Suzuki’s biggest scooter is the Burgman 650 , with a 638 cc engine and a curb weight around 238 kg; it was the largest production scooter by engine capacity in the sources I found. Kawasaki’s scooter range is much smaller, with the J300/J125 family around 125 cc to 300 cc, so Suzuki’s biggest scooter is far larger in size and displacement.

Quick scoop

  • Suzuki biggest scooter: Burgman 650, 638 cc.
  • Kawasaki biggest scooter: J300-class maxi scooter; Kawasaki’s scooter lineup in the sources centers on 125 cc and 300 cc models rather than a large-displacement flagship scooter.
  • Size gap: Suzuki’s top scooter is closer to a touring maxi-scooter, while Kawasaki’s scooters are more compact city-oriented machines.

Simple comparison

Brand Biggest scooter found Engine size Character
Kawasaki J300 / J125 family 300 cc or 125 cc Compact maxi-scooter / urban scooter
Suzuki Burgman 650 638 cc Large touring maxi-scooter

Bottom line

If you mean “which brand makes the larger scooter,” the answer is Suzuki , by a wide margin. If you meant the physically largest scooter model from each brand, Suzuki’s Burgman 650 still comes out much bigger than Kawasaki’s scooter offerings in the available sources.