Submitted on Friday, September 20, 2013 8:23 PM by Dylan Rice
2003 CR125 porting and head mods
“I had MaxRPMs port/polish my motor and re-chamber the head a while back. I run it on straight VP110 gas. Man that thing is fast! I think it will take my 2012 CRF250. Just wanted to say thanks!! Made a big difference!”
Submitted on 2013/03/01 at 8:38 am by Ray Baldwin
“YZ285
I thought I would send this photo to you I really do love my 285 Yamaha you should be able to see your stickers and the #285. Love this bike I have put over 4200 off road miles, since August and in the last 3 years I have over 11,000 miles on this cylinder. This is not easy gravel roads it is single tracks and atv trails, in the Colorado high country, and single track and desert riding in the Moab Utah area. I installed a wide ratio transmission I.E. wr450 3rd-4th-5th with one tooth larger that stock on the back it still does over 80mph. The 285 has more than enough torque to pull the higher gears no matter where I am, high country or desert. This bike shocks everyone with the 450s as that they just can’t get away from me. 🙂
It seems like after I ride with them, the next time I see them they have a pipe or new ignition set up or something else to increase the output of their 450’s.”
Submitted on 2013/02/11 at 8:23 am by johnboy
“02 yz 167 from these guys
I have never rode a more well ballanced bike with the power of a 450…you can burn up the hills or just putt around the yard,,my buddie wanted to go riding,,,hes got a yz250f,,he said lets go if you can keep up…and laugh at me,,,,after he caught up a mile later with his mouth open,,,,never to say ,,,,he was trying his best to buy it…very very good match this motor is to the yz125,,,,thanks guys”
Submitted on 2012/07/05 at 9:27 am by Grumpy18
“I have been running the 498 kit on my 02 Honda 450 for around 5yrs, its been awesome! I mainly ice race it but a few times a year hit the tight trails. The 498 make gobs of mid-range torque and on mine big top end power. When people notice the billet cylinder it creates alot of talk in the pits! Extremely happy with this product, just picked up another bike and going to try the 523 kit this time. Thank you Max Rpms for a great product!”
Submitted on 2012/05/15 at 8:26 am by Andreasen Racing
“Just Plain Awesome !
This is just plain awesome. I now have the power to go and do what I want with a 125. I’m an old “master” or “super senior” or whatever you want to call a 50+ racer, and I love the fact that I can have the power to get myself into trouble & the power to get myself back out. Even with a desert tank on it, the bike still weights less than any 450 and most 250f’s. It is just plain fun to ride! My only issue was getting it jetted, but Josh helped me out when I needed it. I put an 11oz. flywheel on and the bike will crawl over most any obstacle. With this flywheel on it , it doesn’t rev out as fast and hitting the clutch doesn’t get it spinning like a 125. I think I’ll get an 8.5oz flywheel and try it. I’m running a Barnett basket and the clutch has never been so smooth, even stock. I run a V-Force 3 and an i-boost and response is right now. I use this bike to desert race and trail ride and am so impressed that I don’t think I will get a bigger bike in the future. THIS IS TOO MUCH FUN!
Dennis Andreasen”
Submitted on 2012/05/08 at 9:33 am by Eric Tinker
“We are 100% pleased with Tim and Josh. The motor is beyond expectations. Very reliable very strong. Our PR2 motor blew up too many times so we tried the Max Power big-bore (very good motor) then upgraded to the 105 stroker. Absolutely NO problems. We love these guys! Eric Tinker RM105/YZ125”
Submitted on 2012/02/20 at 8:28 am by Scot
“I have had 4 of these, and they are so much fun you cannot even describe it! My current 167 is an 09 that was set up for torque by MAX POWER, and I ride desert and mountains – I dropped 6 teeth in the rear and up 1 tooth in the front, so it is geared really tall, and it handles everything from gnarly, rocky, 1st gear 2 MPH hills to wide open desert, where my top speed is greater than most 450′s. I can do any hill that a 450 can do, unless it is a pure horsepower hill – deep sand or something like that. I can take off from a standstill in 6th gear with no major drama.
Too Much Fun!
I can turn inside everyone. If we get into a boulder patch and get stuck, I can pick my bike up and move it, as it weighs 40 lbs less than most bikes…
I’ll be riding these til I drop.”
Submitted on 2011/11/01 at 8:36 am y Trail Rider
“yz285
love the power that the yz285 puts out compared to my stock 250. it lifts wheels shifting down the road all the way to 3rd gear. looks good on my bike and cant stop saying it but its so powerful. i blew my friends honda trx450 away in a drag race. would highly reccomend this kit without doubt. need to wear goggles cause the wind makes your eyes stay shut its really that fast.”
