Just my opinion, but the ring would be the last thing I would try. Other opinions may vary. I get my carb kits from the local yard equipment dealers. My 10 year old wore out ryobi still did great at 6700rpm on TF 18x8. At least until it hit the power lines. I though it was shot out of the air. Bent the crank on that one, but I have 5 more in storage and one waiting for a plane.
Edwin