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.
Got delivery this morning, not an absolute gem , but as far as I concerned a cracker , get rid of those plastics (previous owner hit a pheasant), runs sweet as a nut , but will get to grips with the rest:D
So I picked up a 1997 Blade with 48k miles that has had a pretty hard life, looks like it’s been used for commuting year round but it runs and rides great so hopefully no gearbox/engine problems. I will use this thread to document my progress and post as many Pics as I can, everyone loves...
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