My ZR8 hangs up at 3000 when I come to a stop. It will stay there unless I blip the choke. Then it will idle at 2400. If I blip the choke again it will idle at 1500. Go to the Amsnow forums. This has been discussed in the past. People have given responses to the best carb adjustments to prevent this from happening. Other than this idle problem, the sled runs great so I decided not to mess with the carbs and just rode it like it was. Good luck.
My '02 ZR8 had the same high idle issue.
I found the air screws at 1.5 turns open from the factory. The spec. in the service manual is 2 turns open for the airscrews and 1.5 turns open for the fuel screws. For the 800 twin try this spec and then make minute adjustments from there if necessary. FYI, the air screws effect idle mixture. The fuel screws come in to play when the throttle is opened just off idle to about 1/4 throttle position.
P.S. it was GLS who suggested I open the airscrews as a reduced A/S setting wouldn't allow the carbs enough venturi action to pull adequate fuel throught the idle circuit resulting in a high (lean) idle condition.
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