Been dealing with the dreaded off-idle bog with my WR450f. Currently running the JD jet kit #168/red-4 needle, #48 pilot, #60 leak jet, & thick o-ring. The previous owner was running the GTYR kit & needle. Never checked the pilot air jet. Going to pull the subframe tonight to take a closer look & film the squirt, but I had a few questions that are still unanswered after searching the depths of the forum.
1. The 08 CRF450 apump kit. I know the diaphragm has a shorter pin. What other improvements does it have and how do they help? Do these bikes need a longer acceleration pump squirt? I remember when tuning my old 01 WR250F, the target range was 0.5-1 second - what's the target duration for the 450s?
2. If the gap between the AP set screw and AP link lever/throttle linkage at WOT is eliminated, is there a disadvantage to using safety wire vs buying the stiffer Merge AP spring?
3. The pilot air jet. Stock 07 WR450F's come with a 70. Stock 07 YZ450F's come with a 100. The 07 Yamaha GTYR AIS removal kit came with a 110. Which PAJ is the best to run, and how will it affect the pilot jet & fuel screw setting to run? Does the GTYR AIS removal kit involve disabling the air cut valve (ACV) as well?
Most rides I do are 1000-5000 feet, 55-85 F.