Went to run the flat this weekend and im having a problem. Run wide open from launch for over 6 miles before I came off the gas to slow down for a guy fishing. When I went to get back up and run, the motor comes out the hole great, but soon starts to loose power and slow, ends up almost to a crawl while your still supposed to be running wide open. Any ideas guys?

trash in the carbs maybe

also check your compression


i had a suzuki 75 do as you say oneday when it cracked a piston and lost all compression

I hope its not the carbs....just spent close to 1000$ on new set

trash in a jet could do it though

does it idle good?

or is it hard to start, idle

ethanol fuel will destroy the inside of the fuel line and cause lil bits of rubber and plastic to get into the carbs...a new fuel line, clean carbs, and install inline fuel filter

Have inline filter brand new, got new fuel line last week, but it has always idled ruff even before the new carbs.

Are the jets adjusted correctly? I have a 99 40 yam and if they are not spot on with the service manual and all seals are good, you will have issues, i did. Also check air/fuel mixture