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Pick up coil for '80 XJ650??

Discussion in 'XJ Technical Chat' started by wanktakeit, Apr 30, 2018.

  1. wanktakeit

    wanktakeit New Member

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    Yes they are
     
  2. SQLGuy

    SQLGuy Well-Known Member

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    1 and 4 are on one coil, and 2 and 3 are on the other. So pickups and the TCI module are definitely not part of the problem here. Most likely carburetors. Should check compression and valve clearance, though, since that's easy to check, and if you have a compression problem you'll need to fix that before doing anything on the carbs.
     
  3. wanktakeit

    wanktakeit New Member

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    Has new piston rings and associated gaskets last year.....
     
  4. SQLGuy

    SQLGuy Well-Known Member

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    That makes carbs sound even more likely, since it's very likely that compression would have been checked and valves adjusted while everything was apart to do rings...
     
  5. wanktakeit

    wanktakeit New Member

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    Good news!! The bike lives and runs like a bat outta h*ll!!!! Better than it did last year! I think it might have been a combination of the carbs and grounding issues. But oh well. Thanks for all the input!
     
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Others will be reading this thread in the future. What was the solution to your problem?
     
  7. wanktakeit

    wanktakeit New Member

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    I honestly don't know. Like I said, I think it was a combination of the carbs and grounding issues.
     
  8. XJ550H

    XJ550H Well-Known Member Premium Member

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    so did you clean up any grounds?
     
  9. wanktakeit

    wanktakeit New Member

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    I replaced the frame to motor ground and added another ground from battery to frame. And cleaned all the connections for the ignitor and alternator.
     
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  10. wanktakeit

    wanktakeit New Member

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    So now a year later, I had an idea and ran with it. I used coils off a GM 3.8L engine. The bike starts, runs, idles and has WAY more power than it ever did. So the new coils I had bought last year apparently have an internal issue. And I did open the carbs back up, and I did find the top of the diaphragm on #4 did move and made a huge vacuum leak. So thank you to all for your help and I deal. Pics are of my mods IMG_20190602_164516167.jpg IMG_20190602_164516167.jpg
     

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  11. Chitwood

    Chitwood Well-Known Member

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    You dont want to get bit by those coils! They are capable of producing up to 80k volts! Theres also a ton of them around new and used. Would have never thought to use those coils.
     
  12. wanktakeit

    wanktakeit New Member

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    Chitwood, I'm thinking I'm gonna sell the bike and get the XS650, cuz there's a ton of aftermarket parts for that bike.....this is only to get it running, and try and ride for the season.
     
  13. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The SX650 is slower and less comfortable. But there are a lot more aftermarket parts for them.
     
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  14. Chitwood

    Chitwood Well-Known Member

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    Yes there's more aftermarket/will fit whatever you want to manufacture parts out there for an XS, and they're chain drive. Well the 650's anyway. I have buddy's who have xs650's and they dont have near the power, acceleration, or smooth running that I do on my xj. Yea mine doesnt look like theirs (chopped, raked, stretched, etc) but I have no problem staying in front of them. Food for thought.
     
  15. wanktakeit

    wanktakeit New Member

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    The XS400 is chain drive also, once you get into the 750 and 850 triple, that's where you see shaft drive. I would know, I have an old XS750 motor. I was gonna use it to build a go cart around. But there is a big bore kit to make a 650 into a 750 twin.
     

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