CRF150R Expert or KX100

I am 13 5' 2" and 130lbs. I like to ride trails and open fields. i need power down low and up top. Any help is appreciated.

speed wise there about the same. trail abilities are close. the only thing to consider is looks (crf looks miles better). Do you have a bike now? if so, what bike?

either one, the 150r may take a little more maintenance. the 150 has a lot of bottom and will probably need to be rejetted. :thumbsup:

I have never owned a bike. I have ridden bikes before. I don't want a beginner trail bike because I will have to keep the bike for awhile.

The red one is about a grand more than the green one.

Get a Kx100.

I've had both in the big wheel version. I'm 34, 5'-7" 140 pounds. Both 75%-trails & 25%-track. I much preferred the Honda. Very good manageable power all the way through its range. The KX like many MX bikes are very pipey. In the woods, the KX's throttle felt like an on/off switch. Maintenance is maintenance regardless of 2 or 4 stroke. If you ride them, they will need maintenance. On that note, both the KX & CRF were very reliable.

Get the 150...not quite as much top end but definately enough

I also have both (unfortunately) I have had the KX100 for 5 years and did alot of stuff to it to make it more woods friendly. I believe on the top end the KX will outrun the 150. In the tight woods the 150 will eat it's lunch. For the type of riding I like to do (tight woods, hillclimbs and general trail) the 150 is a much better fit. I am still adjusting to the 150, but have decided that the KX is going to be the one to go. I love both bikes but for different reasons. I do not do any track riding so that was not a consideration for me. I hope this helps.

On trails, at age 13, you'll outgrow the KX100 in no time at all. I'd opt for a CR125 or likewise machine.

On trails, at age 13, you'll outgrow the KX100 in no time at all. I'd opt for a CR125 or likewise machine.

Very true...the 125s power delivery also makes it easyer to ride than 2 stroke minis but it still has about twice the power

Uh, I dont know whose 125's you're riding but they definitely do not have 2x the power of an 85. Last time I looked the 85's put about 18-20@ the wheel & the 125's were in the high 20's to low 30's. A good rider on an 85 can turn lap times that are not too far off of what he/she would do on a 125.

Maintenance is maintenance regardless of 2 or 4 stroke.

Actually the maintenance is radically different between a CRF150 & a KX100. The KX would be a lot easier to maintain than a 150 & if you should happen to blow one up the 2t rebuild is much easier & cheaper than rebuilding a 4t. Both are fun little bikes & you cant really go wrong with either.

Uh, I dont know whose 125's you're riding but they definitely do not have 2x the power of an 85. Last time I looked the 85's put about 18-20@ the wheel & the 125's were in the high 20's to low 30's. A good rider on an 85 can turn lap times that are not too far off of what he/she would do on a 125.

i ddnt mean it literally...sorry

Honestly, your choice should depend on your riding style. Can try out some friends bikes? Try both a 2 stroke and a 4 stroke, even if the 4 stroke is a trail 4 stroke. The idea is to feel the power delivery and determine what you'd be more comfortable with. There is a large difference between the 2.

You can get a super cheap KX100 ($1200) and put a heavy fly wheel on it. I hear they make fantastic trail bikes for half the purchase price and half the maintenance price of a 150R! They make good low end power and maintenance costs are minimal.

I love my 150R, both track and trail. In my experience though, neither the KX100 nor the 150R like to "putt." They are much happier screaming.

You are 13 yrs old and already 130lbs. I think you'll out grow a mini bike pretty quick. What if you bought a cheap 4 stroke trail bike just to learn on? You can buy them cheap and then sell them for as much or more than you bought them for.

Otherwise, if you're dead set on a mini bike, seriously, try both types out before you jump on getting one. Let us know what you end up getting! Have tons of fun! I'll warn you know, its extremely addicting! :thumbsup:

My family is very short so i will not grow a ton. My parents say i will be 5' 10'(max).

