In Washington, it doesn't matter what the title or MCO says. Beginning Jan 1 2012 (or maybe 13) if you can make it "meet safety standards" in terms of lighting and reflectors, and get it inspected and signed off by an authorized dealer or WSP you can register and plate it. If it doesn't have a title or VIN (homebuilt) they will assign a VIN and title to it.
http://licensingexpress.wordpress.com/2011/12/16/converting-off-road-motorcycles-for-street-use-becomes-legal-in-january/
Here are the requirements
(a) Files a motorcycle highway use declaration, as provided under
2 section 3 of this act, with the department certifying conformance with
3 all applicable federal motor vehicle safety standards and state
4 standards;
5 (b) Obtains and has in full force and effect a current and proper
6 ORV registration or temporary ORV use permit under chapter 46.09 RCW;
7 and
8 (c) Obtains a valid driver's license and motorcycle endorsement
9 issued to Washington residents in compliance with chapter 46.20 RCW for
10 a motorcycle.
11 (2) Any off-road motorcycle operated under this section must have:
12 (a) A head lamp meeting the requirements of RCW 46.37.523 and
13 46.37.524, and used in accordance with RCW 46.37.522;
14 (b) A tail lamp meeting the requirements of RCW 46.37.525;
15 (c) A stop lamp meeting the requirements of RCW 46.37.525;
16 (d) Reflectors meeting the requirements of RCW 46.37.525;
17 (e) Brakes meeting the requirements of RCW 46.37.527, 46.37.528,
18 and 46.37.529;
19 (f) A mirror on both the left and right handlebar meeting the
20 requirements of RCW 46.37.530;
21 (g) A windshield meeting the requirements of RCW 46.37.530, unless
22 the driver wears glasses, goggles, or a face shield while operating the
23 motorcycle, of a type conforming to rules adopted by the state patrol;
24 (h) A horn or warning device meeting the requirements of RCW
25 46.37.380;
26 (i) Tires meeting the requirements of RCW 46.37.420 and 46.37.425;
27 (j) Turn signals meeting the requirements of RCW 46.37.200; and
28 (k) Fenders adequate for minimizing the spray or splash of water,
29 rocks, or mud from the roadway. Fenders must be as wide as the tires
30 behind which they are mounted and extend downward at least half way to
31 the center of the axle.
32 (3) Every person operating an off-road motorcycle under this
33 section is granted all rights and is subject to all duties applicable
34 to the driver of a motorcycle under RCW 46.37.530 and chapter 46.61