Author Topic: BOYER MK 2 ignition (Read 3062 times)

222CT · « **on:** May 15, 2009, 10:53:00 PM »

Hey all, whats happening?

I recently acquired a Boyer Bransden MK 2 ignition new. the pieces I have are the plate the rotor that replaces the advance mechanical and a diode unit. Do I need one of their power boxes to run this....or I know this is a long shot but would a solid state reg/rec work good enough to run this?

or do i even need the box. i looked at their site and i guess they dont even have any info on this, i thought i found some info somewhere about this MK 2, but now i cant find nothing. i even emailed boyer and have gottn no response. no one ever ran one of these MK II?? Im guessing it is similar to the MK 3. but who knows??

lordmoonpie · « **Reply #1 on:** May 17, 2009, 04:57:48 AM »

No you don't need a power box - you have the three main pieces but they usually come with micro high output coils too - did you get those? The power box is only necessary if you want to junk your battery and have a rotor/stator in place.

Otherwise, you just run this off the standard battery, regulator rectifier...

lordmoonpie · « **Reply #2 on:** May 17, 2009, 05:01:35 AM »

If you send me your email address I've got a simplified wiring diagram for a CB350,450,750 that should work. It's over 256k and I can't reduce it or I'd post it here ....

222CT · « **Reply #3 on:** May 17, 2009, 06:10:32 PM »

well that is some great news. im very glad to hear that and thank you very much for your reply lordmoonpie, greatly appreciated.

well i did not acquire the coils sir. what coils would be a good replacement? i guess the high output micro coils obviously...but what would be a good substitution i should ask? it says on the sticker on the plate that 4ohm coils are reguired? could you use 3 ohm coils? or would 5 ohm coils work??? but then there would not be as good a spark i would think.

lordmoonpie · « **Reply #4 on:** May 18, 2009, 04:11:08 AM »

Well I'd always go with the same specificationof coil recommended by the manufacturer so 4 ohms is the way to go I think. The coils I have look very like the ones from Dyna so maybe a good place to start. Good luck!

Inigo Montoya · « **Reply #5 on:** May 18, 2009, 06:36:04 AM »

If you cant find 4 ohm, I would think 5 ohm would be ok. Most electronic devices do not mind slightly higher ohm rates, it is lower ones that can start to kill things sometimes.

78CB750CAFE · « **Reply #6 on:** May 18, 2009, 06:41:55 AM »

3 Ohm Dynas + 1 Ohm Hondaman resistor = 4 Ohm coil

222CT · « **Reply #7 on:** May 18, 2009, 03:53:08 PM »

so what does this diode do and how is it wired into the scheme of things??

222CT · « **Reply #8 on:** June 07, 2009, 09:08:50 PM »

so soes anyone have any experience at all running one of these?? I just dont understand the wiring of the diode. can anyone help....at all??

lordmoonpie · « **Reply #9 on:** June 08, 2009, 04:33:41 AM »

Where does the diode come in? I don't have a diode in any of my boyer circuits unless it's hidden in the black box (sealed)

222CT · « **Reply #10 on:** June 08, 2009, 09:29:05 AM »

the diode is bullet shaped, about 2 inches long and maybe 1/2 inch thick. one end has a yellow sire and a blue wire. the other end has just a yellow wire. instructions that boyer sent me say: disconnect the yellow wire and blue wire from the coils. plug in the yellow and blue wire from the diode to the coils. the yellow wire from the diode hooks into the yellow wire coming up from the boyer stator....the blue wire gets connected to a spare black wire coming from the wire harness. that last sentence is what i do not understand. i hook the yellow wire from the stator to the diode yellow wire. when the 2/3 hits it will fire both coils. i just do not understand.

lordmoonpie · « **Reply #11 on:** June 08, 2009, 11:51:57 AM »

Ah Ok I think I get it. You connect the diode to the coils, blue to blue, yellow to yellow for the two wires coming out of one end of the diode. The other end you have a yellow wire that shoudl go all the way down to the stator provided by boyer mounted on the end of the crank. The blue wire then gets hooked into the wiring harness - the stator on boyer ignitions always has one yellow and one blue wire coming off it (in my experience - can't say for all possible models...)

Have you asked Boyer to send you a wiring diagram?

