To change a 15 hp motor into a 25 hp motor, you would need to replace the motor entirely with one that is rated for 25 hp, as simply modifying the existing motor is not feasible or safe. Upgrading to a higher horsepower motor involves ensuring that the electrical supply, drive components, and mechanical systems can handle the increased power. Additionally, you must consider the motor's cooling requirements and mounting compatibility in the system. Always consult with a qualified engineer or technician for such modifications.
25 HP is 25 HP, no matter how you slice it and dice it.
depends on the year, probably 50:1, if its an old motor, it might be 25:1
15 hp
A 15 hp game fisher motor is most often a 2 stroke engine. However there can also be a 15 hp game fisher motor that is a 4 stroke as well.
The 25 hp Johnson outboard runs a plug gap of .030 in.
I have a 1973 15ft valco. I run a 25 hp jet. It seems to do fine but I wouldn't go any bigger.
A 15804b is a 1978 motor.
To answer this question the voltage of the motor must be stated.
8-15
20/1
This will depend on the motor. You should ask the manufacturer.
What is the oil to gas ratio for a 15 hp force outboard moter