I got my clutch problem fixed today, with an unexpected solution.
I first continue break-in my Picco XP .12 5ports with 10% fuel. Than trying to do some break-in run over the track. However, even with clutch rebuilded, the problem still exist. Replacing new flyweight, no work. And the shop doesn't have yellow shoe to try with. Still in the same trouble with last week...
But since my new engine is almost ready, I decide to change fuel with 25%, add .20mm shim into engine, reset fuel pin. Drop the car into track see IF it works. Suddenly, the clutch problem gone...
So the solution is: replace 10% fuel with 25% fuel.
I don't know how it could happen like this. The RPM is about the same, but with 10% fuel the clutch dis-engage all the time. However, with 25% fuel it work perfectly (a little bit too loose, gonna loose the spring next time). The only possible explanation I can find is using 25% fuel let engine do more torque under same RPM, keep the clutch engage correctly.
Now the clutch problem fix. New problem is: I break my front damper during a minor crash (very slow speed). S710 is much more fragile than I thought. Even super-harden bumper can't save my damper in minor crash. Both top and lower joint-cup are gone (thank god the damper rod still good)
I guess added 1mm shim in lower damper joint-ball is not enough to freeup front damper to avoid damage during crash. Seems I need to do upper joint-cup cutting suggested here (http://www.daltonshop.com/tips_tricks.htm
) on my new damper.