You can find the dipstick for the transmission on a Polaris sportsman 500 HO 2005 near the back of the transmission on the engine in a tight area.
behind the left front tire
For the older 400/500 engines you will find the dipstick sticking out of the top of the remote oil reservoir in the front left wheel well.
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there is no dipstick - use the computer
The top speed of the polaris 500 H.O. is 60 to 62 mph
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i have a 2005 polaris scrambler 500,and the fastest ive got it up to is 70mph