Connecting rod clearances and play?

GoldenMotor.com

Technocyclist

Motorized Bicycle Senior Technologist
Jul 7, 2008
462
0
0
Asia
I've disassmbled one of my HT motors, and I noticed that there is a lot of play on the connecting rod. I don't know if the connecting rod should shake like this. But maybe, it's one of the many reasons that the engine vibrates so much. All the needle bearings are still intact, but I'm not really comfortable with this much play and clearance. So, is this amount of play and clearance on the connecting rod really necessary?

Can the amount of play and clearance be restricted? if yes, then by how much?

I've had some R/C engines before, and it does not have this much play and clearance.

So, is anybody there who can enlighten me on the mystical clearances and amount of play on the connecting rod of the HT engine?