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MY FOUR STROKE MOTOR CYCLE IS BLOWING LOTS OF BLUE SMOKE,THE PISTON AND RINGS ARE STILL FINE AND ARE AIR TIGHT WHAT IS THE PROBLEM PLEASE

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Blue smoke is oil, black smoke is fuel! go to harbor freight and buy a cylinder leak down tester as this will give a proper diagnosis between the rings or valves. do not expect 100% on ring seal as even race cars can not do that but any thing below 80% is suspect. the valve seals can be changed without pulling heads by appling air pressure on the cylinder on compression stroke and the use of a small hand held spring compressor, harbor freight also. make sure you c/c vent is working or it will build c/c pressure and move oil anywhere it can get out bad rings or broken rings means a tear down is necessary.

Posted on Aug 13, 2008

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Your air fuel ratio needs to be adjusted. You're getting to much gas and not enough air.

Posted on Aug 06, 2008

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05 Troy built suoer bronco it has a 19 hp engine.


white smoke usually indicates excess oil consumption. make sure you can turn motor over by hand you should feel resistance when the piston is on the compression stroke ensure ignition is off to do this test. no ressistance would indicate low compression and possible cracked or broken piston ring or. worn piston rings. Test by putting a small amount of oil into combustion chamber the oil will temporarily help seal off the piston rings and result in more compression indicating worn rings.also oil filler breather cap blow by would indicate this as well hope this helps.

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how much smoke because 2 stroke engines do blow quite a lot of smoke it is normal as you mix oil with fuel to lube the cylinder walls and the piston

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If u mean pistons head gasket,yes,it can smoke.
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Blue (whity):worn pistons rings.

Chears.
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Are bike is having a little smoke coming from the exhust pipe we think it might be the antifreez we just moved from florida our manual is packed away just need alittle advice


is it blue coming from the exhaust
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I just bought an 03 RM250 and the dude told me that he had just rebuilt it. I picked it up at night so I didnt notice the smoke then. When it runs man it pours blue/white smoke terrible. I thank it may...


Is this bike a two stroke or four stroke.Meaning do you mix oil n gas,or dose it run on straight gas .If this a two stroke,its normal to blow blue smoke,but not that bad.Sounds like the person before you put to much oil in gas or piston rings are shot.There are exact oil to gas ratios you must follow with a two stroke engine.If you dont, you can have all kinds of problems.

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Bad Piston,Bad rings,bad valve seals,Cracked cylinder head.cracked block. Don't forget now there is a lot of suction and compression going on in a motor. If any of the above are happening in an engine the suction will pass oil through a bad piston or rings or any of the above and cause Blue smoke and spit oil out the exaust along with blue smoke.

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Your piston rings are letting a bit of oil get into the top end. No big worry or concern. As time goes by the smoke may increase or it may not. If it gets offensive then you will need new rings, Possibly a new piston and possibly have the cylinder bored out, ( some cylinders can not be bored ). Just check the oil and keep it at the proper level. Change oil three to four times a year. Not changing the oil is probably what has caused the problem. Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives.

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sounds like the bike is in need of new piston rings especially if that much oil is blowing on such a newer bike. if the crankcase is not overfilled, then focus on rings especially if the sparkplug is oily too.

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