Now i have arrived and chilled out in Bangkok for about a week. Its time to get myself a bike and explore this exciting country, Can anybody help me with an address or approximate location of the nearest Yamaha dealer to Sukhumvit Soi 4,
Hope someone can point me in the right direction

If anyone has dealt with a Yamaha dealer and had a positve experience please feel free to recommend them.
Likewise if you know any Dealers to steer clear of , i would appreciate that advice too.
cheers
Matty..

you mean a big bike or a small (scooter) type? for big bikes good dealer is on ratchadapisek road next to esplanada shopping mall.
but regardless of big/small, if you are on at tourist visa, get a bike in your name can be a problem maybe. and why the hassle? on every street corner in every tourist place you can rent bikes for reasonbale prices. depending on model/age/your bargaining skills THB 100-300 per day. but for a long time (1 week or more) you must be able to get a nice discount. have fun

You've been here for a week? And ready to buy a bike now? It might be good to wait a bit, shop around a bit. Look for used bikes on craigslist, maybe. Look at dealers up country on the off chance there's a price differential. And look at the kinds of bikes that are available here, who gives you a good bang for your buck, etc., so on and so forth. There are tradeoffs, you know? If you've money burning a hole in your pocket and gots to have a Suzuki Hayabusa, well, carry on. If looking at smaller bikes, lots to choose from. Do you want that Honda CBR150 for 65,000 Baht, or would you prefer a Tiger 250 for 70,000 Baht? I have no idea, and there are plenty of reasons to choose either one. But first, you need to make that comparison on your own. Be patient...?

I do have a Tiger Boxer 250. Made in Thailand, but of Italian design. Good points and bad, as most anything would have. Definitely be sending to BKK for parts if it breaks down in Laos, so maybe not your cup of tea. Still, there's a Boxer dealer on Paholyothin (however it's spelled), a short walk north of Major Cineplex as I recall. Can't hurt to go have a look, can it? I think they're running 72,000 in Bangkok (I paid 73 in Chiang Mai). It's a MOTORCYCLE, and not a motorbike. So the shifter is with toe only -- 1 down, four up. No basket in the front for carrying anything either. Workmanship is middle of the road. Some good points, and some annoying. Mostly, I'm happy with it, but that's me.

Probably the =easiest= bike to get parts for would be a Honda anything. The others trail off from there. Getting anything for my wife's Suzuki 110 is a major pain.

Hope these comments help...