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Yeah... I still have an OS in rotation, the 21TM in one of my revos. Still a great little engine and holds a solid tune all day long. Wish they were all like that.... grumble stupid lrp 30 grumble...

I had one many years ago. Was a good little engine. I ran it in an old HPI Nitro MT, which was a single speed 1/10th offroad truck. The truck was fragile, but the engine was very solid. Tuned easy and ran very well. Was a far cry from the original hpi 15 that was in there. I had a few OS 15...

Looks like according to the manual for the slide carb version: http://manuals.hobbico.com/osm/18cvr-rx-manual.pdf LSN seat is 1.5 turns in from flush with the housing HSN is 2 turns from all the way in Found this for rotary carb version...