Funnily enough, I did the same as Lorraine but the next day, both bikes arrived from Mongolia on the same plane.
Differences, mine took 6 hours, because they were very busy and I did not have an English speaking chap to guide me through the process, it was just ad hoc asking as I went.
They did ask for a carnet, which I have anyway and never have used yet, but they did not want to use the forms, they wanted 2 photocopies of one form and they then filled that out, go figure!
Th difference up front was that I had engaged an agent to start with, then dismissed them as too expensive once I got the paperwork. If I had known about the above process I would have not bothered at all.
Just as a clarification in Lorraine's description about the direction of travel. When you arrive at the toll gate, or security check in gate, there is a brick building just on the right and is labelled "FREE ZONE SERVICE" Go in here and pay the 27B for your security pass, do this first. Then walk straight ahead until you get to the end of the freight office buildings, about 200m or so, then there is a large building on the left with a walkway under it in the middle, it has a Seven11 store, a Thai cafe and a lady with the photocopy machine in that walkway, as well as many ATM's. After going through that walkway, the next building houses the Customs, that is the beginning of the paperwork trail.
You will need 2 copies each of
Passport entry stamp to Thailand
Letter from Freight airline
they cost 2Baht each so a big cost of 20Baht total
The cafe uses tokens, buy them from the girls to left inside door, the tokens are in several denominations but a book will cost 100Baht, each food stall has the prices and you give them tokens for the stuff you want, no dirty money changing hands
I found all this out because I had to wait a while, lunch cost 50Baht
1. Go into customs and hand over all the paperwork, they will do stuff with it.
2. Proceed to the next counter, they will point it out to you and the lady there will 'check out' your paperwork and cross you off a customs list
3. Go through to the security section check point, using the security pass you bought, this takes you into the 'bonded goods' area of the airport
4. Find the relevant cargo point, in my case it was Thai Airways, Cargo Building 1, Gate 36.
5. This is important if you do not have a fixer, you must NOW pay for the bike storage, someone will show you where to go but in my case it was on the 3rd floor, go upstairs until you find the payment counter, get a receipt.
6. Take this paperwork downstairs to the 'freight release' office on the loading docks, they will do stuff with the paperwork which will now be put in a queue for one of the handlers to pick up and process, and your bike is now available for retrieving from bond.
They will then bring it to unpack, in my case it was out front on the loading dock in a corner. Putting fuel in was easy out here, just make sure nobody is smoking, although the whole area is a no smoking area, everyone smokes here. During this time a customs official will inspect the bike VIN and engine number and sign and stamp the exit document
Once you ride off, you hand this piece of paper to the guys at the exit check point, a large 'toll' booth looking place, a customs man takes it off you and you are free to go
I hope that helps others who are not so lucky as Lorraine and find themselves getting frustrated. If I had of known about going upstairs to pay, I would have saved an hour instead of sitting around waiting!!!
One chap helped me a bit with the manual bits, lifting the bike and generally helping, sometimes he got in the way, but overall he was good, with no English
I paid him 300Baht for his troubles, it was what he asked for.
Take PLENTY of water, it is hot and steamy work and you will sweat buckets. There are food and drink machines and toilets in this area