last night i put in new clutch shoes and springs (mugen aluminum ones)

It seems now.. that i can sort of rev the engine before they will engage.. the old ones were real easy to move up and down.. and these alum. ones i can barely lift up with my fingers.l.. not sure if i actually did..

But i ran it for a small bit today, and cant figure out if its something i did.. or if it really is just how strong those shoes/springs are...

But when i get up enough rpm's and it catches, the thing FLY"S off.. i mean it will just take off and pop up the wheels with no problem if i do it right..

So im thinking its normal for it to be tough to engage?