Thanks Bruce, that explains why the old stretched chain kept on sliding off.

Thanks Rolla for comments. They are great mowers, well designed and is a good size for my lawn. It's the main reason why I haven't upgraded in size.

Thanks again Deejay for your help!

After finally setting/adjusting it today. I started it up and what a amazing difference. So much more torque and acceleration. It use to struggle cutting when going up a hill. The other positive is that I dont need to over stress the engine to make it cut and move. I can see myself cutting my lawn twice a week now just so I can use it... lol