Ok blasterbiotch, if four strokes suck, why do the pros use them?
Dont you dare say because of emissions, emissions are not regulated in closed course racing. In the words of gscx: "do you think nascar even comes close to meeting emission standards?"
And dont give me that half displacement equal power bullshit either.
A crf450r comes to the 50hp with only a slip on
http://www.twobros.com/Cust_Service/Dyno_Charts/dyno_2009_hon_crf450r_SO.pdf
A yz250 bored to a 270 which falls 45cc's above half displacement mind you, makes only 45hp, not including the assload of other mods on the bike...
http://www.thumpertalk.com/forum/archive/index.php/t-442434.html
Now, read this...
http://www.motorcycle-usa.com/276/525/Motorcycle-Article/2002-Yamaha-YZ125-vs-YZ250F.aspx
the yz125 (in 2002, before almost any R&D was put into four strokes), the yz250f kills the yz125 everywhere, do not bring up that little 100rpm advantage the the 125 has, no motocross rider could keep it there the entire time. It does no good, the yz250f would already be gone. Now, onto the blaster vs raptor 250, the raptor makes 17hp stock while the blaster is stuck at 12hp. The raptor is also lighter, 15lbs to be exact. How do you explain this? Four strokes provide 100% burn to intake efficiency even at low speeds.
The two stroke's fresh fuel intake will always be lowered due to the fact that the exhaust and intake port are open at the same times. And no, the expansion chamber is not functional from low speeds. That gives four strokes the edge, maximum efficiency so they can always be improved. Not only that, four strokes have more traction, thats a fact. The linear power does not put an excessive shock to the rear wheel after takeoff, meaning once it hooks up, it stays hooked up, unlike the two stroke. Four strokes will always be improving, and a few years down, four strokes may be making more power at equal displacements. Now I know I own a banshee, and its going to be a great dune machine, but im not going to have it for long, the whole plan is to build it and to trade it off for a CRF250R. Top ends also last longer on four strokes, sure they cost more overall, but they are worth it to me. Ride your two strokes, nobody is stopping you, but the four stroke revolution is here, I like to switch it up every now and then and ride a two stroke myself. A sad fact about most of you die hard 2 strokers is that either youve never ridden anything else, or the four stroke you rode was a utility quad, or under 450cc's. Or if it was a dirt bike, you probably rode a chinese one, or one that was neglected, and of course, under 250cc's.
Now come on guys, lets talk logic, I have all day.