Yamaha 140 BETL/AETO CDI and Magneto complete rebuild

[samband63]

I have completely reverse engineered the Stator and the CDI Unit for Yamaha 140 BETL/AETO 2 stroke motor. If anybody interested in doing the Magneto and the CDI you may respond.

[ausnoelm]

If I had some idea of what you mean, or what you have done, I would be interested!

[panasonic]

I also would like to know exactly what you have done.

[boscoe99]

Reverse engineer normally means (IMO) to take a look at a design/product and then come up with ones own design and product that operates the same in form, fit and function. So, I am reading it that the OP has created his own magneto (flywheel/rotor) and CDI for a Yamaha model 140.

Given the very few that might ever need a 140 magneto and CDI, good luck in making a sale. Or even giving the design away.

[rodbolt17]

nice thing about it. the 140 does not have a magneto.

some of the old mercs did have a mag.

in fact one evening I had just finnished a mag on an old Wisconsin.
I asked the wife to hold this.

I chickened out on spinning the shaft.

I had not had dinner yet.

[panasonic]

nice thing about it. the 140 does not have a magneto.

some of the old mercs did have a mag.

in fact one evening I had just finnished a mag on an old Wisconsin.
I asked the wife to hold this.

I chickened out on spinning the shaft.

I had not had dinner yet.

Ya I bet you would not have got any dinner that night..if you had done that..lol

[panasonic]

https://youtu.be/kTXQlfT3ynU

[ausnoelm]

What happened to the reverse engineering???

[samband63]

140 BETL CDI and Magneto

If I had some idea of what you mean, or what you have done, I would be interested!

This is the PCB of the CDI. Let me give you all information about the components. I will also give you details of the stator assy with all winding information. This includes two charge coils for high and low speed running plus the lighting coil.

[samband63]

I also would like to know exactly what you have done.

The OEM CDI will cost you USD 900 and the stator for 140 BETO around USD.600

We can repair the CDI or manufacture a PCB with all new electronic components. There are altogether 6 Silicon Con*****ed Rectifiers, a couple of high speed switching diodes and few resistors in it. The schematic is quite simple. The two sides of the PCB is attached without components. I will also pass you the information and the pictures of the new stator assy that I ve done.

[pstephens46]

Madharchod is back.

[boscoe99]

Not unlike CDI Electronics (the company) reverse engineering and manufacturing CDI's, ignition coils, stators, wire harnesses, voltage rectifier/regulators, diagnostic programs, etc., etc., for many brands and models of outboard motors. At a small fraction of OEM prices.

I suspect the word "magneto" was used in lieu of the word "stator". Just different terminology for the same part. As Yamaha refers to the spark producing function of the stator by calling it a "charge" coil.

[samband63]

Reverse engineer normally means (IMO) to take a look at a design/product and then come up with ones own design and product that operates the same in form, fit and function. So, I am reading it that the OP has created his own magneto (flywheel/rotor) and CDI for a Yamaha model 140.

Given the very few that might ever need a 140 magneto and CDI, good luck in making a sale. Or even giving the design away.

Yeah, I can straight away give the design away. The stator too is quite simple. The OEM CDI is a Hitachi module.
Two bobbins for low speed running and high speed running in the stator. wounded in SWG 40 and 42 magnet wire respectively. lighting coil done with 39 turns per pole. Pictures of the construction of the stator and the CDI attached. I have traced all high speed switching diodes and the CDI can use a substitute diode. If interested I will give you a lengthy briefing about the construction of both parts. Both the Units are being tested and seems to be working in perfect condition. Bobbins for Charge coils.jpg

[panasonic]

I am interested in what you have done for my own curiosity more than anything. Like you said these components are expensive from OEM. Not knowing if this is a popular model of outboard and how many are still around being used today, are you looking to sell these? Or are you you just sharing information about what you have done for the benefit of others who may have some interest in this type of work?

[boscoe99]

I am interested in what you have done for my own curiosity more than anything. Like you said these components are expensive from OEM. Not knowing if this is a popular model of outboard and how many are still around being used today, are you looking to sell these? Or are you you just sharing information about what you have done for the benefit of others who may have some interest in this type of work?

Since you mention curiosity, how many horsepower would you guess that it might take just to run the electrical generation system of say an F150?

I am curious. I am working on a play project. Things are not what I expected them to be.

I am impressed by what folks like samband63 do. Winding a stator I can possibly do. Reverse engineer a CDI, I would be (am) lost. I know that it is stupidly simply like a truth table (just some coils, wires, capacitors, diodes, transistors and such) but the concept of what all is going on, and when, escapes me.