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fix up or part out?

Discussion in 'XJ Technical Chat' started by marianadeeps, Feb 19, 2010.

  1. marianadeeps

    marianadeeps Member

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    Since my $80 XJ650G bike is now on the road, I acquired yet another XJ650H for parts. Another completely neglected, rain saturated bike that looked like the PO tried to bob and never completed -- just stripped a bunch of stuff off.

    I tested compression (odometer says 78K yikes) 1 = 102, 2 = 100, 3 = 25 and 4 = 100. Should I stop at this point and part? Or could it just be a valve too tight on 3? If the engine was good, this one would probably cost about $600 - $700 in parts to make decent again. Is it worth it?

    Here's the weird thing -- as I was testing spark on 2, I got the coil buzzing problem after I turned of the start swtich. Deja vu all over again. The same issue I had with the other fixer XJ 650. The TCI channel was fibrilating sparks through the coil after the starter was off. When I brought this up at the forum no one had ever heard of it, but now I have it same thing, same cylinders as before on a second bike! What are the odds? Maybe that's the tell-tale sign a TCI channel is blown. Anyway if anyone else encounters this, you'll know what it is.
     
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Honestly? 78K miles, #3 has issues... If you REALLY want to rescue it, check the valve clearances and see if #3 is tight. If it is, re-shim it and run another compression test. Engine rebuilds aren't fiscally responsible; and if this bike has never had its primary chain tensioner replaced it's doomed. On top of that, those are kinda low numbers anyway.

    What I'm saying I guess is that there's very little true hope that "the engine is good." Sounds like it's a bit too late for that mill.
     
  3. Hillsy

    Hillsy Member

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    Hmmm - sounds like the motor is a bit sad.

    Do you have all the parts? If so, I'd slap it back together and sell it as a complete "non runner". Sounds like it doesn't owe you much anyways.
     

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