My Atv started to have a exhaust leak not even a month after I purchased. The leak only has gotten worst. But at the same time it boosted my Atv performance.
Then 2 days ago I’m doing around 75mph and the check engine turned on and gave me a check engine code 84. I disconnected the battery waited about five minutes and reset. It worked fine. But after a while the tachometer started to go down to zero mph when I would rev it. When I let go of the throttle the mph would go up to 50mph even if the Atv isn’t moving. Does anyone have an idea of what it could be? I just dropped it off at the dealer to get repaired but I was still curious. Thanks any help would be appreciated.