when i was a kid i was 6" taller than other kids and had 30 lbs on them. We did this same thing to my big wheel 85, had it bored to 115cc and it leveled the playing field. i wasnt any faster than the other kids, just finally AS FAST. when we jumped to 125's i was a lot faster and it tooik the other kids a while to get used to the bigger bike, i was already ripping.
Keefer helps keep people interested in the sport, cause he's a real dude. Racers take notice, if this dude would have been winning he'd make more loot cause of his personality imo
It wasn't cheating, it was a protest against AMA stupidity for giving the four strokes twice the cc (250) than the 125. I am curious as to whether that was really just bored or was it also stroked to get it to the 170 cc mark. Interesting that the Max Power RPM big bore kits for the YZ125 include a 167 bore and stroke kit that would turn the 125 into a 250f killer.
a 2 stroke engine makes power on both strokes, 4 strokes have an on and off cycle with ignition. they only fire every other revolution. a 125cc two stroke that fires every cycle makes the same power as a 250 four stroke that only fires every other cycle. does it make sense now?
@@Mp-jw1qg Point taken, but it didn't need to be twice the displacement, 1.5 would have been enough. That is what Yamaha figured when they drew up and developed the YZ400F which calculated 250 x 1.5 which came out to 400 and held its own against the 250 two strokes. If you divide 250 by 1.5 you end up with a about a 167 (Max Power kit). Take 450 and divide by 1.5 and you end up with 300 (KTM 300 SX-F).
@@henricusrealms8411 but then your penalizing the guys that made 4s that good and giving it to the 2s guys that haven't developed their platforms as far. Mechanically 2xs is fair both have the potential to make the same power (actually 2s can get over 100% ve pretty easy at certain rpm so abit more is possible). It's just lack of development work for the last 20yrs. Plenty was done before that in GP to put it well ahead if the drive was there. The addition of DI makes the tq curves flatter too.
@@Mp-jw1qg No, you can't dumb it down like that. 2 strokes are low compression and inefficient and have to be by design. If they could actually use their displacement as efficiently as a 4T, a 250 2T would be a 90hp bike. At the same displacement, a 2T only makes about 30% more power, not 100% more.
I cheated in 03 on a RM 139 Rick Peterson big bore Still came nowhere lol but the bike caused some shit in the over 30 class ...The bike was really good, I think the race fuel and a fatty getting holies gave it away 🤔 good times.
That guy that pushes a warm bike to the gate and kicks it right before the gate drops because the fuel line and bowl are filled up with a lil extra special 🧐🤔😇😂
@Evan Burke Bubba's bike was getting torn down every weekend for inspection. I think it is or was automatic if you made the podium. He was just that fast.
These days the factory teams have thousands in parts on their bikes and ecus tuned to the max, don’t think a big bore would make a hell of a difference. Love that you can still claim bikes at certain races
I remember the 2012 AMA Supersport (roadracing) Laguna Seca round. I was a nobody just trying to qualify and I was way down on lap times from the fast guys but my top speed numbers were at the top or near the top every practice thanks to an illegal engine built for me by a well known tuner in LA (known for building "special" superbike engines). Anyway, I qualified and finished the race and had a great time. I was an old dude, way older than these kids and I had a full time job (Air Force fighter pilot). There are always great stories from the back of the pack privateers, I love this story from Kris. Oh, and of course my boss didn't know I was racing and never would have been allowed to as a fighter pilot. Here I was on TV racing bikes and nobody at work knew!
@@BruhBruhBruh right, I still can’t find any info on them, it’s driving me crazy, I would’ve killed for a 170 big bore. Cause all we had was 140. Or the kTM 150.
Now, if we can get the AMA and FIM to boost the 2stroke cc limit so they can actually compete… Definitely want to see the KTM 300 vs 450s.
I would love to see a Yz300 as well
Still wouldn't compete. The only fair thing is 250 is 250 no matter how many strokes you have. Make the 450 the "open" class. Its time!
New 500 2 strokes would smoke the 4's!
when i was a kid i was 6" taller than other kids and had 30 lbs on them. We did this same thing to my big wheel 85, had it bored to 115cc and it leveled the playing field. i wasnt any faster than the other kids, just finally AS FAST. when we jumped to 125's i was a lot faster and it tooik the other kids a while to get used to the bigger bike, i was already ripping.
Interesting. When your size was to your advantage did you expect the others to then cheat to level the field?
right like body size is body size most pro racers are smaller and lighter not 245 throwing a 450@@RDTengineered
better to ask forgiveness than permission
I wish we were neighbors I believe we’re the same age
@@Neopaintballofficial based username and pfp m8
Keefer helps keep people interested in the sport, cause he's a real dude. Racers take notice, if this dude would have been winning he'd make more loot cause of his personality imo
calling a cheater a real dude lol L
There's no cheating in MX it called gaining the advantage! 😉
We have a ported YZ144 , when its pinned you can tell straight away its a big bore , much deeper sound , sounds fucking amazing and goes hard!!
I loved my 144 it was a fucking blast thing was so much fun
Super interesting guy, would have never known from the other bike review videos I’ve seen of him.
It wasn't cheating, it was a protest against AMA stupidity for giving the four strokes twice the cc (250) than the 125. I am curious as to whether that was really just bored or was it also stroked to get it to the 170 cc mark. Interesting that the Max Power RPM big bore kits for the YZ125 include a 167 bore and stroke kit that would turn the 125 into a 250f killer.
a 2 stroke engine makes power on both strokes, 4 strokes have an on and off cycle with ignition. they only fire every other revolution. a 125cc two stroke that fires every cycle makes the same power as a 250 four stroke that only fires every other cycle. does it make sense now?
