2 stroke gas engines don't have valves like you are probably thinking (reed, rotary, or the piston itself are the valves), however 2 stroke diesels all do, to the best of my knowledge. As mentioned before, the valves are all exhaust, as the air is brought into the cylinder through "holes", or ports, part way up the cylinder wall. If you've ever seen a chainsaw engine apart, you'd have a good idea what this is similar to.

2 stroke gas use oil in the gas or injected oil for crank/cylinder lube, 2 stroke diesels use engine oil like any other diesel.

2 stroke gas typically are naturally asperated (I have heard of race turbo'ed engines), 2 stroke diesel have to be force inducted (supercharged) to run.

Same name, similar concept, much different excecution.

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1991 GMC Sonoma Ext Cab w/Isuzu diesel (converted March Mar 2003) - sold
1994 S10 Ext Cab w/Isuzu diesel (converted Mar 2008)
1998 Toyota Sienna XLE
B6100HST Kubota CUT DIESEL

1994 S10 with Isuzu diesel and 5spd
http://img.photobucket.com/albums/v6...S15/SigPic.jpg