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I was reading specs of my 1978 70hp and notice the 75HP has the same bore and stroke, same carb, different timing. Can I get 5 more ponys out of my 70, of course when I get the darn thing to run good at WOT.
Motor is a 1978, I have rebuilt fuel pump, adjust throttle plate to WOT when at full throttle on control, set the roller on the cam correctly, base timing good, cleaned fuel sys. Adj. highspeed timing 1 degree +&- It does well up to 4500rpm, higher than that it stumbles down to 4300 until I...
