I also thought that was "flush" thanks for the clarification. We have a club race this coming Saturday, will do this modification. I have always tuned the engine with the LHS technician (since i bought it from them), but since yesterday race (Futaba Cup) i can't bother him cause he also joined the race. That was my bad since i did not even learned by myself to tune this engine. I'm a complete noob with engine tuning. I already have around 4 gallons on this engine.

Ok so after setting .7mm to 1mm in the idle gap, flushing the HSN and LSN. Turn .5 in HSN and 2.5 in LSN. Engine running, what's the worst that could possibly go wrong? will inform here once i had it tested.

Thanks,