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Investigating blown head gasket and leak at head bolt between center exhaust ports

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    Investigating blown head gasket and leak at head bolt between center exhaust ports

    82 GS750 T
    I'm relatively new to wrenching but managed to resuscitate this bike after the previous owner had let it sit for 6 years outside. Rode through the season in between various maintenance and repairs.
    I had noticed some oily residue around the spark plugs but didn't pursue it as she still seemed to be running fine. After installing rebuilt starter motor recently I start the bike up and let it warm up while I get suited up for a chilly fall ride. When I come out there's exhaust coming from top end of the engine and upon further inspection I notice oil coming from the head bolt between the center exhaust ports.

    With snow on the ground here now I figure my winter project has found me. Before I pull the engine and dig in I figure it might be a good idea to get some advice from someone who knows more than me about what might be the cause of these specific symptoms. The last thing I want is to replace the head gasket and whatever else and quickly (or not so quickly) find that I haven't fixed the root problem.

    While I'm in there what should I be looking for? What are things I should replace since I'm already digging around in the top end? I've been reading through the Clymer and various top end rebuild info on the interwebs but being a newbie who's never pulled apart an engine before it's a little difficult to parse out what's really necessary in my situation.

    Any advice is much appreciated - thanks!

    #2
    Start by replacing these two O-rings that are one of the biggest know causes for that leak. Number 17 here: http://www.partsoutlaw.com/oemparts/.../cylinder-head

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      #3
      Thanks! Got em on order.

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