I got a new powerbloc for my pilot and it can already assembled with 12 weights and that made it run like crap so eventaully I got my self up to the max of 15 and it runs great at that. Is that unusual?

Amount of pucks determines engagement rpms that's pretty much it. Please explain in greater detail the performance your describing. It might be another issue.
I have never used that many usually for my pilots with a overbore, carb, reeds, cool head compression around 160 or so I go with 12 pucks engage rpm usually around 3800 to 4000 on my tach. Is your clutch a HRD?

Okay well when I started off with 12 weights the had no top end power and whenever I would rev it up it would go then as you were driving and the Rpms got lower like 1/4 throttle just putting it around it Would like catch it self if that makes any sense. Then I added 14 weights in each (added 2) and I ran 100% better the catching it self at low throttle. Went away and it had tons of top and bottom end, so just for the hell of it I added one more and that's where I just got my best overall performance. I did notice that the machine just seems to rev more before it engages, from12-15 weights. Is that just how they run.?

The pilot is bone stock.
81mm bore
Newer belts like last summer (like 10hrs max)

Pilot belt well within spec

Mud,it's the spring that mainly determines engagement.

Just been going thru my ol notes when I had my Pilot's with Powerblocs.
I'll keep posting up here what and when I find.

Powerbloc Pulley adjustments

Engine SPEED UPON ACCELERATION :
For more competitive performance, or better fuel economy, the user may increase or reduce Engine acceleration speed. The weights in the three Blocks determine Engine speed.

The lighter the Blocks, the higher Engine RPM. By and large, adding a # X-81-3 (3.4 grams) Weight to each of the 3 Blocks reduces Engine speed by 100 RPM. The opposite is true if one wishes to increase Engine speed. This effect is cumulative if one adds or removes many Weights.

To ensure proper Pulley equilibrium, the three Blocks must contain precisely the same number of Weights.

SPEED UPON ENGAGEMENT :
Though Block weight has a direct effect upon the Engine RPM at which the vehicle starts moving, it is mainly the choice of Spring that determines Pulley speed engagement. There exists a wide selection of Springs for the Powerbloc family of Pulleys.

Powerbloc Pulleys are pre-calibrated in plant, thereby offering an engagement speed that satisfies most users. However, engagement speed may be modified by changing the Spring. A lighter Spring will lower the engagement speed, thereby allowing for smoother starts and improved vehicle control at very low speed. Inversely, a heavier Spring will produce starts which are more abrupt and competitive.

Just to add to this,it's advisable to weigh each component,puckblocks,disc weights etc.
I have found some big discrepencies in individual weights.NEVER ASSUME!
Get yaself some digital scales,weight each seperate piece and put in 3 piles.
1st pile put the underweighted ones.
2nd pile the correct weights.
3rd pile the overweight ones.
By using underweight with overweight etc

This way you mix and matchup the diff weights to end up with 3 totally assembled block/weights that are even/same weight.

On my Pilot800,I bought a NEW set of 10-64 Polaris flyweights.
1 was correct weight at 64g,one was underweight by a small amount,and one was a porker 0.5g overweight.
I weighted these because of what I learned with the Powerblocs and many more components to affect the system.
The blocks over time wear and get damaged and inturn change their own weights.
Mark the blocks with their weight,so you can see over time how they change from original.

Found some more stuff.

I have the stock black spring now, I might need a lighter spring for lower engagement

Yes a lighter spring will give lower engagement,then retune your weight discs.
Can you get hold of a spring tester?
If so check your spring at engagement and full shift dimensions.
Then you'll have a record of what and how it all works with eachother.

Everything is brand spanning new, never been run but once or twice around the yard? Is a spring test still neccesary.? And where would I get a new lighter one .?

Not necessary IF you already know the engagement/full shift dimensions.
It's just good to know IF you want to make future changes in engagement or shift ratios.
Your current specs NOW will give you a base/reference point for the future.
Will also give you history specs so that you can see if they're wearing out/going outa spec with use/time.

sorry for the wrong information. I assumed your spring color.

Sorry?...SORRY???...You will be IF it happens again...,twice now!
Happy New Year.

I once had a wife like that!

Do I just go back to ATV racing for the lighter springs.?

You da man Bug!

Thanks for the info, had no idea they made that many springs!