Suzuki DT40 number 1 cylinder

I have an 88 DT40 that has a rough idle and up to 1800 rpm. After that it will run like brand new. With me, 8 gallons of fuel,tool box,lunch,tackle box,fishing gear, 2 batteries,and a partridge in a pear tree, it will push my Bass Tracker 17 about 30 mph GPS. I rebuilt the carb, replaced the idle air screw, new fuel pump, new plugs, and static timed it according to my manual. I want to check the timing with a light but cant find anywhere that states which cylinder is number 1. Anyone know? Thanks.

Top cylinder is always #1.

Thanks,Pappy. I appreciate the response.