trx 300ex

I have a 1998 TRX 300ex the ATV idels fine and seems to run perfect at low and high rpms but at about 3/4 throttle it sputters in every gear, of I keep throttling down through the sputter eventually it will start to run normal again in higher rpms takes like 2 seconds but runs fine is this a...

my son has a 1999 honda 300ex and there are 2 hex bolts and when i sent it to the shop they told me the housing was cracked and the old barring casting is shot so i got a new lonestar bearring casting and im haveing trouble finding out how to pull the axles to pull the swing arm and have the arm...