My auto policy doesn't cover my motorcycle. Why not?

Because an auto policy covers the vehicles listed on it, and a motorcycle is a different machine with a different risk, so carriers insure it with its own policy. A lot of riders assume the auto policy extends to the bike in the garage. It does not, and the assumption is not even close to true.

An auto policy is written and priced around cars and trucks. A motorcycle carries different odds of injury, different theft numbers, and a different repair market, so it gets its own contract. The same logic catches boat owners. A homeowners policy typically covers a boat only up to a small limit, and usually only while it sits on the trailer at your house. Not on the water, and not while it is being towed down the highway.

There is a second surprise waiting even after you buy the motorcycle policy. A stock policy covers a stock bike. Exhaust, bags, a stereo, a lift, a winch on the ATV. Anything you added after the purchase counts as aftermarket equipment, and it has to be listed, or scheduled, on the policy before it is covered. If you have put real money into a build, the difference between book value and what you actually built is worth a conversation.

How you use the machine matters too. Riding it year round, storing it all winter, and hauling it to the mountains are different situations, and they point to different policies.

Before the season starts, pull your policy and check two things: what the bike is insured for, and whether your additions are listed. If either answer surprises you, that is worth fixing while the bike is still in the garage.