hI, I I'm running a 1990 40HP johnson Model # TJ40ELESF If the timing is incorrect will that limit my WOT RPMs. i cant seem to get the motor above 4700rpms i was running a 15 pitch, then switch to a 13pitch same RPM, but the 13 was cupped (could that be why the rpms stayed the same?) the motor is mounted on a cmc t/t which gives it a 5in setback and its a tin BassTracker Pro 17 doing 30mph with the wind behind me, (the spec show 4700-5500) thats not close at all. Thanks