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Post by speedy1125 on Nov 8, 2011 19:40:10 GMT -5
You over filled causing a gasket to blow out in your oil over flow resevoir....silicone is a quick fix but you should be able to find replacement parts for under $50....a d.i.y. job'll save u a bunch but be warned! These chinese scooter's are very very sensitive. Always refill a gy6 150cc with no more than .9L of oil....especially gy6qmj'snever heard of the 'oil overflow res. www.topix.com/forum/motorcycles/scooters/T5ROM13MA7V7Q0DQS
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Post by usmcdoc on Nov 8, 2011 19:53:56 GMT -5
Where is the oil overflow reservoir?. Was also thinking valve stem guides? But again where is the oil overflow reservoir?
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Post by speedy1125 on Nov 8, 2011 19:58:53 GMT -5
dunno.
did you do a compression test on this engine before you took it apart? bad valve guide seals usually make it burn oil especially at startup.
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Post by Fox on Nov 8, 2011 20:12:05 GMT -5
You think maybe there is something wrong with the valve cover? It's supposed to all the pressure out but not a lot of oil.
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Post by usmcdoc on Nov 8, 2011 20:42:02 GMT -5
stroker....it is not burning oil...it is blowing out the valve cover vent like a garden hose...and again....where is the oil overflow reservoir?
Fox....valve cover looks fine...no blockage....and that 'baffle' is in place. So if I blew the seal on the 'oil overflow reservoir'....where may I find that device?
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Post by Fox on Nov 8, 2011 20:49:26 GMT -5
Never heard of one of those.
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Post by stepthrutuner on Nov 8, 2011 21:17:59 GMT -5
Do you have EGR? Is there any way for that to get into the c/c.... through a ruptured vacuum diaphragm or something? A leaking exhaust valve guide could let some of that pressure into the oiled valve mechanism space.
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Post by usmcdoc on Nov 8, 2011 21:57:36 GMT -5
Not sure about an EGR...just a hose from the valve cover vent tube...to the airbox...
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Post by speedy1125 on Nov 8, 2011 23:09:04 GMT -5
stroker....it is not burning oil...it is blowing out the valve cover vent like a garden hose...and again....where is the oil overflow reservoir? Fox....valve cover looks fine...no blockage....and that 'baffle' is in place. So if I blew the seal on the 'oil overflow reservoir'....where may I find that device? yes i understand the problem. was a compression test done? I dont know where the oil overflow res is or if you even have one, it might be that the above comment i posted from another site was specific to the model being discussed. I suppose if you have valve guide problems and leaky valves that could be it. you did say it was down on power. a compression test would have told us some good information. Also you said on the center stand no oil blows out the vent tube but going down the road it does. how do you know its coming from the hose? it is my understanding that the o-ring where the starter mounts to the case can go bad and cause blowing oil as you describe. |
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Post by speedy1125 on Nov 8, 2011 23:29:44 GMT -5
i still think your problem is blowby. if the oil control rings are good but the compression rings are not then you could have the problem you describe with no burning oil. a compression test result would have helped a great deal.
I would put new rings in it. check the starter seal also. if you put new rings and a starter seal on it and it still blows oil like a geyser then its possessed by the devil and should be melted down into soda cans or used as a doorstop.
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Post by usmcdoc on Nov 8, 2011 23:46:36 GMT -5
stroker....I know it comes from the vent tube...because I zip tied it to the frame...and where ever I zip tie it...that is where the oil puddle is. No compression test done yet as oil ring gaps is a mere .0015 and compression rings are .002....so now I will look at the valve guides and valve stem seals. Then do a proper burial..... :bfg:
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Post by speedy1125 on Nov 9, 2011 0:04:04 GMT -5
stroker....I know it comes from the vent tube...because I zip tied it to the frame...and where ever I zip tie it...that is where the oil puddle is. No compression test done yet as oil ring gaps is a mere .0015 and compression rings are .002....so now I will look at the valve guides and valve stem seals. Then do a proper burial.....  dont gap the oil rings just the compression rings.. Top Compression Ring End Gap = Bore Diameter" x .004" Second Compression Ring End Gap = Bore Diamter" x .005" Since these measurements are done in inches, you'll need to convert your bore diameter from mm to in. Bore Diameter In Milimeters / 25.4 = Bore Diameter In Inches 47mm / 25.4 = 1.85" 1.85" x .004" = .007" 1.85" x .005" = .009" set top compression ring's end gap to .007" and the second compression ring's end gap to .009". |
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Post by usmcdoc on Nov 9, 2011 10:00:58 GMT -5
Stroker...my compression rings are a tight .002....vice the .007 many have suggested.....could too tight of rings cause a problem?...want to do a compression test...but who in the hell has an adapter the fit plug hole?....My 2 strokers use the adapters that come with a standard compression kit fine....but can't find one for a gy6....so I wonder what diameter and thread pitch they use?
Also THANK YOU very much for everyones input...this site rocks! 99% of the time I am giving out help..hints and advice which solves others problems....but as fate would have it...I run into one of my own that I can't... :stars:
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Post by usmcdoc on Nov 9, 2011 11:27:55 GMT -5
does the tranny vent hose have to be hooked up to the nipple for it on the breather box?.....and what is its function?....will it cause elevated crankcase pressure and vent blow by? Also per other posts by people...if I loosen our remove my dipstick....oil gushes from it....indicating over pressure maybe....or is this normal?...Tx... Yes I know lots of questions....but in 4 years of serving scoots....this is the only one I can't diagnose and fix...  |
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Post by speedy1125 on Nov 9, 2011 12:14:09 GMT -5
spark plugs only come in 2 sizes 5/8 and 13/16
gearbox hose has nothing to do with it. .002 ring gap is too close.
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