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Post by dejavu165 on Jul 21, 2019 15:56:57 GMT -5
Ok, I am getting really frustrated with my gy6 150. It's been burning a lot of white oil smoke since I bought it used. So a while ago I replaced the top end with a all new piston and rings. The rings are all gaped right and I staggered the gaps around the piston. But it still smoked like crazy. I opened up the head again found a small amount a oil pooled in the cylinder. The oil level is dead on. What can be making the oil get in the cylinder?? I thought maybe something was wrong with the head, so I replaced that with the help. Could there be something wrong with the oil pump? How does that little pump work exactly? How does it get oil up to the head?
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Post by 190mech on Jul 22, 2019 5:39:14 GMT -5
Oil is pumped up one of the cylinder studs to lube the cam area,the excess drains back down the cam chain area..A loose intake valve guide,intake guide seal will allow oil into the cyl,also the oil control ring must be installed correctly or it will let oil by and cause the same problem..
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Post by dejavu165 on Jul 22, 2019 10:02:29 GMT -5
Ok. I'm not super familiar with all that valve stuff, but I replaced the head with all new valves just to eliminate that as a possibility. So I don't think the guides or the seals shouldn't be an issue, right? If I'm missing one of those little guide cylinder things that help line things up and hold gaskets on, would that be an issue? Man this is frustrating me haha
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Post by sToRm on Jul 22, 2019 10:22:57 GMT -5
I had a similar issue when I swapped a cvk carb for a pwk, and it was smoking because I put in too much oil.
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Post by 190mech on Jul 22, 2019 16:59:20 GMT -5
Ok. I'm not super familiar with all that valve stuff, but I replaced the head with all new valves just to eliminate that as a possibility. So I don't think the guides or the seals shouldn't be an issue, right? If I'm missing one of those little guide cylinder things that help line things up and hold gaskets on, would that be an issue? Man this is frustrating me haha Yes,all the dowels and seals must be installed in the correct order!!
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Post by dejavu165 on Jul 22, 2019 18:02:30 GMT -5
Ok. I'm not super familiar with all that valve stuff, but I replaced the head with all new valves just to eliminate that as a possibility. So I don't think the guides or the seals shouldn't be an issue, right? If I'm missing one of those little guide cylinder things that help line things up and hold gaskets on, would that be an issue? Man this is frustrating me haha Yes,all the dowels and seals must be installed in the correct order!! Ok but I should assume thats all fine with the new head right?
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Post by 190mech on Jul 22, 2019 18:27:44 GMT -5
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Post by dejavu165 on Jul 22, 2019 20:06:55 GMT -5
Ok I got ya. I'm pretty sure I installed 2 dowels in between each component. They can only go in 2 specific hole right? If not I may have put them in the wrong holes. Its hard to tell exactly where they go in that pdf
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Post by dejavu165 on Jul 22, 2019 20:43:22 GMT -5
Ya just took the engine apart again. All the dowels were properly installed... I thought before hand that a dowel was supposed to be in the hole in the cor rner with the grooved out section, shown in this pic. While I had things apart, I check the gap of the top ring and it was right on .008. Any other idea before I put this thing back together? I did a lot of work to this thing. I had to replace the crank shaft. Maybe I screwed up the oil pump? But I doubt too much oil would be the result of that!
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Post by GrumpyUnk on Jul 23, 2019 11:48:58 GMT -5
What is your oil check procedure? You do not screw the dipstick in when you check the level. You must also have the machine on the center stand on level ground. If you screwed the dipstick in when checking, you would end up with a too-high oil level, which would lead to the crankshaft poking into the oil and creating more hurricane of oil being blasted around inside, which could overewhelm the oil control rings. I remember checking oil on a Honda 350, following the procedure I though, but found I was overfilling all the time, and causing the oil to be burned. It would be low each time I checked... When you put the valve stems into the guides, it would be worthwhile to check how much you can wiggle the 'tulip' of the valve with the two seating surfaces close together, say 1/8-1/4". You should not get much wiggle when the stem is mostly in the guide. If you have a lot of wiggle, the guide may be worn, which would allow more oil consumption. Did you place seals over the tips of the valve stems before installing the springs and keepers? tom
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Post by dejavu165 on Jul 23, 2019 21:02:07 GMT -5
I check the oil by poking the dipstick in and it reads half way up the X's. When I added oil after the rebuild I put in 750 ml. Again, I installed a brand new head with the valves already installed.. Are you talking about the dowels being worn?
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Post by GrumpyUnk on Jul 24, 2019 9:09:48 GMT -5
I would not expect a brand new head to have valve guide problems, nor valve seal problems.
When you say it burns oil, do you see blue smoke from the exhaust? Generally oil in the combustion chamber will create blue smoke when it burns. If there is leakage past the oil control rings, the spark plug will many times get covered with wet looking deposits of carbon, to the point there is no gap, and the plug gets covered with an oily goo. If you have a clean spark plug, and no blue smoke, you may just be leaking the oil, but I'd expect drops on the ground. I think 750ml should have been fine. tom
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Post by dejavu165 on Jul 27, 2019 16:37:51 GMT -5
Ya I suppose the smoke does look slightly blue. I just put everything back together. The spark plug was starting get pretty dark, so I replaced it. This time around there was a lot less smoke. Still some, but not nearly as bad as before. So maybe I just need to run it and everything from before is maybe just burning off. I ran it at a about half throttle for just a few mins, and notice oil bubbling up from the plastic shroud just below the carb. Not good. I didn't replace the paper gasket putting it back together this time because it look perfect. I may have a new set of problems.
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