Yes, you can trail ride a Motocross bike, however the stock gearing and suspension on a mx'er aren't the best for trails and woods.
are framed bmx bikes any good
Yes! Bikes are very much popular in Israel and you can find many of them all over.
Orbea has a whole range of bikes. But yes, the brand has a fairly good reputation.
Any of the Crusty Demons, TerraFirma, Travis Pastrana's, Fox Racing and an oldie but goodie, On Any Sunday (the original motocross film). Below is a link that has some motocross dvds: http://www.videoxsports.com/extremedirt.html
Any motorcycle shop to buy a new one, craigslist.com is an awesome place to find used bikes. You can also usually look on motocross fourms such as mxcrazy.com depending on where you live. Ebay? That's all I can really think of.
They would have to be in a 90 cc class or lower to race quads. But you can be any age to race dirt bikes.
That is kind of a tricky question. Dirt bikes encompass any bike that is ridden off road plus what are known as dual sport bikes. Most of the manufacturers categorize their dirt bikes as motocross or off road. Basically "dirt bikes" break down like this; 1) Motocross race bikes and woods race bikes. These are both liquid-cooled bikes with aluminum frames and racing suspension (compression and rebound settings, long travel, etc.), the woods race bikes just have some minor changes such as a wider gear ratio, a heavier fly wheel, bigger tank, lights, softer spring rate, etc. 2) Trail/play bikes. These bikes have air-cooled engines, steel frames and much less suspension than the race bikes. 3) Dual Sport bikes. This category is everything from Woods race bikes with a dual sport kit installed to make them street legal to production dual sport bikes such as the Honda XR650L and BMW 650GS.
Yes
What do you mean? I can probably answer any question involving Motocross (Motorbike racing) but do you mean how do you participate? Well, the way I race, is I go to big national races, where a bunch of other people race too, against me, but only in my class, (bikes around my size and people my age) and we race dirt bikes, basically some people only race for the fun of it, but some people only race for the prizes. If this wasn't your question or not a good answer, I'm sorry.
For professional motocross, the biggest bike that is allowed to be raced is a 450 four-stroke. For local race purposes there is a Vet class that allows any size bike to be raced (usually up to 525 since that's the biggest motocross bike that KTM makes).
Comfort bikes are a modern version of the roadster and sport roadster bicycle. Comfort bikes are a subclass of hybrid bicycle and typically include a modified mountain bike frame. Often used as an entry level bike for commuting with very limited ability for use on trails or any type of distance riding.
any where