Hesitation at wot help

[dogmam]

100 psi on that engine sounds Low. I would redo the Compression Test with a different Gauge. Don't start sanding the Reeds, as that will result in you needing to find Replacements. They are Check Valves, and if there is a slight gap at rest will, 99.999+% of the time, will seal when crankcase pressure rises.
Can the Spark, jump a 3/8" Gap, on all Cylinders?
When you rebuilt the Carbs, did you use genuine Mercury/Quicksilver Parts?
How did you check/adjust the Float Levels?
A Serial Number would be nice, as there are 4 Groups of Serial #s for the XR6 and there are variations of the Carbs between them, and even within them.
It appears some have non adjustable Idle Mixture Circuits.
When you did the Link & Sync, where did you get the Specs for it?

I had a mechanic look at it first he said compression was fine ser#OT589198 for the link and sync i got off YouTube and the then the manual and yes I use quick silver parts all choke plates are closed

 

[Chris1956]

At this point, I think you need to look at the ign system. A lot of Mercs use high and low speed windings on the stator. The transition between the two may be causing your issue, but it is a guess.

That electrical device from your post 17 is a voltage regulator. You might disconnect it from the stator, to rule out it being an issue.

 

[racerone]

Run with a timing light , 1 cylinder at a time.----Observe the light when motor falters.

 

[dogmam]

Run with a timing light , 1 cylinder at a time.----Observe the light when motor falters.

thanks i will give it a try