Re: 97 Yamaha 9.9 MLHV Backfire and cough
I changed the gas first thing i was gonna add some seafoam to the mix, I'm not sure but i have had a hell of a time finging a carb to manifold gasket for this motor, I have been to boat shops the internet even yamaha itself doesnt know if one even exists for it. The shop told me to put a thin layer of silicone or liquid gasket around it to seal it up but i think it may be taking on a little air where the carb meets the manifold i know that a lean mix will cause the fast sputtering and coughing maybe i should make my own gasket for it. oh and i rebuilt the carb exept for the needle and seat. If you see this and you own one of these motors maybe you can give me my answer as to wether or not there is a carb to mainfold gasket for this motor and yes it is a 2 stroke...