Sounds like a tough situation. I commend you for being such a supportive wife to your husband as he pursued his goals and even through the setbacks which he brought upon himself. By doing so, you've demonstrated a strong "team" concept which is needed in marriage. You have also been forgiving, which is always a plus.
I'm no expert in the area so my counsel may not meet the skill level you're seeking, but here goes. First of all, you're not overreacting by being disappointed about your present financial arrangements. You have good reason to be concerned about the lack of balance in the situation. It affects your financial future, how you feel about you, your perception of him, and ultimately your marriage.
I understand why you are against the purchase of the motorcycle. It's an irresponsible decision and furthermore, it should have been both discussed AND agreed upon. Obviously that did not happen. I sympathize with your frustration and feel that your next steps are critical. Insisting that he give up the bike and demanding a drastic change in your financial arrangements may trigger an explosive situation between you so I would use a "snowball" method of regaining some balance. I would agree to let him purchase the bike under the condition that he resumes making a reasonable deposit into the joint account that you've spoken of. After the purchase of the bike is complete, he should roll those funds into picking up some of the bills freeing some of YOUR funds to be deposited as well. This will bring you into an equal partnership that works for both of you.
For what it's worth, I'd like to say THIS as well. To your credit, your husband has a wonderful partner in you. He would be sadly mistaken if he ever took that for granted. With that being said, the only way that he'll ever be able to maintain a healthy respect for you is that YOU step up in the area of respecting you and allow him to be all that God has called him to be as a man. I hope that my input has helped.
P.S. If you choose to implement this suggestion (or some version of it), try to present it in a non-threatening way with the goal of creating equal ownership in both the bills and the savings.