My 2009 Grizzly 700 EPShas been acting up. It started after when ride when I left it idling while packing the gear up. From idle when you hit the idle it would fall on its face and die. It would run fine at higher rpm once you feathered it past idle ever so slowly. It was coming up for a service anyway so I changed the plug as I figured I fouled it (it looked fine), cleaned the k&n filter, checked valves (were fine) and oils.

It ran great for a few rides then started doing the say thing. Sputtering and bogging at idle but runs fine at high rpm. It seems the long you let it idle for the worse it got. It doesn’t like warming up idling. I figured maybe my map was too rich so I loaded a leaner one with no difference and when I again swapped the plug it looked like a nice burn.

I am not getting any engine fault codes or lights. A buddy did say that my hmf perforance series exhaust shot some strands out when it was really acting up on me. I am running the quiet core but with no spark arrestor. Would the exhaust clog up? I don’t doing extemporaneous mudding with it gut water crossings.

if I have my wheels cranked it doesn’t like the extra load to start from and will just bog.

Anyone have any ideas where to start? I love my grizzly and this makes me sad. I use it almost weekly so the gas isn’t green.

Thanks a lot for your time!