Author Topic: CB750 Crankshaft changes through different models  (Read 535 times)

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Offline Rocky2010

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CB750 Crankshaft changes through different models
« on: February 13, 2017, 03:27:15 PM »
Would like to know if there were any variations regarding crankshafts installed in CB750 engines from KO to K6 models. I have a couple of crankshafts they have a couple of different casting marks also one of them has a series of numbers on the front flange not stamped but looks like the dark numbering they put on the conrods.
Cannot find any information regarding this, but I am sure someone will know  :)
« Last Edit: February 14, 2017, 03:47:06 PM by Rocky2010 »
2010 Harley Fatboy Lo
1972 Honda CB750/4 Under Restoration
1971 Honda CB500/4 Original Condition
1972 Honda CB350/4 Original Condition
1972 Honda XL250 Motorsport Under Restoration
1967 Honda C90 Original Condition
1968 Honda S90
1962 Triumph Speed Twin
1952 Triumph Speed Twin
1970 Bultaco Sherpa T
1971 Bultaco Alpina
1958 Moto Guzzi Zigolo
1970 Moto Guzzi Ambassador Original Cond
1973 Yamaha RD250
1948 Velocette x 2
1942 WLA Harley Davidson
2006 Kawasaki ZX12R (Sold)
1980 Corvette

Offline Rocky2010

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Re: CB750 Crankshaft changes through different models
« Reply #1 on: February 16, 2017, 03:50:29 PM »
BUMP

Isn't there anyone who knows if there were any crankshaft changes from the KO - K6 model?  :)
2010 Harley Fatboy Lo
1972 Honda CB750/4 Under Restoration
1971 Honda CB500/4 Original Condition
1972 Honda CB350/4 Original Condition
1972 Honda XL250 Motorsport Under Restoration
1967 Honda C90 Original Condition
1968 Honda S90
1962 Triumph Speed Twin
1952 Triumph Speed Twin
1970 Bultaco Sherpa T
1971 Bultaco Alpina
1958 Moto Guzzi Zigolo
1970 Moto Guzzi Ambassador Original Cond
1973 Yamaha RD250
1948 Velocette x 2
1942 WLA Harley Davidson
2006 Kawasaki ZX12R (Sold)
1980 Corvette

Offline 754

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Re: CB750 Crankshaft changes through different models
« Reply #2 on: February 16, 2017, 04:41:27 PM »
The very first 2** had a smaller alternator bolt. Then there wasca difference in the way the balls were held in , some screwed some staked. The balls seal the drilling holes for the oil passages.
 So basically cranks interchange, as long as its not from the automatic.
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