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How far down the rabbit hole will I go... `78 GS750

  • Thread starter Thread starter bottobot
  • Start date Start date
Did you test the head for leaks? Pour some acetone into the intakes and wait a bit. Then see if any seeped past the valves.
 
Well how did this project end up?
I may open up my engine by spring and see what "the p.o. bored the motor out" meant by the guy I got it from. May have a Wiseco 844 kit (it's really fast, kept up quite well with an 1132cc KZ1000 on a Hocking Hills State Forest MC trip a few weeks ago).
I lucked out and contacted MTC Engineering to find that they had ONE KIT LEFT hiding in their warehouse of the old GS750/850 big bore kits, so I have some 850 jugs @ 69mm that need to go to a worthy machine shop to be bored for these 72mm pistons! Had them machine them down so I can run 87 Octane in the summer heat, they said just under 10:1 after shaving .040" off the tops from 10.5:1 previously.

Had you gotten a head gasket from Cometic? I had completely forgotten that I would possibly need a custom head gasket when running 850 cylinders with +3mm oversized pistons. You may have been able to do a stock 850 gasket if it fits the 750 cylinder block fine.
 
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