TunnelBill

My Feedback: (58)

Hi Dave,

I took my YS 63 FS a part to change the bearings. Do you have any tricks to get the cam bearings out that are rusted and Stuck, I have tried every trick I have and they are still stuck. I am not sure how to set the timing when I put the cam back in the motor. I see a Dot on the cam, is that TDC when the piston is TDC? Sorry, this is my first 4 stroke rebuild, I have done a bunch of 2 stroke motors.

Dave Shadel

You'll need a slide hammer puller to get the inner cam bearing out easily. You can try heating the case slightly with a torch in the area of the bearing and reaching in with a hemostat, but a slide hammer is easier. You have to make it, the local hardware store won't have one.

The dot at 12, the piston at 12. Easy.

Good Luck!

TunnelBill

My Feedback: (58)

Dave,

Thank you for the info. Can you tell me if I sould have my piston ported or I have read about work to the piston on the 63 motor. I have the motor a part, is this something I can do at home?

Thanks,
Bill Bigelow

Dave Shadel

If you have a 63S it already has a gas ported piston.

TunnelBill

My Feedback: (58)

Dave,

I have 2 63FZ Motors......

Bill

Dave Shadel

Does the piston have either 4 notches or 4 holes through the piston crown?

TunnelBill

My Feedback: (58)

Dave,

They have 4 notches on the face of the piston above the ring. Is this piston already done?

Thank you,
Bill

Dave Shadel

Yes, it is.