HI martysmartie... Thanks for respond me..

I go & time the engine again.. with all arrows/etc correctly..
i start it again & work succesfull without knocking noise..
i have the valve pockets in my pistons..

But i dont know why it lose the timing.. last sunday i park it in the garage in good niose & no knockings. my first start is yesterday & start with lose timing..

I use a Graham Goode belt.. & i always found a little bits of rubber with my pulleys cam after a ride & few very rare with the pulley dizzy... & i dont know if has, with the crank pulley , cause i can`t see it..

Thanks soo muchh