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Post by dickyh on Sept 23, 2015 16:36:08 GMT -5
I'm creating a new thread for this relating to my other one - Help! Valve Issues I've decided to go with a new top unit as I'm pretty sure I burnt the Piston and Valves by wrong lash settings. Anyway, I've been watching videos about how to remove and install the piston housing and cylinder head as I ordered new of both. My dilemma is that everything I see has the valve cam assembly as 2 pieces while mine appears to be one piece and am unsure how i get the chain back over it while keeping it a TDC. Everything I've watched shows "dipping the Camshaft" and mounting the chain, but with one piece I don't think I'll be able to get the chain over it. Am I missing something here? Is it really two pieces that appear to be one? or something else? Another question is that the chain sprocket has alignment lines for TDC but there are two of them and WY on one side. Is this what faces forward, as each way places the cams in different positions. Pics show what I have. Thanks in advance for any help or info you can offer.   |
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Post by tvnacman on Sept 23, 2015 18:29:11 GMT -5
I saw the top of your piston and the valves , everything looks normal.
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Post by dickyh on Sept 23, 2015 18:49:59 GMT -5
tvnacman Thanks! I was sure that this was not normal but have never looked inside one of these engines before. So i guess I wasted money buying new. However, I think that the exhaust valve had actually gotten stuck open as when I pulled the head the collar pretty much came off in my hand and the rocker arm for the exhaust at no free play at TDC at all as the intake had a little. Anyway, I hope replacing everything will fix my problem. Any ideas on my valve cam issue?
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Post by JoeyBee on Sept 23, 2015 19:05:48 GMT -5
what type of scooter is it?
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Post by dickyh on Sept 23, 2015 19:10:40 GMT -5
It's a 169cc 161qmk
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Post by ghcoe on Sept 24, 2015 9:36:07 GMT -5
I just replace a head on my sons 161qmk. That is a totally different head design than a standard GY6. Not to mention a real pain to find parts for. GY6 cams will not work with this design. The two bolts on the gear holds the gear to the cam. To install remove those bolts. First I would put the engine at TDC before putting the head on. That way you do not have to fiddle with the chain so much. Then you can bolt the cam housing to the top of the head, made sure your cam lobes are facing down towards the top of the head. You should at this time notice that the bolt holes in the cam should be nearly lined up with the top of the head. Now you can slide the gear into the chain and line up one of the lines on the gear with the top of the head. You might have to mess with the links a bit, but one of those lines should be parallel with the top of the head with the motor in TDC. Not sure what the WY stands for and I am not sure if it matters. The only thing I can think of is that it is a visual to see if you are in exhaust stroke or compression stroke. I installed my sons with the WY showing once installed. When we worked on my sons we found parts hard to locate or on back order. Finally had to reuse the old head gasket to get him back on the road. We used copper spray gasket to get him rolling again. Still running fine. itistheride.boards.net/thread/7662/oil-leaking |
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Post by dickyh on Sept 24, 2015 11:25:42 GMT -5
I just replace a head on my sons 161qmk. That is a totally different head design than a standard GY6. Not to mention a real pain to find parts for. GY6 cams will not work with this design. The two bolts on the gear holds the gear to the cam. To install remove those bolts. First I would put the engine at TDC before putting the head on. That way you do not have to fiddle with the chain so much. Then you can bolt the cam housing to the top of the head, made sure your cam lobes are facing down towards the top of the head. You should at this time notice that the bolt holes in the cam should be nearly lined up with the top of the head. Now you can slide the gear into the chain and line up one of the lines on the gear with the top of the head. You might have to mess with the links a bit, but one of those lines should be parallel with the top of the head with the motor in TDC. Not sure what the WY stands for and I am not sure if it matters. The only thing I can think of is that it is a visual to see if you are in exhaust stroke or compression stroke. I installed my sons with the WY showing once installed. When we worked on my sons we found parts hard to locate or on back order. Finally had to reuse the old head gasket to get him back on the road. We used copper spray gasket to get him rolling again. Still running fine. itistheride.boards.net/thread/7662/oil-leakingThanks So Much! was stressing out over this... this helps a lot! |
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Post by gy6er on Sept 24, 2015 11:37:36 GMT -5
Scrappy has parts,but according to him he sells cams that will work with 80 mm stud spacing models and traditional 76 mm spacing. On left of scrappydogscooters.com look to gy6-200 gy6B dedicated page and check out all the parts. Good luck.... I love my 161QMK. Hope yours is running soon!