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Joe08
      Hi i’ve just bought a CRF150R 2008, and the bike wont idle. When i got there he was having trouble getting it to idle. Anyway i went on it but he said i had to keep on revving it in order for it to stay alive. It was fine didn’t fully open it up so couldn’t identify any other isues but i did give it some throttle but seemed fine.
      So i bought it and got it home and still my self cant get it to idle. Everytime i start it it will start up and just die, and then when i go to give it throttle it just bogs out. Only the occasional time it will start up and i can keep it going but it will eventually die.
      So the guy said you have to ‘prime’ it twice before you start it so i do that and it start up  a bit longer and dies and then i go to go give it throttle and it bogs out no matter what.
      So then i put the choke on starts right up but idles high but then as soon as i take it of choke it dies and then i go to give it throttle and it bogs out. Then only way to keep it going is to choke it and then hold the rev and turn choke off and just keep revving it like i did when i first went on it at the guys house.
      I’ve looked at some suggestions on Youtube and the internet and i can’t find much, people were just saying it could be a clogged pilot jet or needing a need a new pilot jet or to change it or the air/fuel mixture screw, but the problem is i cant find it and i wouldent know how far to turn it out nor how to know what pilot jet size to get.
      So i was just wondering if anyone out there could help me fix this ASAP. Not really looking to do to much maintenance as i dont wanna break anything before ive properly riden it.
      Thanks Joe
    • By jsmith811
      Lets hear some more ride reports, Owner comments..
      Update: 11/22/06.. My son got to ride his CRF150R for about 2 hours on a small track, he has raced MX, but mostly we ride trails, only go to tracks for fun. This little engine really goes.. the bottom end could use some improvement for our type of riding, but it really goes.. if it's realiabe I'll be extremely happy with the purchase. I'm looking to add two teeth to the rear sprocket & a FWW when it's available. After that I can't imagine a bettery all around bike. Transmission is very smooth, & the little engine really pulls. The jetting is lean, we added a 42 pilot & everything seems good, it might take a 45, not sure takes it a good 7-9 minutes to get warmed up good, but it was very cool when we rode it.
    • By Deilke53
      The bad news is that the new 150 is very loud, the good news (if any) is that it's so loud stock I doubt the aftermarket companies will be able to make it much louder.
      Here's my situation: as a pro-class supermoto racer I'm fully aware that wide open exhausts make a bit more power, and I'm certainly a good enough racer to use every teensy bit of my 450's power at the track, but I'm also very aware and upset over noise issues causing track closures and the constant threat of laws banning ORV use on private property.
      I purchased the new crf150r as a playbike replacement for my beloved 150f..and of course after riding the 150r I had the same initial reactions as everyone else "WOW!" better than I could have imagined, and just exactly the bike I've always wanted as a playbike blah blah blah...umm, well, except for the noise:(. I have 20 acres of woods laced with about 2 miles of trails and jumps scaled perfectly for these mid-sized bikes and my son's sx65, but even with 20 acres there is no way that my very cool neighbors wouldn't be bothered by this thing, and there's absolutely no way I'd subject them to it.
      SOOO, since nobody is going to offer a truly quiet quiet exhaust, yet another do-it-myself scabrication project begins. The goal is to get very close to totally stock crf150f sound output while keeping as much of the R model's throttle steering/wheelie on demand kick ass power as possible. Enjoy.
      Step 1: testing. We used a straightaway to test the stock sound. We made several passes in 4th gear, under load, adjusting our aproach speed so that we'd be in the peak power and truly truly WFO while passing the meter which was placed 50 feet to the side of the track. (a reasonable test, since several of our trails come within 50 feet of a property line) 95dbA!!, yes ninety-F'n-five 50 feet!?..good god that IS a very loud minibike. Seems as loud as a 250, only worse since it's almost always pinned.
      Step 2: Take it apart.

      not much to see here, standard OEM fare, minimal perforation, minimal packing, 1.4" I.D. straight through with a slight curve in the endcap.
      Step 3: Try somethin else.
      We'll keep it simple and try the basics first. a) Increase exposure to the packing material..I've had great luck using expanded metal to replace stock perf-tubes, it's never ever failed me, and the packing does not burn out as fast as you'd think even on a 450. Reduce diameter. Using the new perforated section to taper down, I went from the 1.4" input down to a 1.1" output. c) Divert the flow. it's been my experience that if you let any exhaust flow pass straight through then a great deal of noise will go right along with i've created a diffusing chamber within the last 1.25" of the silencer shell. Now the exhaust flow (which has already seen lots of glass and had its tunnel narrowed a bit) is split by that cone on the center of the back wall and forced to take the long way around to the two (0.7" dia.) exits.

      Step 4: Results?
      Same test procedure described in step 1.....85dbA. Ten decibels less!..oh, and the bike felt like it hadn't lost any power. Hmmm, off to the dyno..

      All of these runs are corrected hp using the stock knobby..the stock run was done when the bike was new (not broken in yet) out of jetting curiousity, but we did not change the stock jetting. I've seen other stock dyno runs posted (20.7hp broken in with knobby, and BBR got 23hp using a smooth street tire) so my bike seems to be right in line with those other figures. Maybe these exhaust mods lost 1/2hp?..maybe nothing?..either way, -10dbA is much much quieter and also a far greater reduction than you'll ever experience with the typical "optional quiet insert" .
      Unfortunately, I think WFO85dbA is still too loud for my property so I'll have to try some other solutions, but it's a great start.
      This post has been promoted to a wiki
      My sons been complaining the last couple races that his brakes are little on the long side and wants me to upgrade them. I've ridden his bike before and the brakes are under par in comparison to my KX450 or my other sons KTM 65SX. I don't want to spend a bunch of money unless it's really a need so these are the options I've come up with. I'm looking for some feedback from anyone thats been down this road.
      1. replace the brakes pads with a more aggressive pad & braided line $100
      2. swap to the dual piston setup from a crf450R and Applied racing bracket total cost about $188 with new pads
      3. oversized 240mm rotor, new pads and adapter $190
      4. oversized 240mm rotor, applied racing adapter, dual piston caliper from crf450r, pads and braided lines $450 or so. (not really an option lol but would be nice)
      The cheapest is option 1 but will it really solve the issue or only be a bandaid and then later I'll end up spending more money.
      Any input would be great.