If it's jetted for twin pipes and has the stock pipe on, you will need to change out the jets to the stock (usually smaller) ones... Clutching may be off as well, as twin pipes change the RPM where the powerband is.
Good news is, you will get better fuel mileage with the smaller jets..
Bad news is, you may not make it to the moon, but it will be close

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2007 RMK 700 155", 2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650
RIP, destroyed by fire 1-22-2008

04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700
http://www.avalanche.org/accidents.php