I noticed on my Tracker that the throttle does not seem to be responsive. I move it forward about two inches before the engine starts to power up. How do you tighten the linkage cable? I have a 50hp Evenrude. Both cables in the back seem to have a very large loop before entering the engine housing. I think i might be unable to reach full throttle because of this. I also have a 21 pitch prop that doesnt help either.