Ringed motor question...
 

Motor in question: OS SF 46, ringed 2-stroke. Shouldn't there be a pin in the piston's ring groove to keep the ring's gap from hanging up in a port?
I know outboard motors have them for this purpose, but I could be comparing apples to oranges.
I'm new to rc motors, so let the education begin! Thanks in advance for any info.

RE: Ringed motor question...
 

The K&B doesn't have a pinned ring. But It does have port dividers.

Enjoy,

Jim

RE: Ringed motor question...
 

Some engines have them and some don't. It all depends on how wide the ports are in relation to the cylinder bore. The ringed OS engines have a "bridge" across their exhaust ports and don't have any real problems with snagging ring ends. Their transfer ports are fairly narrow as well.

RE: Ringed motor question...
 

My OS .46 SF engines do have pinned rings.
Dave