Ok, I know I am running a little rich with 0 air leaks (I know for sure, leaktested) I know I am rich, I have the airbox lid off and if I put it on it don't run right. I am running a 290 now, used 300 first and it ran good but the 290 seems better. I have not plug chopped but am going to. My question is I rode for about 45 minutes the other day and the quad ran great but when I got home I noticed the connector to the headpipe to silencer (rubber one) was melting some so I put my temperature gun on it and it was 254 degrees. I am not sure if the exhaust connector was bought for that or if the PO may have just used a piece of clear rubber. Anyway is 250-260 too hot and what could cause that besides being lean. My exhaust isn't blocked either.