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Spin, no start!

Discussion in 'XJ Technical Chat' started by feelergaugephil, Apr 4, 2010.

  1. feelergaugephil

    feelergaugephil New Member

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    1981 Yamaha Maxim 550 (or if your in UK, XJ550)
    It got dropped off at my house to be fixed, Non runner.
    4600 original miles, and original, a superclean under the dust!
    So, I charged the battery up and put some fresh fuel in it and it cranked right up!!
    I let in run for 20 mins with a rev now and again (fan placed in front of engine to keep it cooler)
    So, now for a test drive on this classic bike!
    I backed it out the shed (still running) once backed up, I sat on it, revved it again, back to idle, put it in gear and it instantly cut off!!!!
    I tried the starter but it spun but no start!!

    Figuring that it's been in a shed for 25 years!!!!!!!! the carbs were stopped up!
    I stripped down the carbs and the float bowls were the worst I have seen in years, it looked like old jello!!!
    Once fully stripped, I cleaned out the jets and all passage ways with compressor,now, its all clean, put back together again....
    Cleaned out the tank, and even the fuel petcock filter was clean....

    Put carbs back on, SAME THING! spin no start!!!!
    So I whipped out the ORIGINAL champion spark plugs and they spark on spin!
    So, I get some easy start and spray some in the air box, still Spin no start!!! WTF!

    (Oh, the side stand switch was fully OUT before anyone thinks its that)

    So, I have spark, and I know I'm getting fuel!
    The vacuum hose is working correctly, it does pump fuel when spun over.
    Anyone have any ideas?
    Could it be the original spark plugs gave out? I could understand one or two! but not all 4!
    Like I said, they do spark,,,,,
    Please help! I'm actually thinking of buying this bike if the guy doesnt want it!
    Phil.
    __________________
    GS1000G 1981 (Sold)
     
    feelergaugephil, Apr 4, 2010
    #1
  2. feetballhabob

    feetballhabob Member

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    just because the side stand switch is out does not mean it is always working. Mine would act up for no reason ,but it would start some and quit later and some times would not start.try disconnecting or jumping the switch to see if that is the problem I finely just cut the wire to mine and no more problems.
     
    feetballhabob, Apr 4, 2010
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  3. feelergaugephil

    feelergaugephil New Member

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    Where is the actual connector switch? so I can unplug it and try that.
     
    feelergaugephil, Apr 4, 2010
    #3
  4. KrS14

    KrS14 Active Member

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    Can you not just pull the relay and disable the safety system all together? (Side stand, clutch etc)
     
    KrS14, Apr 5, 2010
    #4
  5. feelergaugephil

    feelergaugephil New Member

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    Hehe! FIXED!!!!!
    4 new spark plugs and cranked right up!! woo hoo!!!
    Clutch slips a bit after 50 MPJH, but will run it some more to see if they free up, if not will need new plates..........
    THX again guys, now the hard part, convince him to sell it to me!!!!
    ps, I always wanted a XJ550, I had the GS550 from 18-22 years old and put on over 80K!!!!
     
    feelergaugephil, Apr 5, 2010
    #5

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