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Hi polishpipes10,

Did you see a spark at the spark plug during a test ?

Good morning, Yes I did see a spark after test! But still no luck.

I have another question, I where can i find a cylinder head that is the size of the one pictured on the LEFT? That is the one I need and i cannot find it anywhere for the life of me, everywhere only seems to have the "shorter" one on the right? I think the previous owner may have installed a big bore kit, but not sure how to tell. Any tricks as to how to tell if the engine has been upgraded with a Big Bore Kit?

 OK, cool yes I see how that would be a major problem so I am going to go and do that now and I’ll get back to you and tell you what my results are thank you again .

You can just have a close look at the camshaft sprocket. It will have two small holes and two big holes between the center and outer edge of the sprocket.
When the piston is at TDC, the two smaller holes will be in line with the top of the cylinder head.

While the two smaller holes are in line with the cylinder head, you also need to have a good look at the position of the camshaft lobes. If the piston is at TDC, both camshaft lobes will be facing towards the REAR of the engine.

It the lobes are facing towards the front of the engine, it means the piston is NOT at TDC, and the crankshaft needs to be turned another 360 degrees - until the two smaller holes at the sprocket will be in line with the upper level of the cylinder head again.
Or, if you are a bit unsure about using the camshaft lobes as pointers:
- if the two smaller holes are in line with the upper level of the cylinder head, you can have a look at the timing marks at the Flywheel. If the piston is at TDC, the timing mark at the flywheel will be in line with the timing mark on the engine casing. If the timing mark on the flywheel does not line up with the timing mark on the casing - it means the engine needs to be turned another 360 degrees, until the two smaller holes at the camshaft sprocket gets in line with the upper level of the cylinder head again.  The piston will then be at TDC, and the timing marks on the flywheel and engine casing will line up with each other.

You can also have a look at the video below . Don't worry if your scooter is not the same model as the scooter on the video. These scooter engines are similar to the GY6 engine copies, and the timing marks at the camshaft sprockets, flywheel, and engine casings are exactly the same.



P.S. (There is no need to remove the carburetor - the video is just to show the holes at the camshaft sprockets, as well as the timing marks on the camshaft pulley and engine casing.)

Thank you for the video link it was very helpful, however, my flywheel with the markings T and F are clearly visible. The problem I am having is I cannot find for the life of me the mark I am supposed to be lining the T up with. I have seen at least 4 different articles telling me 4 different places it should line up with, none of which have worked. One said to line it up in the center of the "V" on the casing. Another shows me an area on the casing that does not exist on mine. You get the point. I would like to avoid having to pull apart and reassemble everything each time I need to check if the mark is indeed lined up with the casing. I have been troubleshooting this for over a week now with no transportation and have missed work because of this. It is very late here, but I will attach a pic tomorrow of my flywheel and the casing that I have (which doesn't seem to match ANY other casing I have found in my research). Hopefully this is something really simple and I will been able to get this thing to turn over again and be on my way, but as of tonight, After lining up the marks on the camshaft and making sure the larger hole is away from engine (up), along with trying to find this mystery mark on the casing near the flywheel, all I get is the sound you get when you turn the key and try and start but it just keeps trying to start but justs keeps rolling the camshaft and the flywheel with no actual turn over of the motor starting. THIS HAS BECOME SO FRUSTRATING! I AM READY TO THROW IT OFF A BRIDGE! JK!!

So another quick question, if the timing is off, is that a reason why the engine will not actually start up? or could I have the timing right and maybe something else is causing the problem? Also when removing the cylinder head earlier this week, (which is the entire reason I began this repair because spark plug hole is stripped beyond repair) I notice a piece of a VERY strong magnet fall out of somewhere. Any idea what that might be and could that be causing my problem as well by any chance.

Thank you so much for your replies and I look forward to your next response.

Allan