Need some help on how to check out tilt and trim, did not use motor for two years and when I finally went to use it the tilt was stuck, was able to get it loosened up and actually use it but will go up at times and down at times but is not acting reliable, am wondering if air could be in system and if so how to bleed it. What is the proper way to check the oil level for it? Will it get better with more use? Any thoughts are welcomed. Thanks.