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Post by bjg on Apr 9, 2014 11:19:59 GMT -5
I'm in the middle of a vlave adjustment on my 250cc scooter and I'm following the guide found on this site. Everything is going exactly as the guide has stated. I have the covers off both intake and outake valves, I have the plug out above the oil fill, and the cover off so I can see the timing chain. When I look at the casing by the timing chain I can see the alignment mark on the casing but I can't see any mark that I need to align with it. It should be visible through the guide holes as it shows in the picture but it isnt there. I've rotated the engine 3-4 times looking for it. Is there something I'm missing? Is there another way to tell if I'm top dead center so I can adjust the valves? Any help here would be appreciated.
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Post by bjg on Apr 9, 2014 11:55:09 GMT -5
 In the picture, if you look at the green line I've drawn you can see a hole in the sprocket just barely showing. On mine I can see the entire hole for all three holes through the sprocket. I'm thinking the silver guide on top of the sprocket is misaligned. If that is the case, is it ok to loosen the bolt in the center of the sprocket and shift it? I'm new to this so any help would be appreciated. |
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Post by richardthescooter1 on Apr 9, 2014 12:13:17 GMT -5
Above the oil fill there is an arrow on right and notch on left as you turn you will see it  |
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Post by bjg on Apr 9, 2014 12:19:30 GMT -5
I can see that one but the guide says to align the marks in the picture above and the one in the port above the oil fill to ensure you are tdc.
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Post by richardthescooter1 on Apr 9, 2014 12:47:12 GMT -5
That's right, it will take few turn to be TDC, (for both to line up) it can be tricky. it works good if you have someone watching the oil side, if not use a mirror if you have one you can position it so you can see when turning the sprocket and I use a magic marker to mark the notch on the sprocket housing so I can see the mark as I turn my sprocket.
Plus you want to move slow as you approach those marks, or the compression will push it pass the mark.
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Post by bjg on Apr 9, 2014 12:51:58 GMT -5
My problem is that I can't see the one in the picture above to line it up. I think it's hidden by the silver plate on top of the sprocket. The picture is from the guide and not what I see on my engine. I was saying I can see the hole that goes through the sprocket entirely where you can only see a little bit of the hole through the sprocket in the picture above.
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Post by richardthescooter1 on Apr 9, 2014 12:53:50 GMT -5
I know mine is off a little too, us a flashlight and try to find the mark. I don't know if you hold the nut with a wrench if the back plate would move?
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