Hoping someone can help me with compression here. I just acquired a YL1 that had been sitting for over 20 years. Rebuilt carbs, replaced battery, replaced petcock, sealed tank, replaced plugs and changed all fluids. Started right up after 2-3 kicks and after adjusting idle and air screws it seems to idle ok. I am able to put it gear but it just has no pick-up when trying to take off. If I pull hard on the throttle while in 1st gear it seems to not bog so much. I tested compression of both sides with plugs out, throttle open and engine warm on a cheap compression tester. Got 60 compression of both sides. Next I put some oil into the spark plug openings and tested and now I got 120 on left and 90 on right. This seems off since on the first test they were both 60. Is it possible that this tester is inaccurate or am I doing something incorrectly? This is my first time testing compression on a bike. hoping I don't have to replace rings but am prepared to do so if need be. Thanks in advance. I know this isn't a Honda but I do have 3 other vintage Hondas and am having a hard time finding a forum as good as this one that is as active for Yamahas.