On You Tube a fellow in the states has done it. By only changing it to a F15 carb. Both the carbs he used had accelerators on them. Mine has no accelerator on it. With accelerators you have different carb controls. Then I checked out the F15 carb. Its main jet orifice is 104 compared to my T9.9 is 65. If I bought a #37 numbered drill bit and drilled my main jet to 104 using a #37 bit would it give me 15 hp ? This engine of mine is the older T9.9 which has a 323 cc displacement the same as the F 15. The newer T9.9 has a lot lower displacement
