer Powerbox

Posted by nigel_keating at November 22. 2017

Previously steve_nairn wrote:

Hi there - just finishing up a Commando with twin headlights and have fitted new alternator (150w two phase) and boyer ignition.

I was going to replace the rectifier with the newer type - but not sure what to do with the zener diode which I have read is limited to 100w?

I have been looking at the Boyer power box - will this take out the rectifier, the Zener diode and the capacitor?

Is there a better option?

I'm using one that RGM sell. Very cheap and unbranded. Can't be any worse than the expensive ones?

Re: Boyer Powerbox

Posted by Alan Osborn at November 22. 2017

Further information-the above is about right and I can confirm after having spent some 40 yrs in selling these items. I sold the Boyer unit many years ago but eventualy stopped as the failure rate and the cost both increased. Within the last few years I have been selling a product sourced in China that is lot cheaper and a bit more reliable. As per Alan T above. The further service I offer is also to be able to test these items. 

In fact the original rectifier and Zener is still a viable system, despite its age and the fact that the Lucas Zener is no longer avaiable. (alternative Zeners are NOT up to the job) But as above once you want greater than the 100W capability of the Zener then you are in trouble.

The 2MC capacitor, yes the Lucas ones do seem to fail eventualy and the Boyer one fails, but the one I sell has yet to prove unworthy.

There was alot of interest in the use or not of the 2MC some years ago in Roadholder. My point of view is that it is NICE to have but not esential. Very nice to have if you want to run without a battery and I can prove that having the capacitor on the 6V reg/rectifier actualy increases the charge current by reducing the ripple.

Powered by Ploneboard
This is Brio Diazo Plone Theme