Submitted on 2011/02/23 at 8:35 am by Scorr Racer
“yz 285
I love this kit just got ours re done last week and this thing is so quiet and it just shines anywhere no matter what the conditions. woods or moto. it can kick a 450s but any day. Love it Thanks RPM!”
Submitted on 2010/09/24 at 8:17 am by Kawi Rider
“This is the most awesome mod motor ever. It starts easier than stock, it pulls hard and forever on the top. I have had no issues and will do it to my next 250f. Many mods you lose either on the top or the bottom, this thing rips everywhere!!!!”
Submitted on 2010/07/26 at 8:34 am by Raymo
“Your friend will be bummed. I have been running the 285 kit on my 05 250 for almost two years this last fall I put a wide ratio tranny in my Yamaha. I have a friend that just got a 09 450f. No matter where we race he can only beat me on top end IE over 75 MPH we are running the same gearing IE stock for the kx 13-50 I’m running the same on my 285. He just shakes his head,and says that thing is really fast. So last week he ordered a new bomb header and new computer programmer. He says it is only to make it start better. But i know the truth he can’t stand that my lowly 285 yz is a fast as his brand new fuel injected 450f. I highly recommend the staff at Max RPM they have been awesome to deal with.”
May 2008
Dirt Wheels: TRX522 – We don’t build em much harder than this!
“It has stump-pulling power down low like you wouldn’t believe. Then, it hits a monster mid-range surge that has you hanging on for dear life. The motor pulls so hard you have to make sure you have a firm gripon the handlebars, otherwise, look out mama! Next thing you know, you’re revving out on the top end, and going so blindingly fast that it is all you can doto find the brakes, and get it slowed down in time to make your turn. You know what we call that? FUN!”
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May 2008
Motocross Action: RM-Z 276 Stealth”It’s a light weight, flickable bike that scores an unanimous 10 from the panel of fun judges.”
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January 2008
ATV Action: LT-R 550
Maxpower/RPM’s is known for building some of the most powerful ATV motors around. We know that. So when we got a call from Maxpower asking if we wanted to test their new LTR stroker kit, we tried to stop giggling like schoolgirls. We waited for weeks to get our hands on what we were sure would be the fastest 450-chassis quad we’ve ever ridden, and when we finally got our hands on it, we didn’t know what to do with ourselves…
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October 2007
Dirt Bike Rider UK: KXF276
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July 2007
Motocross Action: YZ285
“Could our Max Power YZ285 beat the 450 four-strokes in hand-to-hand combat? With a motivated rider it would be “mission accomplished””
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June 2007
Dirtwheels: LT-R 498
“The power came on smooth, and strong all the way through the mid-range and right up to the very top end.”
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December 2006
Dirtwheels: TRX 522R vs. TRX 488R.
“This mod(TRX488) transformed our stockish TRX450 motor into one of the easiest-to-ride, blazingly fast, monster
powerbands of any modified Honda engine we have ridden in some time.” “In a word, perfect power. Well, make that two words.”
“When we put a stop watch on our pro-level test rider(riding the TRX522) he consistently cut lap times that were two to four seconds quicker per lap. In ten laps that translates to 20 to 40 seconds time. A sizeable sum that would put you at the finish line well ahead of an equally skilled rider aboard the 488 kitted machine.”
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December 2006
Quad Off-Road Magazine: Maxpower/RPM’s YFZ523
“By the end of our test session the Max Power-RPMs YFZ523 had made believers out of us. Previous to this, our test rider had a bias against big bores, but he admitted at the end of the ride that he would own this YFZ and would be excited to ride it at the dunes, on the trails, or any of his other local riding spots.”
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December 2006
ATV Sport Magazine: TRX522
The biggest advantage of the ICE CUBE was its pulling power and ability to lug gears. Our test rider noticed power strikes right on the bottom end and hard pulling all the way through the power band!
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October 2006
Motocross Action: CRF264 Stroker
“MXA’s biggest concern with big engines is the powerband. If done wrong, the engine starts to feel like a small 450 instead of a big 250. It loses rev on top, gets chunky in the middle and decelerates like a steam engine. Luckily, this isn’t the case with MaxPower’s 264 kit. It doesn’t lose any of the CRF250’s inherent traits—it just adds a ton of torque.”
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September 2006
Dirtbike Magazine: KX276F
“Whoa! First off, this has to be the easiest starting four-stroke that we’ve tested. Power wise there is no comparison to the stocker; the CUBE hit harder, sooner and has meat. It craves a higher gear, pulls the cog with apparent ease, and gets with the program post haste.”
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