You can write to your senator, but don't expect much of a reply. It's not their job to do the research for you.
Moreover, your senator is there to represent your state to the federal government. But issues of North Carolina law are not a matter for them. The senators have no vote in the NC legislature.
Instead I suggest typing "motorcycle club north carolina" into your favourite internet search engine. It found https://www.facebook.com/nccomc/ The North Carolina Confederation of Motorcycling clubs. From there contact the clubs and ask if they are politically active, and if they fit your outlook.
You can contact your state representatives or senators directly, or you can directly contact members of the NC standing committee on Transport https://www.ncleg.gov/Committees/CommitteeInfo/HouseStanding/45 Again, not to ask them about motorcycle clubs, but to ask them directly about lane splitting.
I can't find the link right now, but the Fociety of Friends (Quakers) have some good resources for "how to lobby". The Quakers have long been active lobbyists, and have guides for individuals who want to lobby.