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90 cylinder swap on a 60?

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wardie:
If I purchased cylinder, base gasket, piston and rings plus head is it an easy swap to fit onto a 60 motor?

Looking to upgrade thought if I could swap a 90 top end that would the  easiest. Anyone can share factual info on this swap?

mqtsteve:
Hey wardie,
I'm not sure, but I think the 60 and 90 have different cylinder stud patterns.  The 90 cylinder is bigger and has different studs.  Cylinder stud (p/n 2121-5000) and head stud (p/n 1126-5000).  I don't think it would be an easy swap?  Some other members may have a concrete answer?  Good luck! Steve

slawsonb:
No experience here, but just  makes me wonder how the big end and crank bearings would stand up to the additional displacement (force)...If its even possible. ???
...bert

disc_valve:
Sorry, Wardie, that swap is not on. The 60 Sport is a bored-out 50Sport, and the 50 Sport engine castings are all around 20% smaller in dimension that the 90 motor. The 90 cylinder spigot is too big to fit the  hole in the 60 crankcase, and the 90 Sport gudgeon pin is too large to fir in the 60 con rod.

Graham

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