My 98 sxi pro has just been rebuilt with new pistons crankseals carb rebuild kits and all other gaskets. It starts up and runs but sometimes when given throttle I've noticed the exhaust hose after the waterbox that's under the ebox collapse when under throttle and bogs down the motor as well as a slight exhaust backfire. I've done a leak down test on it and I have no leaks what so ever has anyone else come across this issue or have any ideas.
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