"Tom, you can spend a bundle t
"Tom, you can spend a bundle trying to squeeze 1 more horse out of the motor, but in reality it makes such little difference that it is never worth it on a stock motor.
With that particular rig going from a 70 to a 90 horse would only net you 3 more mph under absolutely perfect conditions - the cost to turn a 70 into a 90 could run you a grand - so is worth 300-400 bucks for every extra mile per hour?
Old sparkplugs can rob you of 5-10% of your horsepower and the wrong prop up to 15%, so just having it matched and tuned properly will assure you of getting as close to 70 horses as possible..."