Main rotor stop spinning at idle in second flight

Hi
I had a crash and I replace the
Main shaft, spindles, Main Blades & Gearbox.
I also check the engine/clutches and the seem to be ok.

Now every time I go to flying at the first flight everything work ok
In second flight the main rotor not spinning in idle
And need more power until he starts spinning(hover power)
i used byron full 30%

Any Idea????

the main rotor not spinning at idle is normal and a good thing,
aspecialy when doing autorotation ypou dont want the clutch to be engaged.when you crashed the engine probably was still running fairly fast and the clutch lining probably got burnt up a little wich means its thinner now so you need more power for it to engage. if you engage at 25% throttle then dont worry but if at 50% then you should change clutch linner.