Are you using a Dixie Chopper belt or an after market belt? All 5/8 belts measure like this a B88 belt is 91 inches as you measure the out side of the belt it will measure 3 inches longer. . If u are measuring the outside of the belt to be 88 inches the belt is 3 inches too short. Always use oem belts when possible.It is a 2020 Classic 3160KW, The belt guide shows an 88” belt for the Engine to Deck belt. So it is extremely tight, so much so that now I cannot get the tensioner pulley back on. I tried to upload pictures but it tells me it is too large for the server.