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Discussion Starter #1
I have three 92 RR and one has a blown motor that I'm looking to retromod.
What engine can I got into the frame. Would a blackbird motor fit?
 

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The simple answer is no, it wont.

The difficult answer is yes.

There is a guy here who has put an XX motor in his 900RR however it took some extreme modifications.

There is also a person here who has put an RR4 (2004 1000RR motor) in their 900RR frame, again, with substantial modification.
 

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Nothing really. The issue comes with the cross member that holds the coils. It gets in the way of the fuel rail and air-box of the newer, larger engines. The engine mounts also need significant re-working and in come cases require removal and adding of frame material.

The 929 and 954 motors can go in, with less work, but the pivot-less frame design of the engine cases can make it difficult too.

I would say you are just better off going with a rebuilt 900RR engine, unless you want to rise to the challenge.
 
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