power falling off 5th

[burleybanshee]

Quick run down. Pismo all last week. Dragging the motor ran hard 1-3th, then top 4th and 5th at full power it would act like running out of fuel. Disconnected fuel lines, flowing plenty of fuel for the 30mm oko's. Got a 4mil/5mil rod, .20 over 795's, t5, vf2, mild dune port +4, 165 psi, 15-41 gearing, +4 swinger, 21X12x8 haulers, 240 pound rider.

 

Pulled plugs were little black wet. went from 165 down to 162, still wet. Went down to 158, no longer wet but now at full throttle at top of rpm's per gear felt like it was missing or not firing all the time. Top rpm power per gear felt not as hard didn't pull like it did when it was richer. Went to 160 jet, felt same way, a little better. Do I need to get diffent iginition like adjustable timing or is it just falling off to quick with the t5's? Do I need bigger carbs? Should I go down to a 14tooth front gear. Am I putting to much of a load on the engine with my weight and the 15 tooth up front for it to keeping pulling and climbing in rpm's? in 4th 5th gears.

 

When it had the 162 mains, it pulled like a freight train through 1-3 gear and half way through fourth.

 

Help. I know a lot of questions?