I have been wrestling with this motor for a couple seasons naw and am out of ideas. It is a 2000 115 four stroke.
I went through the filters, including the one in the VST, and have chnged injectors numerous times. It currently runs fine, smooth, starts up like no 2 stroke I ever had. However I can only reach 41-4400 max rpm. From everything I can read I should be in the upper 5,000 range. I do not think it is the prop. it comes out of the hole at an acceptable rate and does not appear to be lugging. The last 1/3 to 1/4 of the throttle does nothing. The butterflies are opening fully. If I hold it back to the 2/3 or 3/4 position and let run it is fine at 4200 or so. If it puch it the last bit it will surge/rev to 4800 or so for a second then moves back to 42-4400 on its own. I am stumped. Is there a throttle position sensor or timing advance system that I need to look at. Any help would be greatly appreciated.
I went through the filters, including the one in the VST, and have chnged injectors numerous times. It currently runs fine, smooth, starts up like no 2 stroke I ever had. However I can only reach 41-4400 max rpm. From everything I can read I should be in the upper 5,000 range. I do not think it is the prop. it comes out of the hole at an acceptable rate and does not appear to be lugging. The last 1/3 to 1/4 of the throttle does nothing. The butterflies are opening fully. If I hold it back to the 2/3 or 3/4 position and let run it is fine at 4200 or so. If it puch it the last bit it will surge/rev to 4800 or so for a second then moves back to 42-4400 on its own. I am stumped. Is there a throttle position sensor or timing advance system that I need to look at. Any help would be greatly appreciated.
