OK I just finished an eight hour graveyard shift and I think my head is clear so let me take a shot at this.
I have a SP1. I want to put a SP2 swing arm in my SP1. I have not measured anything but just taking a guess here. The SP2 pivot bolt is smaller in diameter then the SP1. This would be the reason for the spacer in the back of the motor. The reason others have done this and it has worked was they had all the SP2 hardware. The SP2 hardware screws into the frame. The SP2 hardware then centers and supports the smaller pivot bolt so the swingarm does not move around. If you do not have the spacer in the back of the motor, the motor could still move around.
That is my understanding for the needed spacer in the back of the motor. I would bet that the collars in the swingarm are also smaller. They may not press against the motor very well without the spacer.
Exactly, you could bolt the swingarm in without the spacer but the engine would not be supported by anything, you must put the spacer in.
In fact you need all the hardware bolt/spacer/collars/ ect the the whole SP2 Kit to do it properly
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SP1, No.1 - 2000 SP1 (SP2 Engine) Scorpion Cans, Yoshimura Link Pipes, R&G Exhaust Hangers, Pazzo Levers, Race Bodywork, De-flappere'd, 520 Chain , Soft Rev Mod, Q-Gears Removed, DT1 Air Filters
SP1, No.2 - 2000 SP1, Power Commander PCIII, Deflappere'd, K&N Air Filters