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Post by cyborg on Sept 24, 2015 11:44:24 GMT -5
lets see a pic of the cylinder,,maybe a hone to break the glaze and new rings and you can assemble it and call it a deal
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Post by dickyh on Sept 24, 2015 14:02:25 GMT -5
Scrappy has parts,but according to him he sells cams that will work with 80 mm stud spacing models and traditional 76 mm spacing. On left of scrappydogscooters.com look to gy6-200 gy6B dedicated page and check out all the parts. Good luck.... I love my 161QMK. Hope yours is running soon! this is where I bought the head and top end but he doesnt show any camshafts like mine, which as I said is one piece and there ins nothing wrong with the one I have. |
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Post by ghcoe on Sept 24, 2015 14:28:50 GMT -5
Scrappy has parts,but according to him he sells cams that will work with 80 mm stud spacing models and traditional 76 mm spacing. On left of scrappydogscooters.com look to gy6-200 gy6B dedicated page and check out all the parts. Good luck.... I love my 161QMK. Hope yours is running soon! Yes, that is where we got the head and the gaskets. Gaskets where on back order at the time took 2 months to get the gaskets. He wanted to be able to ride without waiting so I tried the copper gasket trick. It is a old school way to save gaskets. We had nothing to loose so I decided to give it a try. Still running fine.
The problem with the cam is that the gear has to be removable to get to the C clip that holds the cam into the rocker assembly. There is also a anti kick back tab on the opposite side of the gear. I looked high and low for a cam, but could not find one. In my sons case the cam was damaged some.
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Post by dickyh on Sept 24, 2015 14:42:44 GMT -5
Scrappy has parts,but according to him he sells cams that will work with 80 mm stud spacing models and traditional 76 mm spacing. On left of scrappydogscooters.com look to gy6-200 gy6B dedicated page and check out all the parts. Good luck.... I love my 161QMK. Hope yours is running soon! Yes, that is where we got the head and the gaskets. Gaskets where on back order at the time took 2 months to get the gaskets. He wanted to be able to ride without waiting so I tried the copper gasket trick. It is a old school way to save gaskets. We had nothing to loose so I decided to give it a try. Still running fine.
The problem with the cam is that the gear has to be removable to get to the C clip that holds the cam into the rocker assembly. There is also a anti kick back tab on the opposite side of the gear. I looked high and low for a cam, but could not find one. In my sons case the cam was damaged some.
so does this sprocket come off fairly easy, havent tried yet but like everything chinese I'm thinking it will be a real pain to get off. and I guess I'll be using lock tight putting it back on, correct? |
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Post by ghcoe on Sept 24, 2015 19:08:33 GMT -5
The one on my sons scooter was fairly easy to take off, just take off the two bolts. I would use some lock tight for sure. Seems the factory used some kind of lock tight, it was white and pasty on the threads anyway. Just make sure you do not over tighten those bolts. They are fairly small so it would not take to much to strip them.
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Post by dickyh on Sept 24, 2015 19:36:56 GMT -5
The one on my sons scooter was fairly easy to take off, just take off the two bolts. I would use some lock tight for sure. Seems the factory used some kind of lock tight, it was white and pasty on the threads anyway. Just make sure you do not over tighten those bolts. They are fairly small so it would not take to much to strip them. thanks! was able to get them loose with a little effort. did you replace your cam and if so where, which one ? for future reference if I ever need to get one... |
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Post by gy6er on Sept 24, 2015 19:42:26 GMT -5
Ever tried GY6 store... I got clutch from them. Free shipping and was quick, but never bought anything expensive. They do have gy6b stuff. Taida too!!
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