I just put new throttle and shift cables on my boat and when you have the throttle (quicksilver) at WOT just the vibration makes it come back up. What kind of adjustment is there to tighten up the throttle. I have an 87' 50hp 4cyl with quicksilver throttle and quicksilver cables. Also if you push throttle all the way down the motor will bog down a little, if you back off just a bit it runs great?