My snowmobile is lacking power?

NOWHEELIES:t

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Its a 2000 Arctic Cat ZR600 EFI (Electronic Fuel Injection). I cant seem to get the engine above 6000 RPM. Compression tested at 110 PSI on both cylinders, I have spark on both cylinders and brand new sparkplugs, I know that both injectors are firing because I can run the engine on just one cylinder both on the left and the right side. I need some help. Does anyone have any ideas?
The compression is in specs according to arctic cat.
I cant get it above 6000 RPM even with the track in the air.
 
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