1966 Honda 305 Firing Problems HELP !!!!!!!!
How are you measuring volts at the points. Because they are a ground you can get a "shock" if you touch them. I think if the points were the problem it would not run at all. A coil will fail if it gets too hot but you are not riding far enough for the coil to normally get that hot.
The test again is to carry a spare plug and see if it fires when the problem happens or could hold on the plug wire and see if you get zapped. This could be some weird electrical problem but as you describe it sure sounds like fuel. You need to eliminate one or the other so we know what to do next. 12v at pointsIf you have 12 v at points when it quits, the only electrical problems could be the coil or something in the high tension wires. Are you sure you are losing spark when it quits?
It sounds like cadman was right that it is a fuel problem after all. Have you unplugged the fuel line at the carb to see if it will keep a good steady flow and there is not a plug of some kind up stream? I'm going to agree with cadman here and suggest fuel starvation.
This happened to us when our '64 Dream 305 was new to us and had been sitting. It ran fine for a few weeks, but then it started doing what your bike is doing. Since the old petcock was stuck open on Reserve all the time, fuel would constantly seep into the bowl through the open float valve. When I removed the carburetor and disassembled it, paying very close attention to every little thing as I took it apart, I discovered two problems: 1) the float was perforated and that would let fuel spill onto the ground from the overflow tube. 2) There was a wad of fluffy crud that was sitting on top of the float valve, preventing full flow of fuel into the bowl. It looked like a tiny wad of hair with a bunch of rust flakes in it. So I figured out what was happening. The bike was using fuel faster than the float bowl could fill, even with a sinking float, and it would die. But let it sit awhile, the overflow tube would begin to drip. You could then ride for a mile or two and it would quit again. Once I cleaned and rebuilt the carb with new float and gaskets, it ran great. Even though fuel gets to the carb well, there may be clogging in the carb that has come from the tank. Install a small inline filter to prevent new/old crap from clogging jets/float valve. I forgot to mention, that I had ALREADY cleaned the carb a week prior to this weird behavior. So the old float gave out, AND the crud, newly unsettled from the tank, made it to the top of the float valve... The fact that it reliably runs, albeit for a limited time, would suggest to me that it's not electrical. Mine: '74 CB750 K4 -- Hers: '64 CA78
Had: '75 CB550 K, '79 CT90
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