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Old 04-24-2012, 02:20 AM   #1
Sumi OP
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No marks on rear cams?! 950ADV

Hi!

Yesterday I've done a valve check, and noticed that there are no "X" or "+" marks on the rear cylinder cams.. So I've turned the engine to TDC, locked it with the locking tool, and measured the clearances that way (so I've assumed that the dealer who fited the cams previously set the cams correctly) + marked the teeth with a marker pen.

The problem is that 3k miles before, the dealer replaced my rear cams with new ones, and I don't understand how did he know the good position for the new cams without the marks (there are no "O" marks on the outside at TDC as well).. Maybe he counted the teeth on the old cams and used that to compare it?

Because the bike is running rough at idle (hunting + sudden death), I'm thinking that one or both of the rear cams may be off one (or more) tooth?

Bike starts easily, and pulls fine, but I just can't see how to set the cams properly without the marks on them.

Has anybody seen this before?

Thanks for your ideas!
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Old 04-24-2012, 03:49 AM   #2
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Was quite some time since I checked mine.

But think you might have to look for marks on the other side.

Try getting hold of a service manual, provide us with an email and I'm sure someone can help with that, at work right now so can't send anything until this evening.

/Johan
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Old 04-24-2012, 04:33 AM   #3
Sumi OP
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Quote:
Originally Posted by Dirty950 View Post
Was quite some time since I checked mine.

But think you might have to look for marks on the other side.

Try getting hold of a service manual, provide us with an email and I'm sure someone can help with that, at work right now so can't send anything until this evening.

/Johan
I have the service manual..

There are no marks on the inside of the cam (looking from the ignition cover). Not an X or a + or a circle, nothing.

There are however marks on the outside of the cam (Circles) - but they are way too off for them to be good. (cams are marked "RE" ofcourse)
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Old 04-24-2012, 05:06 AM   #4
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Could it be that the dealer put in some 990 cams?
The markings are different.


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Old 04-24-2012, 05:09 AM   #5
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No, because the cams are not black (or dark grey), like the ones used in the 990s
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Old 04-24-2012, 11:46 PM   #6
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No, because the cams are not black (or dark grey), like the ones used in the 990s
My (bought from new) SE, has black cams stock.
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Old 04-25-2012, 05:37 AM   #7
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My (bought from new) SE, has black cams stock.
But I've never seen a "not black" 990 cam.
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Old 04-25-2012, 06:08 AM   #8
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But I've never seen a "not black" 990 cam.
My SE is 950
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Old 04-24-2012, 07:11 AM   #9
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From the ktm950.info:

The other side (engine side) of the rear cylinder intake cam gear has the "X" mark indicating the proper position at TDC of the compression stroke.



/Johan
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Old 04-24-2012, 11:04 AM   #10
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Quote:
Originally Posted by Dirty950 View Post
From the ktm950.info:

The other side (engine side) of the rear cylinder intake cam gear has the "X" mark indicating the proper position at TDC of the compression stroke.



/Johan
Yes, that's what I've wrote in #3 .. That there are no "X" or "+" on the inside (engine side, ignition side, etc.) on the cams.. That's why I've created this thread:)
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Old 04-24-2012, 11:23 AM   #11
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Quote:
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Yes, that's what I've wrote in #3 .. That there are no "X" or "+" on the inside (engine side, ignition side, etc.) on the cams.. That's why I've created this thread:)
Hmmn. The rear is a "+" mark and it's below the V between two teeth (the front is an X on one of the teeth).

With the cam bridges in place it's much harder to see than the front, I usually rotate a few degrees past TDC until it comes into view and they go back.

I'm assuming your rear cam is approximately corectly positioned, pointing towards 10am if you are looking from the left side of the bike.

Pic from the HOW (with cam bridges removed):

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Old 04-24-2012, 11:28 AM   #12
Sumi OP
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Okay..

To be clear:

Even if I take out the rear cams of the cylinder head, and examine them when they are in my hands -> There are _NO_ marks on the inside (lobe side) of the rear cams. Not a single cross, or plus, or dot, or circle, nothing at all. nothing..

I know how they should look like as the old cams in the front cylinder head have these marks.. Also my old, shot cams which have been replaced and are now laying in a box on the shelf have the "X" and "+" on them.. It's just that these new cams that has been changed last year doesn't have any marks on them..
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Old 04-24-2012, 11:34 AM   #13
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Quote:
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Okay..

To be clear:

Even if I take out the rear cams of the cylinder head, and examine them when they are in my hands -> There are _NO_ marks on the inside (lobe side) of the rear cams. Not a single cross, or plus, or dot, or circle, nothing at all. nothing..
When I wrote above I was certainly aware of possibility that you knew what you were doing

Sounds like you need to talk to the dealer. Ask them a) how they correctly timed them when they installed b) how you are supposed to adjust the valves.

I'd be making a case that they need replacing as otherwise you cannot perform an accurate valve adjustment.
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