Outer Limits 4x4 Board

i think the timing on my gq tb42 is out it is starting to run a bit ruff and is running on wen i turn it off and has stoped running on petrol wat is the best spot to set me timming to so i can get the best out of it. cheers

factory spec is around 10 to 12 deg advance, i run mine at 15, but start at 10 and see how you go