Also in that link for TM we have the Yamaha Technical Bulletin kindly uploaded in Entry #5 by 5twins which pushes us back to 1971.
Another Geo Metro fan! I had two of them, that 3 cylinder Suzuki motor was amazing.
I had asked @Jim to help me figure out the approximate settings and here was his response to me.
40° is full advance.
The drain slot in the cover is the best guide. The red line is 40°. The green line is 35°
So if you set it just right of the center of the drain slot, you'd be pretty damn close.Keep in mind, plus or minus 2° will be good enough.
View attachment 200794
A slight correction. Bobs timing mark is off slightly. He found that when he indexed the rotor when he built the motor. So disregard the "just right of the center...."
That was to compensate for Bobs rotor. 35° is the right side of the drain slot.
Not too sure what you mean by suppressed spark plugs? NGK BP7ES plugs will be absolutely fine with suppressed ie resistor plugs caps. You need 5kΩ resistance in the circuit and can use either BPR7ES with non-resistor caps or the non-resistor plugs with suppressed plug caps.I have been using the NGK BP7ES plugs and plan to use the Boyer supplied caps. I understand that I can carry on using the spark plugs I have. This is correct?
I am finally going to install my Boyer system this weekend. A question about the suppressed spark plugs vs the suppressed NGK caps with the kit. I have been using the NGK BP7ES plugs and plan to use the Boyer supplied caps. I understand that I can carry on using the spark plugs I have. This is correct?
Thanks and not meaning to hijack the thread.
Bob you might want to double check that. I have a spare Boyer system and it has 5k caps. They even say 5k on them.Those nice red NGK spark plug caps that come with the Boyer are NOT resistor caps. Likewise your NGK BP7ES are not resistor plugs. If you do not have resistors in one or the other they will interfere with the proper operation of the ignition unit. So as Raymond and Paul suggested, you could switch to the NGK resistor plugs they mentioned and then use the nice red plug caps that came with the Boyer. Or what I have done on both of my 650’s is switch to the readily available and inexpensive Autolite AP63 Platinum plugs ( which are resistor ) and NGK non resistor caps , pictured here.
View attachment 207871
Bob you might want to double check that. I have a spare Boyer system and it has 5k caps. They even say 5k on them.
Mailman, with respect to your connection to provide power from the relay to the Boyer blue box and also the positive side of the Boyer coil, I am presuming you split off this wire to each of these locations. Is this correct? Also, a big rookie question here: the grey and orange wires of the original wiring harness which previously connected to the points, coils, condensers, are now all redundant and are just loose and unused, correct? Thank you.