you can lower the back with your normal ****y ones. I figured it out when i changed my engine. Once the engine is actualy out of the bike the swing arm is free of the weight the you just swviel the top of your suspension up for lower and down for more stiff and high ride. Becareful because if its too low the exhaust will hit the backwheel gaurd lol. You might be able to do it without taking the engine out.
the first two have standard suspension setup
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my lowered setup using same standard suspension at the back
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Note: fronts were dropped a bit aswell because it looked *** when the back was just lowered