Hi, Wonder if anyone good give me some advice, Will be fitting a Pinasco 177 kit soon and have recently cut/removed the small end brass bushing out of the con rod. On fitting the new small end needle bearing i noticed if fits the gudgeon pin fine but when inserted in the con rod the bearing seems to slide through fairly easy. I thought the inner piston sides would stop the bearing creeping out of the con rod but it does'nt and the amount of travel can make the bearing creep out the con rod nearly half way.
So my question is do i need a wider needle bearing to take up the slack ? Using a 15x19x20 bearing at the moment.
or will an oversize standard bearing be tight in the con rod enough so it can't creep out of the con rod along gudgeon pin ?
How much movement / play is allowed ?