There are a few companies here that export parts in reasonable quantities so maybe able to help. But first what kind of bikes and where to. Someone who exports parts for sport bikes will not really be interested in classic Vespa's.
We at Tyga Performance (www.tyga-performance.com), are an official motorcycle parts exporting company based in Sattahip, Chonburi, Thailand and have been in business for 10 years. We are are ex pat managed (British) and are looking for export opportunities for the latest crop of domestic models in Thailand so we would be interested in talking details. We mostly do parts (Honda, Kawasaki and our own TYGA Performance brand but we have shipped bikes before (exporting 2 strokes to the USA used to be my business before TYGA). We have experience in LCL and container sea freight as well as air cargo and have an account with UPS.
Regarding the model bikes you require, we took delivery of the first new model CBR150 in Pattaya yesterday and can source more. The CBR250 doesn't have an oficial availablilty date yet so I can't advise but should be before the end of the year according to our sources. The Ninja is available of course and we can supply. The VTR is not sold here. Basically, anything that is on the market we can source and prepare for export. It is up if you want FOB or CIF or even door to door. Let me know if you are interested and we can take it from there.