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I replaced the starter on 500 Polaris sportsman, it will start right up and next time I try to start it everything is locked up. I checked battery and connections everything is good. Could it be the compression relief valve? How would you check that?
 

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I hope this helps

Automatic Compression
Relea se Mechanism Testing
Theautomaticcompressionreleasernechanism located
within the center of the camshaft can be inspected
without removing the camshaft from the
engine. ®
1. Twist therelease mechanism inside the camshaft
and observe the smoothness of operation. There
should be no roughness and the spring should return
the weight again st the stop pin.
2. The actu ator ball (F igure 51) must be held outward
when the release mechanism is in the compression
release position.
3. Withdraw the release mechanism (Figure 52)
from Ihe camsha ft. Inspect the shaft and spring lo r
wear or damage.
4. Inspect the lobe at the end of the release lever
shaft and the actuator ball for wear or damage. The
actuator ball is not avai lable separate ly from the
camshaft.
 

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Your exhaust rocker has a groove and is not releasing compression. Ebay sells a replacement rocker for $60. Pull the valve cover remove four bots holding rocker arms down then inspect center rocker.
 
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