griffo0246
New member
"I have a 40 HP Mercury lighte
"I have a 40 HP Mercury lightening XR outboard and it is a rebadged Tohatsu. The Tohatsu 40 and 50 hp are the same motor with different jetting, inlet manifold and throttle cam.
The 40 hp lightening xr has the 50 hp jetting and throttle cam. Though the inlet manifold restrictes the intake to half the size of the carby throat.
Is it just a matter of fitting a Tohatsu 50 hp inlet manifold to increase the HP? Or is it possible to cut/grind the inlet manifold restriction plate area to acheive the same result? If so to what size?
This will obviously be done after the warranty period expires."
"I have a 40 HP Mercury lightening XR outboard and it is a rebadged Tohatsu. The Tohatsu 40 and 50 hp are the same motor with different jetting, inlet manifold and throttle cam.
The 40 hp lightening xr has the 50 hp jetting and throttle cam. Though the inlet manifold restrictes the intake to half the size of the carby throat.
Is it just a matter of fitting a Tohatsu 50 hp inlet manifold to increase the HP? Or is it possible to cut/grind the inlet manifold restriction plate area to acheive the same result? If so to what size?
This will obviously be done after the warranty period expires."