Use the video that was posted by All Day Dan for checking the timing . Be sure that the throttle is wide open when checking the timing that way it wil be at max advance. To adjust the timing on the Brison adjust the length of the linkage that goes to the timing ring . I would set the timing at 30 degrees before TDC at wide open throttle . It doesnt matter what the idle timing is at this point . Get a new plug and gap it at .020 . Set the needles initialy at 1 -1/2 turns open each.
1)Start the engine and let it warm up for a few minutes

2)If it won't idle then lean the low needle only enough to get a steady idle that doesn't load up .

3)Run up to wide open throttle a few times to check throttle response if it stumbles lean the low needle a little more .

4)After warming the engine some more open to WOT and adjust the High needle to max rpms period . NO more No less ,Max PRM . This is where a tach is your friend.
Make adjustments slowly and in small movements the width of the screw driver blade at a time and allow 10 to 20 seconds for the adjustment to settle in.

5)Once the High needle is set rturn to idle and start leaning the low needle gradualy untill the engine does not respond to throttling up then start richening the low needle in small movements only enough to get a good throttle responce . There is no need to go any richer on the low needle than what is needed for throttle response.

6)After the low is set only rich enough for throttle response Go WOT again and set high needle for max rpms again using a tach ,again no richer than Max RPM's.

7) Reduce throttle to the point where the mid range is at its roughest (usualy about 1/3 to 1/2 throttle . Lean low needle only enough to slightly smooth out mid range roughness but maintain good throttle response (you cant get rid of all of it)

8) Go WOT and again set High needle for Max Rpm one last time