Did the conversion on my SD. This may help you understand a little better what is involved.

http://www.peachparts.com/Wikka/OM617CalToFed

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R