can i just use thee r1's title and drive with it that way, effectively stating that it's a modified motorcycle?
The days of registering a "modified" (my words) vehicle based on the donor's VIN are rapidly coming to an end. This process was commonly used in the past, for instance, for registering VW-based dune buggy's. Many states now prohibit this method by statute, if not practice. However, Michigan does provide you a legal and straightforward means of registering your "modified" trike as an assembled vehicle. Pick 1, 2 or 3 from the below. I think that you will find you fit into any one of these catagories. http://www.michigan.gov/sos/0,1607,7-127-1585-25476--,00.html
Some owners want to know how they can title and register an assembled vehicle. An assembled vehicle is:
1. One built (assembled) from new or used materials and parts by someone not recognized as a manufacturer (usually an individual). Example: homemade vehicle.
2. One altered or modified to the extent that it no longer reflects its original manufacturer configuration. Example: a Volkswagen made into a dune buggy.
3. One which has had its body replaced with that from another vehicle. Example: pickup truck has its cab replaced.
4. One assembled from a kit (often called "kit cars"), even if a Manufacturers Certificate of Origin is provided.
And here are the instructions for registering it:http://www.michigan.gov/documents/BFS-72__09-03__83315_7.pdf
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