Question about Yamaha XJ 650 Motorcycles

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My 1982 xj 550 was starting to sputter real bad under hot conditions, and did this periodically for a couple months, now it will start cold and run, but when i drive it it will sputter hard and die within blocks. I believe I have a coil problem, but dont have a clue what resistance the coils are to buy aftermarket, and i am not wanting to pay $400 for factory coils. any idea, may be worth mentioning that acouple of years ago the previous owner told me he took some sort of resistors out of the spark plug leads? I have no idea as i never saw them

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  • scott mckee Sep 17, 2010

    Thanks, I will do that, unfortunately the resistance value given to me by the after market makers is either 3.0 or 5.0ohm and they cant tell me what my bike needs. I ordered a clymer manual for my bike today so I hope that tells me as well. I just dont want to fry out the rest of my ignition system putting in the wrong stuff.

  • scott mckee Sep 17, 2010

    Thanks that is the confirmation I needed



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Paying $400 for a coil is absolutely ridiculous unles you want to do a concourse restoration. You can buy a complete high output ignition set with CDI unit for $250!
Coil input should be in the region of 2.5ohm and output in the region of 11k ohm with connectors removed. The "resistors" that were removed are in the plug connector and helps with cancelling radio interference and limiting current draw through the secondary windings of the coil. High current draw = high wattage = heat = failed coil. Put them back, they're not that expensive. Something like $3.

Posted on Sep 16, 2010


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