New Rider
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Posts: 12 
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Joined: Apr 16, 2014 22:13:12 GMT -5
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Post by brokescoot on May 30, 2014 12:34:57 GMT -5
Smoke is coming out of the breather tube looks white smoke, its good amount of smoke too enough to fill the under seat area and seep out from under the seat when closed!
Is this the piston rings?oil level is not too full.many of miles are on rings like 8500 miles
I seen blowby past both rings when I last had engine apart 1 week ago to clean piston grooves.
It runs fine despite the smoke coming out t he breather tube!~
My question is what makes smoke pour out of the valve cover breather tube
Thanks
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Post by skuttadawg on May 30, 2014 21:41:42 GMT -5
I cracked a piston and when I removed the tube it smoked . Do a compression test
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Post by jjoshua20213 on May 30, 2014 23:18:54 GMT -5
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Post by rockynv on May 31, 2014 4:51:05 GMT -5
If the valve gaps are set to wide then you will get excessive blow by since they will be closing early and opening late. Rings should last more than 8,500 miles.
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Post by jjoshua20213 on Jun 2, 2014 0:20:38 GMT -5
If the valve gaps are set to wide then you will get excessive blow by since they will be closing early and opening late. Rings should last more than 8,500 miles. Rings last as long as you treat em. Theirs no mileage range |
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Post by rockynv on Jun 2, 2014 3:48:46 GMT -5
If the valve gaps are set to wide then you will get excessive blow by since they will be closing early and opening late. Rings should last more than 8,500 miles. Rings last as long as you treat em. Theirs no mileage range On a CVT scoot hows to treat them aside from changing the oil regularly and checking the oil level before each ride to ensure its full without overfilling it. Aside from a real major overfill of motor oil cracking the oil ring you'd have to go to extreames running it without oil, going thousands of miles without a change or redline it on the stand until they smoked to blow through them that fast. Even riding a WOT would usually burn a hole in the piston top first or you would be having soft sieze events possible even a hard sieze. Someone who cares about their bike would not treat it that badly. If they do then its their own fault for abusing the bike beyound all reasonableness. In the OP's case hopefull he has done none of the above and may just have a valve adjustment issue or potentially put the compression ring in upside down. |
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Post by jjoshua20213 on Jun 3, 2014 1:17:34 GMT -5
You can also get smoke my over filling oil
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Post by rockynv on Jun 3, 2014 4:30:23 GMT -5
You can also get smoke my over filling oil However it would have to be severely over filled to the point that you could be damaging the rings and foaming the oil which would ultimately lead to total engine failure when the oil pump only had foam to pump and no more liquid oil or the oil slapped the backside of the piston before the foaming got too bad and snapped the connecting rod. |
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Post by jjoshua20213 on Jun 3, 2014 11:00:23 GMT -5
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Post by jjoshua20213 on Jun 3, 2014 11:01:11 GMT -5
You can also get smoke my over filling oil However it would have to be severely over filled to the point that you could be damaging the rings and foaming the oil which would ultimately lead to total engine failure when the oil pump only had foam to pump and no more liquid oil or the oil slapped the backside of the piston before the foaming got too bad and snapped the connecting rod. ? If the connecting rod snapped it wouldn't crank. I've seen these engines over filled. They just blow the excess oil out of the vent, and run like their restricted until l you adjust the the oil level. I've torn down a 50 and seen no damage from over filiing, not to say what your saying is incorrect, but on the 139qmb's ive had or been aroud even honda genorators have been fine after over filling. These engines are small and don't have as high of a flow rate as a bigger engine. Read more: itistheride.boards.net/thread/6030/smoke-coming-out-breather-tube?page=1&scrollTo=69264#ixzz33anQNhCc |
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Post by rockynv on Jun 3, 2014 12:24:08 GMT -5
I don't believe I stated that an engine with a snapped rod would crank (it may become jambed or it may simply spin freely) and only pointed out what could and has happened to others already. We can't be cavalier and state these well know side effects of overfilling small engines with oil won't happen to other. Oil rings do get snapped or shattered and rods do fail from it. Oil foaming from an overfill is also a potential hazard. These are all well documented issues with all engines and while some may get away unscathed not all will all the time.
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Post by jjoshua20213 on Jun 3, 2014 18:27:44 GMT -5
I don't believe I stated that an engine with a snapped rod would crank (it may become jambed or it may simply spin freely) and only pointed out what could and has happened to others already. We can't be cavalier and state these well know side effects of overfilling small engines with oil won't happen to other. Oil rings do get snapped or shattered and rods do fail from it. Oil foaming from an overfill is also a potential hazard. These are all well documented issues with all engines and while some may get away unscathed not all will all the time. Cool dude! _ ( (( \ =\ __\_ `-\ (____))( \---------- (____)) _ (____)) (____))____/---------- |
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Post by tvnacman on Jun 4, 2014 4:46:35 GMT -5
I have seen smoke from the crank case vent , the engine needed a top end rebuild .
John
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