2012 KX250F timing chain marks off??? Help please!

Old Oct 27, 2024 | 02:35 AM
  #1  
Jeepjayjeep's Avatar
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Default 2012 KX250F timing chain marks off??? Help please!

Need help,
just did valves and timing off on chain to sprocket??? It does not match the picture. Where my mark lies on left it is in between the outer chain piece. The manual says it starts in the middle??? Stretched chain? Off on the bottom sprocket by a turn? Please help I’m stuck! Lol


 
Old Oct 27, 2024 | 02:36 PM
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Don't worry about where the chain is. That is irrelevant. The only reason why they have any chain link labeling is to give a short cut to setting up the intake cam easier. They are indicating pins not link plates, it is a pin count.

When it comes to cam timing, it is the punch mark positions in relation to TDC and alignment with the head. The chain has no beginning and no end, every link is like every other link, so it doesn't matter how the links set up on the chain, other than fitting the sprockets of course. It only matters that you have the engine crank shaft at proper position and that those marks line up per the manual on the exhaust and intake sprockets.

In other words you have it right for the exhaust cam, now how about the intake cam?
 
Old Oct 27, 2024 | 03:23 PM
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Hello, thanks for your quick response. It’s been driving me nuts. The first time I shimmed the valves I had the first pin on the right spot. I take good. What caused it to be off now? My chain stretched? Should I be concerned about it? Bugging me bad. The manual states to strain the exhaust, so pull… do I pull down (camshaft rotate counter clockwise) or strain to the right (clockwise as the tensioner will pull the chain right)? Just trying to do it right this time.. learning as I go, thanks again for any input!

Jason
 
Old Oct 28, 2024 | 11:25 AM
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All I see is that you are apparently looking a the cam chain plate, not the actual pin. the chain is one tooth different from the picture in the manual, but the cam position - the important part - is in proper position. Ignore whether the side plate matches the picture or not. It doesn't matter. Look at the manual, it is pointing at the pin, not the side plate. They are showing you count from pin A, the pin, not the side plate, around 28 pins (apparently pin C that is cut off in your picture) to know where to position the intake cam. The side plates don't mean a thing. the pins that go through the plates do. And your picture looks just like the manual, when it comes to the pins and the cam sprocket timing punch marks in alignment with the horizontal surface of the head. Yours just has the inner plate at that tooth where the manual has the outer plate at that tooth, no difference in timing and no functional difference what so ever.

To pull the cam drive tight the exhaust cam is pulled clockwise to pull on the front run of the cam chain. Your crank should be at the TDC mark and the exhaust cam should be lined up exactly as yours is. Can't see the intake cam, so no idea if you have that one positioned properly. If the marks line up per the manual you are good to go.

.



 
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