Hey all I am somewhat new to side by siding but went earlier this year and got hooked while driving someone elses machine. i decided to buy my own but didnt want to spend an arm and a leg. i loved the look of cf motos and took some of the bad publicity with a grain of salt. I bought a pretty  decked out 2018 cfmoto zforce 1000 with only 2900 miles .i have been enjoying it a lot. Took it for a nice trip to a great park in Nebraska and it climbed hills like a mountain goat and kept up or passed up almost anything else.I then did the stoopid thing and accepted a dare to go through a mud hole with water up to the doors. There was already a can am stuck right next to me but I thought what the heck. I was told to put in high 4 wheel going in . I aaaaaalllllmost got through but too steep on the front side to get any grip.THATS when I did the stoopider thing of rocking back and forth without shifting back in to low. By now most of you have guessed I smelled rubber. After we all got  winched out my zforce ran ok but would not go over 18mph . i since then washed everything off and put a new gates belt on.The primary clutch sheave had a little build up of rubber but cleaned up well.Now everything working great up to 17mph . Starts great,runs great ,good power(I am breaking in new belt so not pushing too hard) I can go 17mph all day no problem. The second it gets to 18 total shutdown until under 18. does it in high and low exactly at 18mph. I have aftermarket 4 point harness so i dont think seat belt ,parking brake is off,no codes on dash,runs great so I dont think plugs,I cleaned air filter (not really dirty). Have not messed with ecu  but I think it is cutting out spark. I have read about a 18mph speed limiter can anyone share some light on where that is and how to check. I have been amazed on how helpful you guys have been when someone asks questions hopefully we can figure this thing out.Thank you in advance.