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I've got a stock 01 zr 800 and my brother has a stock 02 zr 800 cc.Mine has a 1 inch track with 192 studs and he's got the 1.25 with 144 studs.I can get him out of the hole but then he passes me about 60 feet out,are his weights and secondary spring enough to be getting me on top or are there more differances between the two sleds.
 

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The two 800's are completely different. Besides clutching set up the 02 has a new bottom end and I think it has a different stroke(not completely sure on that one) If you look at the dyno reports in am smowmobiler it shows that they have different power and torque curves. To start with you have to get more wieght in the primary and try the orange/ yellow primary spring. leave you secondary spring alone cause its a good one(softer and will shift faster).
 

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there aren't any difference between the 01 and 02 800 twin engines.  One minor difference is that the 02's have stronger pistons than the 01's otherwise the the engines are identical still a 76mm stroke and still the same bore of course.  there are probably minor differences in clutching and jetting but i wouldn't even know about that for sure
 
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