450er oil leak

[dpizz450]

My cousin has an 07 450er and its leaking oil by the air box but we cant figure out why its leaking out of this area?:confused:

it leaks out alot when revved real high. it has a full hmf exhaust system with a HRC kit.

heres where its leaking

[dpizz450]

heres another picture

[HBRIG014]

Well if im not mistaking that hose that you have it the picture is a overflow tube that should be ran down to the bottom. I think. hope it helps

[dpizz450]

Originally posted by HBRIG014
Well if im not mistaking that hose that you have it the picture is a overflow tube that should be ran down to the bottom. I think. hope it helps

thanks. ill look into that. anyone else have any suggestions or input? can anyone confirm this is an overflow tube? we jus want to be sure so we dont ride it and screw anything up. thanks

[All250R]

I presume that hose leads to the trans oil. In worst case situations you'll find a bearing going bad and somehow heating or otherwise pushing the oil out of the breather tube. In my 4x4 I had this problem in the front diff. Highway driving would yield an underbelly coating of gearoil from the beather tube. We found metal shavings in the drain pan in that case.

Could it also be a compression leak between the crankcase and the trans? Either way it looks like what you have is a high pressure area leaking into a low pressure area (atmosphere). Hopefully its just too much oil and its expanding out!

[06 Honda 450R]

a few months ago oil leaked out of my hose and i had it checked and there was slack in the piston so oil was gettin on top so i had to hone the cillindar out and get a new piston, that happened 3 months after i got it brand new

[TCracin440ex]

btw tell him to tighten his bolts up on the subframe ;)

[450R_lover]

I had a buddy that had this happen to his after his mechaic adjusted the valves. The reason was because the hoses were in a kink at the T. The mechanic just put them in the wrong places which caused them to bind at the T. Also, make sure the tranny side doesnt have too much oil in it. that could also cause this. Good luck.

[Colby@C&DRacing]

Most of the time when we get a 450 in for oil out the vent tube it has a crank seal that it out. This forces pressure into the tranny and blows oil out the vend. It also could just be over full on oil.

[gcart2]

Originally posted by Colby@C&DRacing
It also could just be over full on oil.

thats the most common reason IMO.

scares a lot of ppl.

[twink07]

hey man i have an 08 and it had the same thing going on ..... i just ran the line to the bottom of the 4-wheeler... also check the one on the right side of the bottom becuase 85% of the time it is comeing from that to... aslo if the the one that goes in to the air box it could either have a hole in it becuase he honda people put it to chose to the engine and it get hot and starts pulling little hole in it ... if you need any more help just pm me and ill help u man

[cub22]

Anybody else still having this problem ? I can't seem to fix it..ideas ?

[DnB_racing]

you more than likely have a crank seal gone!!! are you noticing any thing strange with oil levels dropping on cylinder side and over full on clutch side?
post a new post under your name with all your symptoms and Im sure you'll get some answers try not to post your problems on other members, I see your new so post up and enjoy the wealth of knowledge available to you from some very educated members. welcome to the forum!!

[cub22]

thanks for the heads up..I posted a new thread with pics.

http://www.exriders.com/vbb/showthread.php?s=&threadid=444321

[quad9]

you might want to also tighten up your sub frame mounting bolt.