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And all of a sudden....


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  • Member Contributer

So before I pull the carbs off, here's what happened:

Rode to work (15 miles) ran perfect-like it has for a couple of years. Fire it up to go home, idles perfect for a couple of minutes while I put my helmet on and one cylinder goes dead. Hmmm. Before, in the past, this usually means time to pull the carbs. Got to get home so off I go. Still running on 3 cylinders-right up to when it totally stops running-no matter how much throttle. Pull over and assess: Battery voltage 12.8 when I started it,  14.8 at speed. Temp, barely moved the needle. Half a tank of fuel (non-ethanol). So I wait 15 minutes, try to start it, fires at barely a touch of the button and runs perfect. Hop on an go about 3 minutes, then down one cylinder, about another 5 minutes-same thing, just dies, won't run any more. Wait 15, starts right up, runs great, then the 3 cylinder power loss for a few and then dies as I turn the corner and coast to a stop at the bottom of my driveway. So far fuel pump is good, float bowls have fuel, did the fuel pump cut-off bypass, still does the same thing. Could it be the carbs? My intuition is that it's electrical-pulse generator? Like I said-starts and runs perfect for 3-4 minutes, the loses a cylinder, will run on 3 for a bit and then just won't run any more. The rear two cylinders are cooler than the front two when it stops running. (coils?)

 

Thanks in advance for any input. 

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bad pulser coil will kill 2 cylinders.  bad ign coil will kill one.  bad cdi can do anything.

 

inspect all  plug colors, especially the one on the cool cylinder.

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  • Member Contributer

Thanks Squirrelman. I assume by pulser coil you mean the pulse generator. Time to get out the multimeter, when it does run on all 4 it runs, idles, sounds perfect.

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  • 4 weeks later...
  • Member Contributer

UPDATE: Well, it turns out the problem was an intermittently bad fuel pump. When asked what I wanted for Fathers Day I said some time to diagnose my bike problem. After checking all the electrics 3 times it turned out the fuel pump would work for a while, sometimes. Bypassed the pump completely, been riding it for over a week, while waiting for a new pump to arrive. 

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