1990 Yamaha XT 600 E Logo

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Anonymous Posted on Jun 11, 2011

I HAVE JUST BOUGHT A '92 MODEL XT600 AND i WANT TO PUT THE BIGGEST "BIG BORE KIT " IN IT WHAT SIZE CAN IT TAKE? AND WHERE CAN i PURCHASE ONE FOR BEST PRICE?

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  • Posted on Jun 11, 2011
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Stock bore is 95 mm, Wiseco offers a 101 mm piston, some crankcase cleanup is required. Will be 672 cc monster when you're done. Actually am building one right now for a supermoto screamer. Good luck!

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The company that does the rebore will take care of all that. They are the experts, leave it to them. They will take it, measure it, bore it, hone it, supply the piston and rings

Another alternative is that they can bore it out and insert a sleeve and put you back to the stock size.

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Max size of cylinder

The biggest bore would be 1mm over.The standard bore on that bike is 65.0mm
so you could bore up to 66mm and to be a 900cc you would need a bore size of 68.5 mm
So your answers
  1. Yes, it can be bored
  2. No,Not to a 900cc
  3. Piston size is 66mm (making it roughly an 843cc)
I Hope this has answered all your questions,But please feel free to ask any more if needed.

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