Its extremely difficult to see the marks on the 300s even with a mirror. They were prone to being to lean on the oil and some died a slow death. Polaris warranteed alot of engines back then. There is a procedure using measurements for setting it up but its not as good as seeing the marks. Taking the airbox off and moving the carb to one side might make it more visible but the tranny is in the way. Newer models have a stop so the oil pump arm just needs the slack tacken out of the cable when the throttle slide is at idle.
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