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Jan, Check the attached links,Manuals and guides, Good luck with your Bike
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www.rzrforums.net > ... > Technical > Engine and Drivetrain Jul 22, 2010 - This is a discussion on Cant accelerate over 20mph within the ... The oil is not a problem, what RPM is the engine turning? and are you 100% sure your in high gear? ... DeeZee 35X14X12 Cargo Box, Super ATV Steering Wheel And EPI Severe Duty Belt .... why wont my 2015 polaris ranger go over 20 mph.
If you are lucky, you might just need new fuel filter and the fuel bowl cleaned out, and maybe new air filter. If not so lucky you need carburetor rebuilt. Backfire is usaully caused by engine running too lean ( too much air for the amount of fuel present). Fuel bowls get gunk in them and the fuel needles and fuel jets get varnished up. The accelerator pump gets worn out gaskets and/or bellows and doesn't give the right amount of fuel mist when you accelerate.
Full Choke is indicative of a motor starved for fuel
Sounds like you need a valve adjustment, if it is popping thru the carb, the intake valve is open at the wrong time, this can be caused by three things, too much gas, timing is wrong (stretched chain) or valves too tight not allowing valve to close. I would adjust valves first.
This sounds an awful lot like a safety switch issue. A lot of ATV's now have safety switches which need to be deactivated otherwise the safety switch sends a signal to the ECU telling it to impede or delay the timing. So on your model I believe you have to pull the clutch in before you attempt to start it. AND you have an emergency brake safety switch. The emergency break safety switch can be activated if the emergency brake lever has been removed or if the pivot point is heavily worn, or if the rigging is wrong. All of these things will cause the lever to contact the switch improperly. And so your ATV thinks the emergency break is on. Basically your ATV thinks you're crazy for trying to accelerate while the break is on so it impedes or delays the timing so you wont hurt the ATV or yourself. And that's why your getting a nice idle but backfiring and sputtering when you try to accelerate.
Hope this helps. Good Luck
john deere trail buck 2005 650 when accelerating before it gets to top starts cutting out pretty bad. In the high altitude it was doing that and not it does it here in MO. What causes this a weak fuel pump? Thank