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Check online for the manual. You can usually find a copy for free. Search for a pdf copy. I have a manual for the 250 and the 400. You may find a member here that can give you the 300 manual.
For compression test remove both spark plugs, put a battery charger on the battery and unplug your fuel injectors. Screw the adapter into one cylinder and turn it over with the starter for about 5-10 seconds. The goal is to turn it o er until you see the gauge stop increasing pressure. Write the number down, then repeat for the other cylinder.
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