You need at least 100 rpm, fuel, air, compression and heat to start these babies. If one isn't right then no start. Check each conditions and make sure you have them. IE pull the hard line to see if fuel is actually going to the engine, check the voltage of the battery while cranking, check the air cleaner ect. If everything is right it will start.

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C