Puch Newport Engine transplant from Puch Magnum do

Chris Robertson /

Howdy Folks:

I'm helping a friend replace the engine on his 1978 Puch Newport. We've purchased a replacement engine from (I believe) a Puch Magnum.

Here's the problem:

His old Newport engine had six wires that came out of it. His new engine has four wires (one of them is the spark plug cap) coming out of it.

Has anyone every done a heart transplant like this? We've got the engine running properly, we just have to figure out how to get all the wiring hooked up.

If anyone has a schematic for the Puch Newport or the Puch Magnum, six-wire engine I would be happy to provide you with one of my kidneys (please tell me if you need the left one or the right one).

Thanks!

Chris.

Re: Puch Newport Engine transplant from Puch Magnu

Reeperette /

>>Has anyone every done a heart transplant like this? We've got the engine running properly, we just have to figure out how to get all the wiring hooked up.<<

Yes.

As for yer four wires, You have spark-wire (the cap), Obviously one's a ground wire (unless it's a body-frame ground), One has to be a hot lead, and the remaining wire probably has to do with the brake light and/or high beam headlight...usually brake light.

As fer figuring out which is which, if you don't have the proper tools you can play mix and match with a handful of dual-filament 6V/12V bulbs if you really have to, but it's much better and easier to use a voltmeter if you have one.

Most of my "conversions" have wound up going to a simpler system than original, and using a frame-ground, save in cases where a voltage regulator or battery was absolutely required, such as a Tomos A3 or engines that use a battery so as not to blow out the headlight.

Hope alla that makes some useful kind of sense to ya,

-Ree

Re: Puch Newport Engine transplant from Puch Magnu

Chris Robertson /

Hi:

I was worried it might come to that! I'm grateful to the Moped Gods for a few things, though:

1. The Puch's magneto and engine are one unit so there's no ignition wiring to worry about.

2. There's only three "mystery" wires.

3. Mopeds don't have things like CD Players, GPS systems, and clocks along with the complicated wiring that goes with them.

My guess for the three remaining wires are: ground, +6V, and engine kill.

Can anyone tell me if I'm way off in my assumption?

I'll get the ol' voltmeter out and try to figure out what does what in the next few days.

Thanks for your help, Ree!

Chris.

Re: Puch Newport Engine transplant from Puch Magnu

HI, you ever consider using the wiring harness that goes to the new motor? I think it may save you time and headaches. GOOD LUCK DOUG D.

Re: Puch Newport Engine transplant from Puch Magnu

Ron Brown /

Chris,

Keep looking for a schematic. If you connect the wires incorrectly, you run the risk of burning out bulbs, or worse jet, the alternator coils.

If these engines are basically identical, can you use the alternator and flywheel from the old engine.

Ron

Re: Puch Newport Engine transplant from Puch Magnu

Chris Robertson /

Hi Ron:

Swapping magnetos isn't such a bad idea! I'll try that as a last resort.

I hooked the wires up to the ol' multimeter, and this is what I found:

Black wire: engine kill (ground it and engine dies).

Yellow wire: 12V

Green and Red wire: 6V

My question:

What in the world am I supposed to do with 12 volts? When I bought the engine, the 6V and 12V wires were connected together. Should I leave them that way?

Thanks!

Chris.

Re: Puch Newport Engine transplant from Puch Magnu

Ron Brown /

Chris,

I thought I answered this yesterday. Must have clicked the wrong button!

You need wiring diagrams or another ped to look at. As for connecting a 6 to a 12 volt wire, makes no sense to me.

Ron

Re: Puch Newport Engine transplant from Puch Magnu

gimmejimmie /

I think the 12v might be for the brake light/highbeam like what Ree mentioned, according to my shop manual, (Minarelli Electrical System)

" the primary ignition coil puts out 12v at approx. 20 watts to be used for accessories, such as a stop light circuit. The primary ignition coil supplies the power to drive the high tension coil as it's primary function."

I don't consider a brake light an accessory, definately a necessity, and a brighter 12v bulb makes sense. As for a 12v accessory, use it for a radar detector.:)

Re: Puch Newport Engine transplant from Puch Magnu

Chris Robertson /

Don't get me started about radar detectors! I just got my radar detector siezed a few weeks ago. They're illegal here in Ontario, and the cop searched my car without my permission. I knew he had no way of knowing I had I radar detector (Bel 980) because it is undetectable to the technology they use (VG-2). Of course, maybe seeing my brake lights flash when he zaps me with a healthy dose of K-Band microwaves might have be a legal reason to search my car...

But I digress.

I thought that the 12V was for the brake light as well. However after a few seconds holding down the brake handle, the bulb burned out. It seemed AWFUL bright before it shuffled off this mortal coil of ours...

Ron, I think it was you that mentioned that some magnetos depend on everything being hooked up at the same time to put enough load on the power supply to reduce the voltage/amperage to a working level. If this is the case, I'm screwed! I'm never going to get everything hooked up properly. It looks like the wiring job is homemade to begin with (i.e. blue wire leaves the headlight, and arrives at the harness connector as a yellow wire due to splicing inside the frame). I've found many Puch schematics, but they only resemble the wiring job on this ped at best!

For what it's worth, I'll be taking one of your earlier suggestions, and try to get the magneto from the old engine plugged into the new one. At least I can then just hook it up to the rat's nest as it existed before.

Chris.

Re: Puch Newport Engine transplant from Puch Magnu

Are you able to get youir hands on a set of drawings for a puch 1977 puch newport? I would like very much to look at one myself, since I need to work on the moped i just bought. Thanks.

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