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Buddy of mine swamped his machine,but not to badly just enough to make it quit.We pulled it out dried it out, got it running and on we went.Well the last hour of riding he noticed it making a noise. I went and heard it tonight. Even after using Seafoam and two oil changes the sound remains. It sounds like and a pipe inside the another rattling.Its not an exhaust thing, I've used a stethascope and its inside the engine on the clutch/tranny side in the base of the engine.

Any ideas?? Please Help.
 

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He shouldn't of even rode it after swamping it unless he didn't have a choice, there's no telling what kind of damage was done to the engine. does the noise get louder as you rev the engine?
 

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mine makes the same noise. always has. i haven't had it in water more than a few inches above the floorboards. i had the lifter adjusted and it still makes th noise. surely if it was messed up the mechanic would have said somthing.
 

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2001 Honda Foreman 450 ES
Did anyone ever hear rattling noises coming from your engine when going around 44 km/h and letting off the throttle a little? I just had to get a new piston, rings valve seals because the engine oil leaked out of the final drive shaft seal that comes out of the rear of the engine. The engine oil was disappearing and there were no leaks anywhere on the ground. Turns out it was leaking past the seal and directly into the rear swing arm's hollow tubing. When the guy took it apart the swing arm tubing has litres of engine oil in it. It was smoking really bad.
It runs great now but I can hear a slight rattle coming from the engine compartment somewhere. I can't hear it if I'm in neutral and rev up the motor but I can hear it when driving it around. Especially when on the road and giving it throttle. I thought it was the valve clearances. The mechanic set them to speck (.006) when he rebuilt the top end. I had him reset them again a little tighter to .005 but the noise is still there. Wondering if I need to break it in more or if there might be damage in the bearings (bottom end stuff). Hoping it goes away with break in. Any thoughts?
 
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