222CT · « **Reply #12 on:** June 08, 2009, 02:19:58 PM »

they sent me 2 out of 3 pages. i guess the wiring diagram was on pg 3. thats what the instructions say....refer to pg 3 wiring diagram. i understand this is an old ignition. i just dont get the wiring for that damn diode. this was new in box also. i dont want to fry it. i have asked Boyer for help repeatedly. they dont get back to me. i guess it is reaaly obselete. they dont even want to deal with it. sucks cause its so old but thats what makes it really cool.

the stator has a blue screw and a yellow screw to hook the yellow and blue wires into.

i really like the fact that this does away with the mechanical advance.

i wonder what would happen if we just did not run the diode?

what risk would be involved?

blown coils?

lordmoonpie · « **Reply #13 on:** June 08, 2009, 02:36:43 PM »

That's right - there are two screw terminalson the stator for the yellow and blue wires to screw onto, usually with a tiny m3 nut which you have to put a blob of silicone sealer on to stop it undoing itself with vibrations.

Not sure about not using the diode - I've never seen a diode in a boyer wiring diagram before.

Do you know the exact model of the ignition? Maybe they'll send me a diagram as I'm here in the UK and have a customer record with them?

222CT · « **Reply #14 on:** June 09, 2009, 06:56:53 AM »

hey really thanks alot man for trying to help me get this fugured out. the parts numbers are

1299853

3 parts, the rotor, the stator, and the diode. thats the complete kit. i just need to figure out how to wire the diode. the stator and the rotor are already fitted. that ignition looks real nice under the points cover.

lordmoonpie · « **Reply #15 on:** June 10, 2009, 01:10:36 PM »

Did Boyer email you two pages of instructions only with the second page section f) being the one about the diode? If so - that's what they sent me too. I told them it wasn't good enough and I need the wiring diagram and guess what?! No reply...so far....

If they fail here, they'll go right down in my estimation and I've used them a lot before now...

lordmoonpie · « **Reply #16 on:** June 10, 2009, 01:11:12 PM »

...oh they did confirm, the diode is absolutely needed and suggested it could damage components if not used.

222CT · « **Reply #17 on:** June 10, 2009, 09:26:29 PM »

Yes Boyer emailed me the 2 pages.

I just really wish i had the wiring schematic. what the instructions say concerning the wiring of the diode.....I just do not understand. To me...when the 2/3 or yellow wire fires.....it will fire both coils.....lighting up all the cylinders.....thats what i get out of it. and im dealing with choppers also.....there is no extra spare black wire to hook the blue or 1/4 wire to. so what would i hook that to? just positive 12 volts or what?? or would i hook it up to the black wires going to the coils?? you see what im saying here?? i just dont get it. to me the blue 1/4 wire goes to its own coil. and the yellow 2/3 wire goes to the other coil. thats the only way i know how to do it. what those instructions say concerning the diode might as well be in japenese.

What would you do??

and THANKS again for the help LMP!

lordmoonpie · « **Reply #18 on:** June 11, 2009, 04:31:36 AM »

Well the hook up to the spare black wire from the loom would be ultimately to negative earth I think so you need to find a wire that goes to earth in your custom loom, attached to the frame?

Yes it's not very helpful to not have the diagram - I might try and draw it out myself...

Sgt.Pinback · « **Reply #19 on:** May 01, 2015, 06:00:19 AM »

Quote from: 222CT on June 08, 2009, 09:29:05 AM

the diode is bullet shaped, about 2 inches long and maybe 1/2 inch thick. one end has a yellow sire and a blue wire. the other end has just a yellow wire. instructions that boyer sent me say: disconnect the yellow wire and blue wire from the coils. plug in the yellow and blue wire from the diode to the coils. the yellow wire from the diode hooks into the yellow wire coming up from the boyer stator....the blue wire gets connected to a spare black wire coming from the wire harness. that last sentence is what i do not understand. i hook the yellow wire from the stator to the diode yellow wire. when the 2/3 hits it will fire both coils. i just do not understand.

Found one of those diodes in the workshop.

Anyone need it?

News:

Author Topic: BOYER MK 2 ignition (Read 3062 times)

222CT

222CT

222CT

222CT

222CT

222CT

222CT

222CT