Here is what I have:
2009 Teryx Sport

Here's my problem:
At approximately 6 to 7 thousand Rpms... I loose power, start backfiring, bog down and the motor misses.

Here's what I've done to fix:
Fuel pump pressure check, valve adjustment, and replaced the spark plugs.

Here's what I'm doing tomorrow: cleaning air filter (air filter was really clean already), and disconnecting ecu and checking electrical connections... Plug into ecu and see how it responds...

Does anyone have any further recommendations?

Thanks!

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

Sounds like the OD cap.... Nah just kidding but good luck. I'm curious to see what you find.

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2010 Teryx, Muzzy Pro's, MSD, UniFilter, VFJ Stage 3 Clutch (professionally setup by Bigdaddy3)

I think you have a bad Wiffle Waffle.

Fuel pump or injectors.

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2008 Teryx, Custom Creations Long Travel suspension, Cage w/doors and Exhaust, Dasa intake, Weller impellar, Dynatek CDI and Coils, K2 (Sandjunkie) Aluminum Bed, PRP seats, SDR lowered seat bases, HIDs in headlights and up top. ITP ss212s with Bighorns.

Definitely the wiffle waffle.... Or maybe the chingy bohingy dingy wingy... Ill check those after I pound the sixer tomorrow for lunch...

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

Josh, did you ever switch gas tanks with your brother or dad? How did TYG check the fuel pressure?

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2009 Kawasaki Teryx Sport Long Travel Industries +5" suspension, FU2Chassis 4 seat cage, Induced Fab doors, (4) 26x9 DWT Moapas, DASA exhaust w/quiet cores, DASA impeller, DASA OD clutch plate, DASA KEBC block off plate, MSD, bored out throttle bodies, FuelUTV Siphon break, LTI UNI air filter, lime green secondary spring, TripleX rear bench, KBrown Customs oem replacement HIDs, 4" HIDs on the A pillar, Fiber Skinz diff skids, UTV Inc. Temp gauge kit, UTV Inc. fan bypass.
Safety is no accident

I'm gonna switch tanks with my dad tomorrow... And I checked my fuel pressure by unplugging the fuel hose before the throttle bodies and putting a fuel pressure gauge in the hose... Then turned on the fuel pump to see how much pressure was built up... It came up to 40psi... I just don't think I'm getting enough fuel at higher Rpms... I wonder if there is a way to measure the flow throughout all rpm ranges...

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

If it turns out to be the whiffle waffle let me know I may have an extra one I will sell you cheap!

Take it to Chris at Benchmark.

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Benchmark Performance

Check the muffler bearing and your piston return springs...

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Stock 2012 Blue LE Teryx 4.... for now!

Oh... He's on the list... Just gotta do a few more checks before I make "the desperate call for help"....

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

Will do!

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

I did... Moving onto the blinker fluid now...

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

Judging by all these great responses, I've come to one conclusion... I guess I dish out a lot of sh!t around here... Ha ha!

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09 Sport, Muzzy Pros, MSD, Dasa Intake, Dasa Impeller, Dasa OD Clutch Cap, Dasa Guage Pod, Black Rhino Guages, Painless Fuse Block, K2 Concepts Carbon Fiber, K2 Concepts Bed Delete, Four seat cage, Crow 5 Points, Neri Style Rear Seat, PRP Front Seats, Induced Fabrication doors, Billet King Steering Rack, Billet King Master Cylinder Guard, HID Conversion Kit, Baja Designs 6"Pre Runner HID's, HCR +6LT Kit, Fox 2.0 Shocks, G-Force Trilobite Tires, Scat Track tires, Sand Star Tires, Douglas Diablo Wheels, Full Fiber Skinz Skid Plates and way too much money!

I would lean on fuel if your mapping was good before and you have not changed it.