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I got a 1999 Honda foreman 400 that has been bored out a 670 and when I got it the front diff was busted wide open and i replaced it with one out of a 1999 Honda foreman 450 es that was flooded out about 3 months ago I went to creekside in splendora Texas and when I came out of a deep thick hole heard it knocking so I loaded up and went home but I still dk what the noise is so I need some help
 

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I got a 1999 Honda foreman 400 that has been bored out a 670 and when I got it the front diff was busted wide open and i replaced it with one out of a 1999 Honda foreman 450 es that was flooded out about 3 months ago I went to creekside in splendora Texas and when I came out of a deep thick hole heard it knocking so I loaded up and went home but I still dk what the noise is so I need some help
Did you bore it to a 670, or did you buy it from a guy that says he did? Either way it doesn't add up, even with a stroker crank I don't see how that is possible. Got any pics of it?

Onto your front diff... So you replaced the front diff with a used one that had been flooded? Do I need have that right? After you got the used diff, did you disassemble it, or at minimum flush it out? How smoothly was everything rotating when you got the used diff?
 

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well since we were NOT there to hear the noise, its rather impossible to know what your problem is, based on you saying you heard a knocking sound>
it could be a LOT of things
where is the knocking noise coming from, location,
diff, front or rear, motor, top or bottom,
and I also think its pretty impossible to bore to a 670 in a 400, but guess anything is possible??
but if you went that far over stock, odds are the motor isn't going to last very long, and be rather weakened from all that boring that happened!
 

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Discussion Starter #4
Its the front diff I don't know where its coming from and it gots a rubicon 500 jug and head the jug has been bored to a 670 but the diff has been rebuilt but I 450 axle bars on it
 
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