How to increase horsepower on a Mercury 2.5hp 2 stroke outboard motor.
Short video how to increase horsepower on Tohatsu built Merc/Mariner/Nissan/Tohatsu 2.5hp and Parsun 2.5hp [ Chinese copy of Tohatsu ] 2 stroke from 2.5 to 3.3-3.5hp.
1st – replace original slide valve with shorter Tohatsu part nr 309-03106-1 THROTTLE VALVE [ about ] or cut a little bit off the original throttle slide [ 7 millimeters or 0.275591 inch ]
2nd – extend the slot for throttle lever .
Happy boating !