I have rode a Suzuki RM250 in the sand for the last year. I want to get into trail riding. I am very intrested in the 250F. So I have a few questions:
1) How slow can you go in first gear?(How low is it?) Is it lower than a 250 2-stroke?
2) Can you go slow for long periods of time? Does it get bogged up like a 2-stroke?
3) Is this a good bike for trail riding?

yeah it can go slow for a lot longer than a 250 two stroke, also it is alot better for trails riding, its first gear has tons of power so you can keep it goin slow, or use its power to dig you out wihtout shiftin

Not to mention the extra tork because its a 4stroke will make it better in the slippery stuff and when the going gets tough.

While the Yamahas have a more 2-stroke like powerband than the other brands it is still WAY more linear than a 2-stroke. You can lug them all day in the tight stuff, we did last spring for 6 hours and 110 miles in high 2nd/low 3rd no problem. The bike will also pull throughout the entire RPM range and you don't need to be "on the pipe" to get your power.

I ride trails only and have ridden my buddies Kaw 250 2-stroke and the 4-stroke is better suited to the trails (IMHO) as it is more predictable. If you are a racer and not the weekend warrior type this may not apply. An example of what I am talking about is practically any trail corner where he can ride in third and give it full throttle at the corner apex and the power comes on after he is out of the corner. I just lug it in second or third and roll on the power. If I rode it the same way he does I would have instant power and be hanging from the trees. In fact when we switched bikes he did shoot off the trail and I felt like I was riding a dog because we didn't properly adjust riding style for the type of machine.

In the really slippery or sandy stuff the 4-stroke will require less shifting and be "easier" to ride as it is more linear.

Finally, no more premix! Just gas and go.

What they said is absolutely true.

However, the 250F is NOT a great sand ride. It will do it OK, but other bikes w/ a higher horsepower to weight ratio (like the RM250) do it better.