I converted my TE20-85 to 12V - and it starts a lot better now than it ever used to. You will need to remove the voltage regulator box as the alternator won't need it, but otherwise the wiring is pretty straight forward. I've heard a number of people here say that you will never burn out a 6V starter on 12V, but I still try not to run it for too long. In theory at least you are halving the current going thro the starter, so it should be OK . . . . . If you don't want to get into the re-wiring, then put a 12V dynamo in and change the voltage regulator for a 12V one. OK, you will only get around 8 to 10Amps when charging as against a possible 60A off an alternator (depending on size and type), but if you aren't forever starting and stopping the engine, it won't make much difference. I had to change it all on mine because the wiring was perished and a fire hazard with all that petrol about, and I had an alternator sitting around. A 12V dynamo conversion would look neater, and you wouldn't need to hunt for a different length belt to fit the alternator set-up. Just remembered also that I get no charge on mine until I'm running at about half throttle - because even with a small pulley on the alternator, it only picks up enough speed to charge well up the rev range. You wouldn't get that problem/issue with a dynamo. Just some thoughts.
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