This is the "best" picture I have of a cam timing belt sprocket. Note the two marks. 60A (in the yellow section) is the one for G16 motors. Then about 4:30 is an "80C". I have been told this is for a twin cam motor. But you can see how it can be improperly installed, making the "80C" the "correct" mark.
Why the odd colors? I do not have a picture of the completed paint job, but it now has yellow and black at the #4 position and a blue/white at the #1 position. I painted the sprocket so I could check the timing with the cover still on. Here it is sitting at TDC #1 ready to fire. (Positioned to install the distributor.)
This next picture is one of several reasons why:
If you look closely you will notice the small notch for TDC is no longer lined up with the key-way slot on the crank. The outer ring has shifted a few degrees from the center, making the timing mark inaccurate. This is the only Suzuki harmonic balancer I have seen that has shifted. I have seen some older, 70's GM balancers almost 180 degrees out!
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