I have pair 2006 250 four strokes one was overheating had new pump and stats put in. now yamaha dealer says powerhead and exhaust housing is corroded. both have been flushed everytime there used.other motor fine.about 10 months out of warranty. Yamaha corp. says they cannot do anything, nobody...
"lost top speed, ran solution
"lost top speed, ran solution of seafoam through. the problem got worse. we changed all the filters
and plugs, checked the fuel pressure-everything is fine and clear. pulled the silencer off and about 2000 rpm it is popping through the throttle bodies on two top...