The fire ignited just before 3 a.m. at Mt. Holly Motorsports on the 2000 block of Route 206.
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Chief Scott Mitchell of the Vincent Fire Company told Action News the fire started inside the repair shop and extended to the roof.
Mitchell said some firefighters were evacuated as a safety precaution.
Crews worked to remove equipment from the dealership as they battled the flames, the chief said.
The fire looked to be under control but then just after 6 a.m., flames started to erupt once again.
Chopper 6 over fire at South Jersey motorsports dealer
Mitchell said firefighters will use heavy machinery to gain access to the building that they otherwise cannot reach.
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"So we are going to have to take apart the building a little to take the fire out," Mitchell said.
No injuries have been reported.
The dealership sells dirtbikes, motorcycles, ATVs and utility vehicles.