Dave,
Many of us with 404's do the 'civilian' conversion to unshielded plugs and spark cables, and also put in a Petronix ignition. I had continuing point problems before the Petronix upgrade. My guess would be bad points, and that's so easy to check. Just take off the dissy cap, set the dissy cam on a lobe (in 6th gear, manually bump/rock the truck to move the dissy shaft..) and check out the point gap...but you know all that. The engine will run with huge variation in point gap but it'll only run well with the right gap and dwell. You can set dwell and timing with 12 volt testers if you run them off a separate 12 v battery. Just make a common ground connection.
You should get on the Unimog forums. These mods are well covered.
http://tx4x4.com/mailman/listinfo/mog_tx4x4.com
http://www.benzworld.org/forums/unimog/
Bob
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1952 M-38
LST-178 Lube and Service Trailer
M-105A2 trailer, bare
M-105A2 with sides, bows
'old' Onan 115 v radar power generator, 4 cyl opposed
2 x S-250 Shelter, 318 shelter
1957 Unimog 404 flatbed, French NATO (Germany)
1965 Unimog 404 radio truck (German Army)
1970 Unimog 406
1978 Unimog 406
1982 Unimog 406
1988 Unimog U-1300L MIL contract, Fire Service life (red over OD paint)
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