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Hello and thank you for any wisdom here for a mid-flight full DOA stall roadside failure town truck call.

  • Battery fully charged
  • Idle pre-ride was not stable, 1200 - 2000 oscilating, slightest idle screw movement had significant impact
  • Bike was just tuned (maybe badly)
  • Bought bike with electronic ignition (no points), bike would not start since mecanic said cylinders 2-3 had reverse polarity off electronic ignition, so he put points back in...
  • Bike started well, sounded good, rode well for 5 miles , low speed - 40-50 mph then suddenly died, no indicators

Thank you for any ideas...

Red Flag: I eas forced to send bike to a garage I have not dealt with before and I am concerned they will fleece me on an exxegerated re-build to find problem hence I woudl like to propose direction... Maybe fuse? And where is fuse? I've had this thing for a week.

Tire Fuel tank Wheel Automotive fuel system Vehicle
 

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Fun bike, I had one of those, there is a fuse behind the side panel is there not? It looks too nice not to run good, it's gotta be something simple.
 

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"cylinders 2-3 had reverse polarity off electronic ignition, so he put points back in..."
sounds weird, if the wires were reversed that is not polarity, and if he put in electronic ignition did he get a spark or not :unsure: hard to imagine he didn't get a spark, hard to imagine it can't be made to run as stock too.

Have the valve clearances ever been adjusted? They need to checked if it does not start well or changes when it gets warm, that makes it suspect. No matter how nice the bike was cared for the valve clearances would be off by now. That pretty much goes same for all honda engines.
 

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You live in Canada and you are worried about a motorcycle dealer fleecing you to service a half century old Honda?
Don't worry, if you found somebody willing to service it I guarantee they will fleece you.
 

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Hi. Welcome onboard.

Could be a fuse (and I also remember them being behind the side cover), could be a dead Regulator/Rectifier that allowed the bike to run off the battery until it went flat, could be a lose battery terminal cable, could be a dead cell in the battery....could be a lot of things, start with the simplest and work through and eliminate each.

If the mechanic removed and reinstalled the points, he would have disconnected the battery cables - maybe forgot to tighten them? I'd start with checking the main fuse and battery.
 

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Never heard of any cylinders being "reversed polarity". My guess is that the guy didn't know what he was doing, and couldn't get it to run with the electronic setup. Hope they didn't charge you too much for that.
Did performance diminish, and slowly die? Or did it just stop running suddenly. Does it still crank? Battery is still charged? I would go over the previous work with a fine eye to make sure they didn't screw it up. Like left a screw for the points, or as mentioned, a battery terminal loose. And of course, check all fuses for continuity. Check all plug connectors for corrosion and connection.
 

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CB350F has 180 degree crank offset between cylinders 1&4 compared to cylinders 2&3
they have 2 coils and the 2 sets of points run off the crankshaft with a firing order of 1-3-4-2 so it has a wasted spark.

The only way you could mess that up is to connect the wrong coil to the wrong plug.

  • Battery fully charged <- tells us almost nothing at all, what kind of battery, is it stock and when was it full charged, when you started out, or most important after it quit on you?
  • Idle pre-ride was not stable, 1200 - 2000 oscilating, slightest idle screw movement had significant impact <- that sounds like it is running out of fuel. So yes the bike was "tuned" badly if servicing carburetors is called tuning.
Sounds like the bike still has points ignition so it has condensers and those should be replaced if there is any question about the intensity of the spark on the paired cylinders (cylinder 1&4 share one set of points and condenser, cylinder 2&3 run of the other set, so compare the spark between each set to determine if only half your ignition system is running great)
 

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The bike runs a battery and coil ignition system, she won't run without a good battery and the battery will die if it is running on dead loss without being charged, so you should be checking the alternator and charging system.
 
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