I have a 99 Sportsman 335. It idles wonderful but won't rev up past idle. Been screwing with for about 3 months. Took it to a "mechanic" and they gave up. I have replaced...
Carburator
Rubber intake manifold
Fuel "pump"
Fuel lines
Fuel petcock
Air cleaner
Flywheel
Stator
Trigger Coil
CDI module
Coil
Coil wire
Plug
I checked the timing. Checked cam lobes. Checked intake for air leak. I have 2 other Polaris ATVs that I maintain just fine. Feel stupid and very frustrated. Polaris won't work on it. They say the bill will be more than the machine is worth. I offered a deposit they still said no. Was running great then went bad just like that. Really a nice machine when it runs. Getting ready to melt this thing with a flame thrower.