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'81 GS650G: Aftermarket oversize pistons hit head

  • Thread starter Thread starter Guest
  • Start date Start date
Those pistons def look like the gs750 2 valve pistons. Back in my day i took my 550 and punched it out to a 650 like everyone does. But then I took the 750 pistons and bored out the cylinder and installed a cylinder spacer to drop the pistons in the bore in order for them to clear the valves. It worked but the combination of everything didn't really provide the power delivery i was hoping for. Plus the motor ran HOT.

I would recommend NOT using those pistons.
 
Hey everyone,

Just wanted to let you guys know - with great help from Chuck I was able to "finish" the engine. He was very kind to send me over a set of the Wiseco pistons and after some more machining on my side I was finally able to put the engine together this weekend. Have to take photos and show them to you guys.

But I'm a very happy guy now. I can 'easily/freely' rotate the crankshaft and everything looks/feels smooth. Time to get the rest going on this never ending project.... I originally wanted to ride this summer. But looks more like I will be done on time for christmas haha
 
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