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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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.
White smoke when first started is normal. If white smoke continues you have an internal coolant leak, i.e., cracked head/blown head gasket.
Black smoke is caused by a rich fuel condition.
Blue smoke is caused by oil consumption.
You need to check your oil cap for yellow/white gunk on the cap if you have this then this is a sign your head gasket is cracked. Check to see if your radiator coolant level is down this is also another sign.
I thing there is the compressor wrong.If the power is changing when a smoke is coming from the tail pipe means- COMPRESSOR.Just mention - oil is also type of fuel,but coming blue smoke at the back.Worst-white smoke.That is really bat
there are a few reasons for the engine to smoke. first determine the color of the smoke, white smoke means its burning water...possible bad head gasket or cracked block or cylinder heads. If the smoke is black...means the fuel mixture is to rich, getting to much fuel. If the color is blueish...it is burning oil, meaning the oil rings are worn, and or the valve seals are worn as well. if it smokes when you first start it, and then stops after a few minutes, once the engine is warmed up...probably bad valve seals. if it continues to smoke it is more likely the oil rings. Valve seals being cheaper and easier to repair, where as the oil rings means the motor needs to be rebuilt or replaced.
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.
Blueish smoke is probably excess fuel. If this is the case, the exhaust should smell gassy. I'm thinking that one of the injectors is leaking...something injector cleaner wouldn't solve (you may have to buy a new injector if that's the case). I would check the spark plugs to see if one looks different than the others, that way you can narrow it down. I took my injectors for my porsche to www.witchhunter.com to have my injectors checked and found that a couple of them were leaking so bad they couldn't be fixed. If you send in your injectors to him and any of them are leaky/unrepairable, he won't charge you for them. :)