Just picked up a 371 for $250 , the previous owner told me that the engine is no good. I checked the oil ( which is full) and it spins free. Would like to check for spark and make sure its getting fuel. Which is the best way to check for spark? Also where's the best place to get a service manual. Figured it's a small investment for a chance at hydraulic power so I'm gonna see if I can get her going..thanks