Thread: Black oily crud in my exhaust
05-12-2009, 11:53 PM #1
Black oily crud in my exhaust
Last weekend after a brief rest the XLT started to sound strange, seemed a little low on power and the exhaust had a definite lower deeper sound to it. Just did not feel right. Got it home and flushed it out and the idle seemed low. I changed the fuel filter, looked dirty then ran it on the hose, no change. I did notice a lot more smoke than usual when I reved the engine and the cooling water looked like it had a lot of oil in it and it looked dirty. I collected some in a bottle and took a picture.
I couldn't find anything by searching, so I thought I would throw it out to the experts before I start tearing into it blindly, anyone have ideas?
05-13-2009, 12:02 AM #2
your jacket water could be leaking through a gasket into your exhaust pipe and washing out the carbon buildup causing the oily dirty look to it. other than that i don't know much about your model.
05-13-2009, 12:17 AM #3
that makes sense, guess I should get that stinger off.
05-17-2009, 02:39 AM #4
I don't know what to think about this problem.
I took off my stinger and it is not coated with oil, no cracks I can see and no evidence of water inside. At the bottom of the pipe where it meets up with the water lock (as it's called in the service manual) there is a puddle of black oily sludge. It is all in the water lock as well, but it is floating on the water that is still in there and has coated the sides (3rd Picture.
Moving up the stinger there is some at the top in the inner rubber coupler that connects the stinger to the u shaped exhaust chamber (pic #4). the exhaust chamber looks normal (1st picture from today 2nd picture from 1 year ago)
My compression is ok (todays readings and 1 year ago):
Cyl today May 2008
#1 - 108 - 112
#2 - 115 - 108
#3 - 105 - 115
When I ran the compression test I had all the plugs out the the two cylinders that were open sprayed fuel all over the place, a lot of fuel / oil sprayed out. I was very happy the plug wires were grounded, is this normal? I put new spark plugs in before I ran it last weekend, the old ones looked real good, a nice medium brown color.
I am stumped, any one have any ideas, Should I keep removing exhaust parts up to the manifold? I haven't checked the power valves, but the servo motor is working and the shafts are all moving.
Any help would be appreciated.
05-17-2009, 03:02 AM #5
-2 other plugs in.
-Ground all wires.
-Should be 110-125 on all cylinders within 10% of each other.
All compression testers are different, so what you are looking for is ballpark and more importantly, the difference between jugs.
Don't be afraid to pull the head and look inside too.
05-17-2009, 03:18 AM #6
Thanks Mark, I thought I was doing it wrong. should have looked it up on the hulk first. I will test again again tomorrow.
05-17-2009, 08:51 AM #7
Brent are you running oil injection or premix?
05-17-2009, 11:27 AM #8
Hey Oside, I am running oil injection, I was thinking the cable on the pump may have come off resulting in it pumping at max capacity, but the cable is tight. I haven't got to the front of the engine to check the pump.
Since I have the stinger off should I rebuild the carbs, its been about 50 hours? I am going to pull the flame arrestors and look down them anyway see if the pump is malfunctioning. The plugs looked great though.
05-17-2009, 11:31 AM #9
50 hour is not much if they are working good don't mess with them. I would check that cable to the injector, but if were mine it would be coming off and going to premix never a doubt then.
05-17-2009, 11:52 AM #10
I have seriously thought about premix especially with 290 hours. It is so convenient to fill up with straight gas. If I switch was thinking about putting a 50 gallon truck bed transfer tank on my trailer instead of the can rack.
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By motoxxace in forum Polaris Open DiscussionReplies: 5Last Post: 07-11-2011, 09:19 AM
By rcb in forum Yamaha Old School SkisReplies: 4Last Post: 08-20-2009, 09:34 PM
By wakewhornc in forum Yamaha PWC Performance (2-stroke)Replies: 7Last Post: 03-10-2009, 06:35 PM
By Ultra Junkie in forum Kawasaki PWC Performance (4-stroke)Replies: 0Last Post: 07-15-2007, 11:23 AM
By Shibby1485 in forum 4-Tec PerformanceReplies: 8Last Post: 10-24-2005, 10:46 PM