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Changed oil in front diff. and now it pukes oil

Floyd2010-08-11 02:40:29 +0000 #1
I changed the front diff. oil yesterday and added a half quart of 40w Synthetic Royal Purple. Rode the bike today and if you ride at a constant speed it pukes oil out the vent. Do you have to add any type of additives when using synthetic in the front diff. or do I have a problem somewhere?
650Brute2010-08-11 02:49:42 +0000 #2
overfull??
nmkawierider2010-08-11 02:53:14 +0000 #3
Quote:

Originally Posted by 650Brute

overfull??

Yeah I don't remember it taking a full half-quart to the top of the threads. Seems like it was a tad less. And straight 40W? A multi-Vis oil is said to expand less then a single. And even though Kawie says NO to synthetics in the front diff, lots of people do use it and it works OK. They say the diff-lock disks have a harder time coming to complete lock. Have to squeeze a little harder I guess is all.
eagleeye762010-08-11 03:17:34 +0000 #4
Kawi says 10 40 same as the engine. I put mobil 1 10 40 full syn in both engine and front dif. Been on a couple rides and even pulled out two Honda's useing the dif lock with out a problem.
Floyd2010-08-11 03:45:42 +0000 #5
I added about a half quart of 10w 40 royal purple. The same oil I use in the engine. The brute has never done this before. When I filled it up I added just enough for it to start seeping out of the plug where you add oil to. I was thinking I might have added a little too much oil when it first did it, but when it kept doing it, I started thinking the synthetic oil was the problem. I am pretty sure it puked out at least a quarter of a quart today.
nmkawierider2010-08-11 03:36:35 +0000 #6
Quote:

Originally Posted by Floyd

I added about a half quart of 10w 40 royal purple. The same oil I use in the engine. The brute has never done this before. When I filled it up I added just enough for it to start seeping out of the plug where you add oil to. I was thinking I might have added a little too much oil when it first did it, but when it kept doing it, I started thinking the synthetic oil was the problem. I am pretty sure it puked out at least a quarter of a quart today.

Floyd...so...that vents at the pod with the rear and some other stuff on a bank of vent loops...at least it does on my 06. Are you sure its the front? One other thing that can do this is moisture expanding or it heating very fast dire to the diff-lock being set too tight. Back it off a bit and try it. Also, let it sit overnight and unscrew the drain let just a little drop out into a clean pan...about a tablespoon, then screw it back in. Water and other junk will fall to the botton overnight.

Heck I jack the right side up some just so I can overfill mine just a little and never had a problem...but then I use Kawie oil.
blue beast2010-08-11 04:28:06 +0000 #7
I have heard that the synthetic oil is bad also, in the front diff. someone told me it soaks in to the clutches for the locker and makes it not engage properly. but that was not on this site . dont know how true it is , I dont use it because, i have to change my front diff about every time I ride it in deep water, it will look milky. dont want to spend all my money on oil for the front diff. I just get the cheapest i can find for it . on the other hand I do use royal purple in the motor.
Floyd2010-08-11 05:06:44 +0000 #8
Quote:

Originally Posted by nmkawierider

Floyd...so...that vents at the pod with the rear and some other stuff on a bank of vent loops...at least it does on my 06. Are you sure its the front? One other thing that can do this is moisture expanding or it heating very fast dire to the diff-lock being set too tight. Back it off a bit and try it. Also, let it sit overnight and unscrew the drain let just a little drop out into a clean pan...about a tablespoon, then screw it back in. Water and other junk will fall to the botton overnight.

Heck I jack the right side up some just so I can overfill mine just a little and never had a problem...but then I use Kawie oil.

I am not sure which vent it is coming from. I am starting to think it is coming from the rear. The oil that shot out on me smelt like gear oil not motor oil. I pulled the caps off the front and rear diff this morning and they both appear to be full. There was alot of oil that puked out yesterday and I thought I could pull the caps off and see which one is low. That doesn't make sense to me.

The last time it puked yesterday I noticed steam coming from under my pod. When I let off the gas to stop the oil started puking out. I rode in some deep water the last time I rode so water might have got into my rear. This would explain the steam.

I have something going on with the rearend anyways. If it is in neautral it will only roll backward about a foot and then it stops like the brakes grab. It rolls forward fine. If I start the bike up and put it in reverse and give it some gas it frees up. I can then push it freely backwards as long as it stays in reverse. But when I am riding and have it in reverse and let off the gas it feels like the brake grabs and stops the atv. When I am riding in forward and let off the gas the atv coasts to a stop. As soon as I put it back in neutral I can only push it a bout a foot backwards and it stops. Once it stops I can roll it another foot backwards then it stops again. And so on. But, once in a while it will roll freely backwards in neutral. It's like it has a mind of it's own. It just started doing this after my ride last weekend. I took the CVT cover off yesterday and the secondary clutch rolls freely so I am thinking there is something going on in the rear.

With this being said, I think I am going to isolate the vent lines from the pod and run them into a bottle to see which is puking.

Are you referring to the yellow lever on the handle bars when you mentioned the diff-lock? I am new to the brute so forgive my stupid question. If this is the lever, I don't use this lever that much. So I don't think it is my problem but I will take a look at it. Thanks for the opinions guys, hope to have it fixed in the next day or two.

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