Question about 1982 Yamaha XZ 550

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'79 CB 750 won't start back up after running for a while

I drive about 25 miles to work on my '79 Honda CB 750. Over the past 2 weeks, when I have stopped before getting home -at the grocery store & getting gas another time - the bike will not start up again. It seems as though there is a weak charge. After attempting to start it about 3 times - by the 3rd time there is barely any juice revving the engine. By the 4th attempt - if I tried, it would just click over w/o any revving up.

When this happened last week, I let the bike sit for ~4 hours & when I tried again it started right up. I gave the bike about an hour today & tried to restart it (it died at the gas station up the road from my house). It did not work, so I'm giving it a bit more time.

As a side note, I just had all the carbs rebuilt by a reputable shop in my neighborhood. The mechanic there said that the battery showed that it was holding a charge & he really didn't have any ideas.

Any suggestions would be greatly appreciated!
chris

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  • A Miller May 11, 2010

    I seem to remember something about the early Honda 750 ... something about the distance between the engine and the carb - too long or too short and the engine heat did something to the carbs as a result. It ran one way when cold and very different when hot. Of course yours is not a Honda but a Yamaha. How is the compression? Valves good and properly adjusted? What about the time chain? Properly adjusted? I dont know the answer to your question but I wish you well. Please let me know when you resolve this. a

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I would take the bike and or the battery to Sears or any large auto parts store and let them test the condition of the battery and the chargeing system.They will do it for free.Bike batterys seem to only last 2 or 3 years.

Posted on Oct 02, 2009

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