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Author Topic: 2001 CR 125 Engine options  (Read 4622 times)

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Offline Scooter T

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2001 CR 125 Engine options
« on: March 28, 2012, 01:46:59 AM »
To make a long story short, I am trading a mini bike project for a 2001 CR125 roller. I was wondering what my engine options are for this chassis. What engines, from previous years, will bolt into this chassis? I know some years have been better than others. Any thoughts?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline luthier269

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2001 CR 125 Engine options
« Reply #1 on: March 28, 2012, 04:58:50 AM »
Go To Eric Gore's web site he has big bore service for this bike. We have been racing a 2001 cr125 for almost 3 years in the 250C class won two races on it and handles well. Also there is an artical on this web site for this bike look in the arcives.
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Offline motoman356

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2001 CR 125 Engine options
« Reply #2 on: March 28, 2012, 09:32:52 AM »
I've heard you can bolt in the famous 97 cr125 motor. this was the BEST motor honda put out on the tiddler and has been crap compared to everythin else since 98. id try to find out if this would be possible then get some custom work if necessary or it was the cylinder that was compatible with the newer cases not sure. that or just get the newest motor you can and slap a 144 in it. the newer cr's respond really well compared to others as the cases are kinda big for the motor. i talked to a tuner about then you could only go one way or the other meaning all top(pros on mx tracks) or all bottom (for sx) it wouldnt do any in between. however i have heard that some tuners figured out by using epoxy they could "close" the motor up to get a better tune
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Offline Super Trucker

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2001 CR 125 Engine options
« Reply #3 on: March 28, 2012, 06:10:35 PM »
The 1990-97 motors where good,the 05-07 has a stronger motor 5 more hp,and has the same peak hp as a 2012 ktm 125. All depending on what kind of tuned motor you want, a 2mm ovr borre should have good torque #,s or porting for mid-top and carb borring should have a strong mid to topend with a weak bottom end. There,s a youtube vid of a 01 with a pc motor-blackfoot xpro bike, imo I would go with porting mid-top,borre carb, that would be cheaper than a bigborre and would sound alot better.That would,nt be anygood for trail riding tho.
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Offline SachsGS

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2001 CR 125 Engine options
« Reply #4 on: March 28, 2012, 06:48:54 PM »
I've always wondered about the 5sp vs 6sp thing with the 125s.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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2001 CR 125 Engine options
« Reply #5 on: March 28, 2012, 07:05:54 PM »
apparently shifting gears and powerbands are just too much for todays riders, as they are now literally racing semi-automatic (rekluse) 4 strokes in SX.

just lets you know how awesome guys like McGrath really were.
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Offline cnrcpla

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2001 CR 125 Engine options
« Reply #6 on: March 28, 2012, 07:10:36 PM »
Quote
apparently shifting gears and powerbands are just too much for todays riders, as they are now literally racing semi-automatic (rekluse) 4 strokes in SX.
Just wait until they add another 50 pounds to the fooper pigs by adding an automatic transmission  :<img src=" title="Roll Eyes" class="smiley"> But I would say if the 96 cr125 engine would fit into the chassy, then go for it.
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Offline Shawn36

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2001 CR 125 Engine options
« Reply #7 on: March 28, 2012, 07:49:02 PM »
What's wrong with rebuilding the stock motor?  Nothing you're going to bolt in there short of a 250 is going to make it significantly faster.  The main issue with the aluminum frame Honda's is the air flow is choked.  I had and raced new CR125s from 94 through 98.  I can tell you the 97 motor wasn't anything more special than the previous years.  The bike went down hill with the twin spar frame. 

Not to get drawn into another 4-stroke debate on a 2-stroke site but what riders in SX even run a rekluse?  I don't see a single top rider running rekluse stickers.  But the entire track can be ridden in pretty much 1 gear, especially with a factory transmission and their longer 2nd gear.  It wasn't THAT much different with 2-strokes either, on a 250 you only needed 2nd and 3rd. 
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Offline Scooter T

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2001 CR 125 Engine options
« Reply #8 on: March 28, 2012, 07:50:55 PM »
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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2001 CR 125 Engine options
« Reply #9 on: March 28, 2012, 08:30:32 PM »
Quote from: Shawn36 on March 29, 2012, 02:49:02 AM
 

Not to get drawn into another 4-stroke debate on a 2-stroke site but what riders in SX even run a rekluse?  I don't see a single top rider running rekluse stickers.  But the entire track can be ridden in pretty much 1 gear, especially with a factory transmission and their longer 2nd gear.  It wasn't THAT much different with 2-strokes either, on a 250 you only needed 2nd and 3rd. 

Here you go, holmes.

http://www.vitalmx.com/features/Auto-Clutch-for-Supercross,3257

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Offline Shawn36

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« Reply #10 on: March 28, 2012, 10:11:26 PM »
Ehhh..  I get your obvious point that you think riders and bikes aren't what they use to be but that's reaching.  I'm not going to assume your experience level or speed but on a 250F a SX track is still tough ****.  You need all kinds of clutch to make new style rhythms and triples that are right out of turns.  The only advantage that gives Lemoine is if he falls the bike will free-wheel.  Even on a 450 you need the clutch to seat bounce over some things.
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Offline motoman356

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2001 CR 125 Engine options
« Reply #11 on: March 28, 2012, 10:17:58 PM »
Quote from: Super Trucker on March 29, 2012, 01:10:35 AM
The 1990-97 motors where good,the 05-07 has a stronger motor 5 more hp,and has the same peak hp as a 2012 ktm 125.

the 05-07 or 2002 or newer did make about 34 hp on top. but dont get too excited just because it makes as much as a new KTM its like saying a dolled up girl is better than a model with out makeup. The old cr only made good hp in a very small range. like 10,000-11,000 type range meaning you had to tap dance on the shifter and clutch. the Older ktms like 03-08 made 35 up to 38hp! thats what 250fs make NOW. the newer KTM is possibly the absolutly best 125 motor in that its a mini 250 in the way a YZ is but with more grunt. true it only makes 34 hp but it makes so much more bottom and mid.


as far as a rekluse clutches a pro would very smart to run them so that when they do fall over they dont have to drop a few laps tryin to restart
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Offline Super Trucker

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2001 CR 125 Engine options
« Reply #12 on: March 28, 2012, 10:19:32 PM »
ST I didn,t know you had a roller. I tried to find out if my 06 cr125 engine would fit into my 04 cr125, I never got an answer. So I looked everything over,it looks like it would work.I did forget to measure the swingarm mount tho. Until I swap motors,don,t know if it will work. The pc pipe on the 04 bolts on the 06, strange but the 06 pipe will not work on the 04. FYI you will need the ignition also,with the stator. There could be a problem with the airboot, the swingarm mount is the engine mount that you can,t change,I would check that 1st. The next time I,m at my bikes,I,ll get that measurement for ya,the weather here is bad right now.
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Offline luthier269

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2001 CR 125 Engine options
« Reply #13 on: March 29, 2012, 03:46:17 AM »
Go to on the pipe racing he knows all about cr125's his son raced a 2001 for years. To bad he sold the spare motor out of it cheep!  http://www.onthepiperacing.com/
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Offline Super Trucker

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« Reply #14 on: March 29, 2012, 08:06:43 PM »
Lee from on the pipe racing, is a trip and a huge 2-stroke nut. His kid got alot faster, the last 2 years he,s been on a yz 250 in expert class.
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