old 2stroke dyno charts!

2002 250cc dyno runs. Notice the ktm has about SEVEN horsepower over the other some of the bikes in the mid/lower top range. Wow! KTM knows how to do power in a 2t.
more to come, in no particular order lol. Im just bored and figured someone would enjoy this. Is that yz250 REALLY revving to 10,800rpm?

2000 Dirt Rider courtesy of Hasletjoe. Curiously, their kx peak power numbers are 4-5 lower than MXA claims for the KX250.
More to come.

1996 250 dynos. The 96 RM250 with its one piece main powervalve has two to three more hp all over the band than the 97 RM 250. That two-stage powervalve killed the strong hit on the 97! ( I owned a 97 RM 250 so i noticed it more more to come.

94 & 96 ktm250sx comparo

97 Dirt Bike 250 dyno

One thing i always noticed was that at (i think) 5500-6500 rpm, the honda ALWAYS seemed to have 2-3 more horsepower than the other bikes. Every single year up til the early 2000's. That part of the powerband was the CR250's wheelhouse.

94-95 KX250 numbers. Kawie had moved the intake and carb closer for 95 and juggled the kips and ignition timing and put a 100mm longer pipe on the 95. It had midrange in spades over the 94 but lost upper rpm power to its predecessor.

95 & 96 RM250 compared to 96 CR250.The 96 RM bests the CR slightly til (surprise!) 5500-6500 rpm. Then the CR kicks in the hit. After that both bikes seem pretty even. Even the 95 RM has 3-4 more hp in some spots than the 96 RM! Oops! Dirt Rider magazine loved the 96 RM though, and said it "ripped".
Didnt rip enough to beat the honda , but its suspension was apparently much better.

Feel free to add any 250cc dyno charts if anybody has some. Ill make a separate 125 topic if anybody gives a shit.

I think i only have 95-97 125cc charts. Ill post em in this topic.

1985 80cc dyno The only other minibike dyno i can remember was the much-maligned 1986 kx80, which had 4-5 more horsepower all through the midrange over the beloved 1985 kx80. For some reason the 86 kx80 powerband was razor thin. My cousin had a new 86 kx80, and my 85 cr80 felt like an open bike on the bottom end compared to his kx even though his bike had 4 more hp on the dyno on bottom end. Weird!

96 125cc Dirt Rider dyno.

94-95-96 RM125 dyno

I had all those old dyno charts back in the day but cant remember them. I DO remember the 86 cr80 having one horsepower for every two pounds of weight power ratio or similar. They compared it to a "top fuel dragster" lol. People dont realize how much less friction and power a nikasil liner provides.(which was the major diff. Between 85-86 plus very minor porting changes.)

1997 125cc dyno

There HAS to be more people with dyno charts to share. It takes me ten seconds to snap a pic and post it; come on guys! This is a nice resource for guys who buy used bikes. Ive got basically every bike test from 96-97 as well if anyone wants a copy for that vintage 125 or 250.

Cool! Thanks!

1988 RM250. Great power curve; the magazines raved about its tractable and smooth powerband, and in this case the dyno backs it up.

Dyno readings are strange: in many, many cases, a bike will have a powerful power and torque curve on the dyno, but the transition to actual power in the real world will be the polar opposite- as in the 1986 KX80 we talked about. I also remember the 94 or 95 yz250 was NOT the class of the field, but somehow the bike was a holeshot machine that always felt hooked up with ample traction, according to the magazines that year. I think that it has a LOT to do between the relationship of the swingarm pivot, rear suspension and axle relationship if the truth was known. Kawasaki took a strong motor (85 kx80), ADDED MORE power and torque everywhere, and put it in a brand-new frame that suddenly gave the bike a razor-thin top end only powetband- even though the dyno said the exact opposite. Very interesting stuff to me

Wow! That yz125 was a killer.

I couldnt find a chart for 01. Im sure somebody has it, but whether anyone will post it is another thing.