I've been working on a mx 450 I've adopted this winter. When I start it up it blows some blueish smoke for the first minute or so and I have also notice it spitting oil out filler overflow tube.
How much of this is normal? Oil doesn't indicate it being too full. Sounds like rings and scoring?
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Re: spitin oil and smoke
Oil is too full or scavenge pump is not pumping properly. Look down into the oil fill hole in the frame do you see oil flowing? If the oil is too full or the scavenge pump is not pumping then crankcase pressure is increased to the point where it starts blowing oil out of the vent into the airbox area... I would go with oil being too full. Drain the oil from the frame and engine and add 1 qt, perhaps a HAIR over, but not 1.5qts. 1.5qts is always too much for ours, I barely go over 1 qt. We have about 18 Dales in our group that we ride with, so we are used to seeing this.,,,
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If you have a rad on that unit you have a warped head and the water is leaking into the piston.... stop using immediately as this problem will lead to major engine problem as water does not compress and will either crack the head or blow the Rings.. if no rad then check to see if there is water in the gas.... if neither then it is probably oil burning but that smoke should be blueish...
Is it condensation or actual smoke? White smoke is associated with diesel mixed in petrol and with quite strong smells. I suspect that it is condensation as water vapor is a by product of combustion and the motor/exhaust will have to warm up to clear it. Check for water droplets at the end of the exhaust to confirm condensation. Burning oil will cause a blueish smoke to emit from exhausts.
When you say blue smoke, I assume you're meaning oil burning. Is there a characteristic oil burning smell to the smoke? Have you checked the compression? The blue smoke sounds like it could be caused by sticking rings. I personally never store a bike completely dry. I would change the oil before storage, fog the cylinders or run an ounce or two of oil through them with the plugs out, replace the plugs and, depending upon the anticipated duration of storage, either fill the tank with stabilizer and Marvel Mystery oil added to the fuel or drain the tank. A more likely scenario is that the smoke you're seeing is caused by carburetor floats not rising enough to keep the fuel in the bowl at the correct level. As far as the fuses blowing, you will need to isolate each circuit and trace it through. It's possible your wiring could have been chewed up by mice.
The cylinder is in the front of the bike and on a down hill the oil in the crank case could be pushing past the ring. Yes, it could be an over full situation. Only run the recomended amount of oil. You can actually rob yourself of power and do damage by over filling. I've already seen a guy blow the soft plugs right out of his Yamaha by over filling the oil. Also, be careful when changing your air filter. It can be very easy to drop dirt inside and that will definately score your cylinder walls and cause permanent smoke. It is most likely exactly what you think it is. Good Luck.
If engine is cold, fill oil again to oil level and letit idle for about 5-15 minutes.. See if any white-blueish smoke comes out from exhaust when started or anything leaking anywhere. If any leaking, post your observation. Cheers.
Yes, the piston rings are starting to wear allowing some oil into the cylinder when it sits idle .There are some things you could do such as switching to a high mileage oil that is specially formulated to help or maybe an oil additive. The bike still runs great i'm sure and will probably run for years before any major work needs done. hope this helps