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I tried really hard to get my original carbs working, and failed. So I did this

I haven't thought much about all the thermistor stuff, but I can give a few pointers on the rest of the circuit. First, did you really use a 741 or is it just a leftover from the internet schematic? Use an LM358 - they're cheap, ubiquitous and about as robust as they come. LM358 inputs can be...

Yes, I think you have some weird problem like the wiring is not like you think it is because all the evidence does not add up. Purely from your latest post, it suggests you have a shorted rotor (or rotor wiring) because you can't get a volt drop like that on good wires and connections without...

Here's something that you might want to try. Get a 6V 6W bulb and temporarily wire it in series with your rotor (either end). This bulb will have a resistance about the same as the rotor. The regulator won't mind having this bulb in the circuit. You won't get full output from your generator...

This is the only XS650 I've ever ridden, but I'd like to believe it's made it like it was in 1973. Bearing in mind that previously I'd never exerienced it with fault-free carbs, I can only describe it now as delightful. It starts first kick - cold, warm or hot. It idles reliably at a constant...

I've had some useful information from here in the past, so just giving a little back. Might be of interest to some. I'm probably going to get told it's a 1973 model year. My mistake, I think it was manufactured in '72 though.