YZ Cam Timing
Posted January 13, 2007 - 09:42 AM
Just been in to check the valve clearances and found what I suspect to be YZ cam timing mod has been done. However, when I set the flywheel to TDC (with the lobes facing away from each other) the inlet cam mark is about 2mm below the cylinder head / cam cover joint face. Is this likely to cause a problem?
I have attached some pics, one shot from a higher angle to show the dot on the inlet cam and one shot from level with the joint face, where the dot cannot be seen.
There is 12 pins between the camshaft marks along the top chain run.
The TDC mark I am using is nthe I mark which is about 10mm after the H mark on the flywheel so I believe to be the correct mark.
The bike runs okay, but I use only for Enduro, mostly low and mid range work - will the bike be better if put back to standard WR timing for my riding?
The bike has completely standard exhaust and airbox cover. I don't believe the UK buikes have the grey wire? Please advise.
Anyway, I would appreciate your comments, and will leave the bike disassembled until I get some feedback.
P.S. When I click to add picture it asks for a URL? How do I attach pictures please
Posted January 13, 2007 - 01:53 PM
Thanks for responding.............
I was led to believe the bike was 1999, but when I bought rear pads the '98 ones fitted, so guess probably 1998
Posted January 13, 2007 - 02:05 PM
Posted January 13, 2007 - 02:07 PM
Posted January 13, 2007 - 03:08 PM
I'm certain it is YZ timing, just concerned that the inlet cam TDC mark is slightly below the joint face when crank at TDC, ie the inlet timing is retarded.
Is this a big issue or fairly normal?
I will check the tensioner tomorrow.
The chain does not seem overly taught between the cam sprockets, I wonder if the tensioner is a bit lazy, or if the chain might be stretched.
If antone knows how I can post photos this would make clear
Posted January 14, 2007 - 08:25 AM
So from these, can anyone suggest why the inlet sprocket does not align when the crank is at TDC? Could it be the sprocket has slipped on the camshaft?
Or is it more likely problem with tensioner or chain?
Posted January 14, 2007 - 08:38 AM
On second thought, if timed per yz the dots will not align. I'm as confused as you.
Posted January 15, 2007 - 04:57 PM
Posted January 15, 2007 - 05:02 PM