Honda TL125 to CB125S Engine swap......
Hi guys. Im a newby to the forum and live in UK.
Im after some advice if I may from some of the gurus here.
Apologies in advance for my first post being a cry for help!
I have a few bikes and last year added a 1976 Honda TL125S to the stable.....
A great little bike which one day I'll fully restore but at the moment the novelty of riding and enjoying it hasn't worn off yet!
One thing I have done tho is removed all the lights, indicators etc etc from it and made it a day-light only bike for the road/offroad.
I also reduced the wiring/ignition to purely a kill switch, coil, points and spark plug which was an easy job like this......
Earlier this year I bought and restored a CB125S engine from the same era, with a view to fitting it o the TL (its a direct swap) and then stripping the TL engine to give it some TLC.
Here's the CB lump......
I had hoped to carry out the minimalist wiring/ignition mods on this one and mistakenly thought it'd be the same as the TL as they're both 6V points engines which are almost identical.
I was wrong!
The CB125S wiring diagram is here.....
This diagram showns it has a reg/rec and three wires from the alternator.
No matter what Ive tried the most I can get from the CB engine is a very weak spark which isn't enough to get the thing running.
I fitted a reg/rec and also tried a battery (in case it was needed) and fitted new points and set timing but still no good. I am using the original TL coil.
So here I am, hoping someone may be able to lend some advice!!
Can any of the guys here who understand these things suggest a simplified diagram to show only the ignition system for the CB, similar to the minimalist dwg for the TL above, which an electrical-knowledge-lacking amateur like me could understand!?
Would be eternally grateful if you could!
Read responses in advrider.com