Today Honda increased the price of their 3 new 500cc bikes by 6000baht. This is about 3% of the sales price and they say it is due to the new tax. These bikes are not imports and are not over 800cc, so the new tax appears to be on a sliding scale and apply to all new bikes sold here. Surely their must be some official statement somewhere clarifying the situation, maybe only available in Thai at the moment.