Cam Chain Pin

My 08 YZ450F has become really hard to start after only about 15 hours on the engine. I have never done a top end inspection but I thought I should give it a go. I have pulled it all apart to get the valve cover off and I have lined up the marks to TDC but i am unsure where I start counting the pins on the Cam chain to make sure there are 13 & it is all in sync. I have read the some of the articles but I thought it couldn't hurt to ask anyway. I have posted a picture below, any help would be great.

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