Suzuki Thailand had indicated that they are going to sell the Burgman scooters in the beginning of 2010. On the Thai Suzuki website you can find specifications of the Suzuki Burgman 650, which will not be cheap.
If you looking for a Suzuki Burgman 400, you can contact RedBaron motorcycles in Bangkok, they often have a 400cc Burgman for sale. And I believe they even imported them on request.
Alternatives to the Suzuki 400cc scooter is the Yamaha Tmax (499cc) which retails at 555,000 Baht Check the Yamaha price list If you want something in a lower cost range, Lifan has the LF250T-6B a 250cc scooter available.
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The Suzuki AN400 Burgman the Alternative Ride
