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What's involved with increasing displacement on an 8 valve GS750 motor?
I've been plotting and scheming some off season maintenance for my '79 GS750E (carbs, valve adj), and got to day dreaming about what it'd take to make the 750 motor an 850 or 1000. I've read that the GS1000 motor can be squeezed into a GS750 frame, but what would be involved with changing over to larger pistons and cylinders? Any comments, links to tutorials, etc., would be appreciated.
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'79 GS750 - 4th and current ride...first since 1983
'73 CB350 - 1st ride
'76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
'79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a house -
You can install cylinders and pistons from an 850 to have an 843cc engine.
Everything is pretty much "plug and play".
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
Family Portrait
Siblings and Spouses
Mom's first ride
Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
(Click on my username in the upper-left corner for e-mail info.) -
Great info....thanks! Naive question - Would the 850 block need to be from a '77-'79 or will most GS850 cylinder blocks work with my 750 heads?Last edited by knotscott; 10-01-2014, 06:42 PM.'79 GS750 - 4th and current ride...first since 1983
'73 CB350 - 1st ride
'76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
'79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a houseComment
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The 850 started in '79 and went through '83, in the US of A.
I have heard that the '79 blocks work best, not sure what the differences are,
but the part number for the '79 block is the same as the '80 and '81, so they should work just as well.
.sigpic
mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
Family Portrait
Siblings and Spouses
Mom's first ride
Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
(Click on my username in the upper-left corner for e-mail info.)Comment
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Thanks Steve.'79 GS750 - 4th and current ride...first since 1983
'73 CB350 - 1st ride
'76 GT750 - 2nd ride - the "water buffalo" - sold to buy an engagement ring
'79 RD400F Daytona Special - 3rd ride, the last of the street legal US 2-strokes - sold to buy a houseComment
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An 8V GS1000 engine bolts right into a 750 frame. Fastest way to HP and the 750 frame is a tich lighter so I've heard as well.Rob
1983 1100ES, 98' ST1100, 02' DR-Z400E and a few other 'bits and pieces'
Are you on the GSR Google Earth Map yet? http://www.thegsresources.com/_forum...d.php?t=170533Comment
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