Like the Phoenix rising from the ashes Two Stroke Motocross is reborn!
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Man what happened around here. It seems that it isn't just 4 stroke lovers that are delusional !!
I'm not sure, maybe or maybe not. That bike had 7ish hp at 50cc's. It wouldn't be a HP per cc gain maybe, possibly it would be a percentage gain, no? So the gain from 6 - 7 hp at 50cc's was like 15 + - Percent? Now take a 50 HP KTM and give it 15% more HP.50cc's gave 1+ hp gain? That's impressive. Percentage to cc wise, that would be pretty big on a 250cc 2 stroke.
5HP
I wonder how much HP a CR500 motor would have if you ran 3 38mm carbs like it probably could breath correctly. For low end, you could actually run them like a powervalve does. One opens at a time rated by RPM's. 100+ HP?
this may be a stupid question considering I'm a two stroke rider. I know how to change one put it back on in top end jobs all that jazz but what exactly is the powervalve like what is it's function? I know it opens at a certain rpm and gives you a major boost but what is it introducing more air/gas or what?It kinda does the same thing, if you would run a small carb on your bike. It would give you more low end, but it would take away topend, because the flow can only move so much air. So when closed, it restricts the flow. (It also changes the sound waves, but that is more indepth) Too much air in a motor, when it is at low RPMs can work against you. So when you close that power valve at low RPMs, it limits the air flow, but when it opens up, with RPM or electronic valves, it starts flowing more air, thus the rise in HP at that point. Try running a 40mm carb on a 125. It will have 0 bottom, but if the motor can accept the 40mm flow at top end, that thing will sing. On the big bore motor, apples to apples like a 500AF vs 450F, you don't need it so much, because the torque of the 2 stroke will still give you enough low end to beat the 450F anywhere in the curve. One thing to keep in mind on the big 500AF's, is that they use the same carb as the 125's now a days. 38mm. HP would be out of this world with a matching carb, unless you believe a 500 breaths the same as the 125s do. I'll compare 250 2 strokes to 250 4 chokes instead of skewing things, because the people who keep on saying how great the 4 strokes are, always bring up how great the 450F is, blacking out the 250F as if it doesn't exist, like the media does Ron Paul. Even though as amateurs, we run cc vs cc mostly.
Not to mention that if you're used to two strokes (I've never owned a four stroke racer) even a non powervalved two stroke is controllable to ride and race. I loved my non powervalved bikes just as much as my 125.Totally agree. The CR500AF was pretty smooth. The main problem it had, wasn't that it had a "powerband," it just had too much power. So like I've said, a 350 2 stroke with balanced motor and electric start would probably kill all. As you go up in cc's, the less you need to have a powervalve. The torque and hp are fine without it. A DI would probably just help it, that much more...
So who's trying to shove anything down who's throat? Seems they came here to tell us how good the 4 choke is...
Around here people are dumping 4ts because guys are winning big on 2ts. Guys that were in the points lead on a 250f switched to 250 2ts because they had been beaten bad by 250 2ts with lesser rides on them. So I don't see a 4t being faster and the weight diffence at the end of a moto the 2ts wins again and don't fall over on the 4ts and stall you may not start it till the race is over.Fair enough, i agree. I'm just saying what i'm seeing here.
Over here it's 250 vs 250 across the board and the 250f's are competitive.
yes our nationals were won by a pro on a modded 2t, but he only just sneaked in and had to fight hard for it, and this is Darryl King we're talking about. There were no other 2t's in the top 10.
