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iv got a 77 gs 750 and i want to put a gs 850 top end on it. iv bin told this is a bolt on but im not sure. what kind of power increase are we talkin? can i use the 850s cylinders and pistons? iv got a buddy with a built up kz 650 and i want to stomp him!
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The 850 cylinder block will not fit into the 750 cases without cutting the cases a little bit for clearance. Try the wiseco 850 kit. There's enough material in the 750 cylinders for the 4mm overbore.
Terry -
That's contrary to what I've been told - that is, it's a straight swap. No machining of the crankcases required.Originally posted by humheadComment
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I beg to differ!
I'm looking the top half of a 750 crankcase with an 850 cylinder block lowered down on the cylinder studs as far as it will go. There's a 3/8 inch gap between the bottom of the cylinders & the top of the case. Turning over the top case half reveals at least four spots where the 850 cylinder block sleeve is making contact with the case.
I wish it was possible without some machining. The evidence on the floor of my workshop says otherwise.
If the person who told you it can be done has instructions & pics I'd love to see them. That would mean I'm not out $$ spent on something I can't use.
The Wiseco 850 kit remains an excellent option. No extra parts necessary.
TerryComment
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I have heard the 850 cylinders are longer ??? that may be what the hangup isComment
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Re: I beg to differ!
Me too..... I have a complete 850 top end waiting to go on my 750. I'll not be happy if I have to start grinding things!Originally posted by humhead
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Hmmmm......I'll have to break out the ol' camera and compare blocks.have heard the 850 cylinders are longer ??? that may be what the hangup is
I feel your pain......While the camera is out, I'll see if I can get clear pics of what I'm talking about.I'll not be happy if I have to start grinding things!
TerryComment
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