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Old 10-14-2011, 09:47 AM   #1 (permalink)
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670 Oil Leak

So I was checking out my mxz 670 the other day and noticed that it is leaking a small amount of oil from what appears to be the bottom of the motor, it really isn't losing that much oil, just enough to notice it on the garage floor. It isn't mixed with any coolant. Just wondering if anyone has a guess at what it could be... All I can think of is rotary valve seal? Any advice is appreciated
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Old 10-14-2011, 05:51 PM   #2 (permalink)
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got any pics
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Old 10-14-2011, 09:43 PM   #3 (permalink)
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I'm new to this but I tried uploading a pic, I'm not sure how well it shows it though. the picture is of the coolant pipe that exits the motor in the bottom (right underneath the y-pipe). After I looked at it closely it looks like there is some coolant seeping through as well, but it hasn't lost enough coolant or oil for me to notice in either the oil or coolant tank. I would appreciate any advice but I have a sneaking suspicion that this may involve a complete tear down... hopefully not though
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Old 10-15-2011, 06:41 AM   #4 (permalink)
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Is it actually dripping onto the floor? If so, it may be the chaincase seal or the grommet on the oil tank itself. It's a 2 stroke, so there isn't any oil in the motor to leak out.
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Old 10-15-2011, 09:30 AM   #5 (permalink)
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Yeah I thought the same thing at first, so I checked the oil lines and the grommet on the tank they all appear to be dry and in good shape. It is leaking on the floor and it comes from right under the motor opposite of the chain case. And its also injector oil (red amsoil sticks out of the floor). It seemed to start doing it after I started it mid-summer, but still it isn't leaking a lot of oil like it would if it were coming right from the tank.
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Old 10-15-2011, 02:35 PM   #6 (permalink)
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Ah Ha!
When you started it up, did you rung it long enough to get the pipe and the exchangers warm?
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Old 10-15-2011, 02:58 PM   #7 (permalink)
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Yeah, I leave oil on the floor too. Sounds the same anyway. Sounds like it's coming from the exhaust??? Maybe??? If so, I think this is normal if you run your sled regularly and long enough to warm it up.
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Old 10-15-2011, 04:00 PM   #8 (permalink)
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When a 2 stroke is not up to temp, a lot of residue will accumulate in the exhaust and will leak out at any joint and blow out the outlet when the engine is run.

If you start it up as I do over the summer, you need to run it long enough to get properly warmed up and then this will not happen.
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Old 10-17-2011, 12:06 PM   #9 (permalink)
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Alrighty thanks for the advice guys, I'll just keep an eye on it sounds like it isn't too big of a deal anyways.
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Old 11-08-2011, 06:27 PM   #10 (permalink)
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Quote:
Originally Posted by Powshredder294 View Post
Alrighty thanks for the advice guys, I'll just keep an eye on it sounds like it isn't too big of a deal anyways.
If it is clean oil you have a bad oil seal behind water pump , the oil drains out of weep hole just behind water pump cover and run's down frontside of motor .
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Old 11-08-2011, 06:49 PM   #11 (permalink)
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I just finished replacing the injector hoses from the pump to the engine on my 96 FIII. The old lines were dry and brittle and had cracked in a couple places, seeping 2 stroke oil under the engine. Not saying that's for sure what's wrong with your 670 but it's something you should check. Leaked enough to leave a baseball size spot of clean 2 stroke oil on the garage floor after running it for 20 minutes and I can't believe the engine was getting as much oil as it should. Could cause engine damage if ignored.
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