I bought another OS .61 SF, no box though. how do i tell if it's an abc vs ringed?

david

look inside the exaust port; if you see a small band around the top of the piston about 1/16 in thick, that is the ring. If you see the same material top to bottom of the piston it is ABC.

The ABC engine also has a line at the top edge of the piston but the ringed engine band is wider.

i'll take a look.

If it's ringed, and you need to get a new one, you can get it, shipping included, for $13 from:

Frank Bowman

1211 N Allen Ave. Farmington, N.M. 87401-3568

505-327-0696

ringmaster46 ~ at ~ msn.com

Finding a new ABC liner/piston set will be time consuming and pricey.[]

David

either way it is in almost new condition. it came with a nice balanced spinner and 2 mufflers. not bad for $80.

david

it appears to be ringed. the 'band' or ring at the top is about 1/16" thick.

david

I took some photos in case anyone reading this thread wants to see the difference.

The left photo is ringed, and the right one is ABN

David

thanks david. my understanding of everyone's description was correct. the sf is ringed. i know now that a couple of rf's i have are ABC. i bought them not knowing.

david