I have a execu indoor helicopter. the problem is the one roter does not want to spin fast enough. and there is alot of heavy vibration .

If there are two blades that turn in opposite directions, perhaps the blades are reversed. If that is the case then they are pushing the helicopter down instead of up.

Check the shocks on the drum to make sure they are ok. if they wear out the drum spins out of balance and the computer wont allow it spine because it would WALK and damage itself.

I used these and just cut them down to the correct diameter http://www.ebay.com.au/itm/E-Flight-503-RC-2-4ghz-4-Ch-Micro-Helicopter-Blade-Set-503-f004-/400295947176?_trksid=p3286.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D4
%26po%3DLVI%26ps%3D63%26clkid%3D334894282496216441&_qi=RTM839190#ht_2040wt_905

I too had the lift-off prolem and I fixed it by gently pushed the upper gear all the way up, using a nail through the bottom of the copter and a hole in the lower gear, while pushing the lower rotor down.

make sure the tail motor does not have any hair stuck in it take of the little propeller and clean it.
next adjust the trim so when your taking off so helicopter will not spin any more and your good to go

the cause of this issue is hair or something preventing the tail rotor to spin properly.. i had this issue and checked mine over very good, noticed the hair in tail rotor, and then took a needle to fish IT ALL out.. if u dont get it all.. it wont trim properly cause it cant spin fast enough

Spinning is caused by one of the main propellers rotating faster than the other. If both propellers are secured tightly to their drive shafts, the spin control knob on the remote control can be used to stop the spin. However, if one prop is slipping with respect to the other, the spin control knob will not fix the problem.
I've found that the set screws holding the propellers to the drive shafts tend to loosen after a while. If one prop is a bit loose and the other is tight, the relative slippage will cause the helicopter to spin.
To check, turn off helicopter power and manually rotate each propeller separately, watching the nylon gears in the body. If the propeller is moving and its drive shaft gear isn't, the propeller is slipping because its set screws are not applying enough pressure on the propeller's drive shaft.
Carefully tighten the set screw and the problem should be fixed. DON'T OVERTIGHTEN, or the plastic threads for the set screw will be stripped and the propeller assembly will be ruined.

make sure there is no debris such as hair thread or string caught in the back rotor. this will cause it to lock up. Remove it and try fiddling with the trimmer button to help it stop spinning the helicopter

I just found out that the feel of my pedestal came loose causing the back of the washer to be higher than the front. I don't know if yours is the same, but mine has sounded like a helicopter taking off. I screwed the back feet back in.

I've not yet uprighted the washer to find out if it's resolved--I need the heavy-lifting members of my household for that--but I do hope this will return the washer to a far more normal sound.

looking from the above top roters should rotate anticlockwise bottom roters should rotate clockwise also check blades are fitted right way round. I only sugest this because you have replaced the 4 in 1 and could have put on connections wrong wa round easy mistake good luck