@@Mp-jw1qg Point taken, but it didn't need to be twice the displacement, 1.5 would have been enough. That is what Yamaha figured when they drew up and developed the YZ400F which calculated 250 x 1.5 which came out to 400 and held its own against the 250 two strokes. If you divide 250 by 1.5 you end up with a about a 167 (Max Power kit). Take 450 and divide by 1.5 and you end up with 300 (KTM 300 SX-F).
@@henricusrealms8411 but then your penalizing the guys that made 4s that good and giving it to the 2s guys that haven't developed their platforms as far. Mechanically 2xs is fair both have the potential to make the same power (actually 2s can get over 100% ve pretty easy at certain rpm so abit more is possible). It's just lack of development work for the last 20yrs. Plenty was done before that in GP to put it well ahead if the drive was there. The addition of DI makes the tq curves flatter too.
@@Mp-jw1qg No, you can't dumb it down like that. 2 strokes are low compression and inefficient and have to be by design. If they could actually use their displacement as efficiently as a 4T, a 250 2T would be a 90hp bike. At the same displacement, a 2T only makes about 30% more power, not 100% more.
Everybody search engine says Anaheim three 2004😂😂😂
great interview.
I cheated in 03 on a RM 139 Rick Peterson big bore
Still came nowhere lol but the bike caused some shit in the over 30 class ...The bike was really good, I think the race fuel and a fatty getting holies gave it away 🤔 good times.
Bahaha, nah bro it was reaction 😂
That guy that pushes a warm bike to the gate and kicks it right before the gate drops because the fuel line and bowl are filled up with a lil extra special 🧐🤔😇😂
@@joenobody2580 🤯🤯😂😂
He wasn’t the only on using them at that time surely. I’m sure DB used one in later years. Privateer life baby lol
Bubbas 03, 04 was definitely in question. I know James is a different human on a bike but dude that was some serious speed
@Evan Burke Bubba's bike was getting torn down every weekend for inspection. I think it is or was automatic if you made the podium. He was just that fast.
These days the factory teams have thousands in parts on their bikes and ecus tuned to the max, don’t think a big bore would make a hell of a difference.
Love that you can still claim bikes at certain races
Unless you try to claim deegans bike....
I know you’re going to meet with the Japanese, tell them they have another guy waiting to buy the yz350f. Ohhhhh daddy want a 350!
I been wanting a four stroke ride and thought about 250s. That 350 would have me sold. be ideal to snag then probably trade my 250 2smoke for a 125.
Get the Cylinder Works 270 kit onto a 2020 YZ250F and take it to Twisted. Look up the builds on youtube it feels like a 350 on bottom end.
@@39Thacker I went with a 2020 yz250f and honestly love it. Has made me sooooo much faster and better at riding
@@jpesicka492 I have a 2020 yz250f and love it so much
This is a perfect example of how much difference a bike makes in professional sports.
I have an 04 ktm 125 and I want to know where to get a 170 kit
Think you need 144 big bore and then stroked crank
My dad got a cr500 for his birthday and big board it to a 620
Custom or can u actually buy a 500 big bore kit?
There’s no way to make a 170 out if a 125. Sounds like it was a 150.
I forgot about the 167 kits at that time.
when in doubt bore it out
Fuck, now i want a 170cc hahahaha
I remember the 2012 AMA Supersport (roadracing) Laguna Seca round. I was a nobody just trying to qualify and I was way down on lap times from the fast guys but my top speed numbers were at the top or near the top every practice thanks to an illegal engine built for me by a well known tuner in LA (known for building "special" superbike engines). Anyway, I qualified and finished the race and had a great time. I was an old dude, way older than these kids and I had a full time job (Air Force fighter pilot). There are always great stories from the back of the pack privateers, I love this story from Kris. Oh, and of course my boss didn't know I was racing and never would have been allowed to as a fighter pilot. Here I was on TV racing bikes and nobody at work knew!
I'd hear that difference in one second. Zero doubt
It’d be hard to pick out when there’s a whole pack of bikes around it
keefer sounds like he hit a joint before hand lol
Legend
Hilarious 😂😂😂
Met him
Wow👏
DV wasn’t silly
No way man you dragged all the 125s on a 250cc! Musta felt tops 😄
That lighting is so harsh on Keefer, making him look 82
crazy shit
They don’t sell 170 big bore kits. I never heard of one, I’ve been in mx since 05.
Lol
Yep 167 exists 100%, this is from 2003 so before your time apparently 😂
@@BruhBruhBruh right, I still can’t find any info on them, it’s driving me crazy, I would’ve killed for a 170 big bore. Cause all we had was 140. Or the kTM 150.
@@smartmeis check out maxpower 167 or YZ167 Big Bore/Stroker, I believe actual displacement is 166.82cc
🤣🤣🤣🤣🤣🤣🤣🤣
so when r the fines coming out. lol cheating is obvi, but talking about it..
When i was a kid, i raced my worked YZ80 against 125, beat them all and the femboys accused me of cheating !!
We got weights in fish! Everyone hates a cheater.
Cool story bro tell it again
Dude looks like an old man
The things he says and the way he looks it’s sad