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Found 74 results

  1. I bought a new chain and sprockets for my 04 cr125 and I cant figure out how to make it fit. Its too long so I was going to take a link out but then it'll be too short. Ive moved the adujster blocks from all the way forward to all the way back but it won't work either way. Chain and sprockets are all stock sizes.
  2. So I bought this bike about 2 months ago .. noticed a small leak where the exhaust manifold and expansion chamber meet the head mounting studs.. seems to progressively get worse as I ride as I notice more smoke. so I pulled off my pro circuit pipe and my exhaust manifold and I noticed the top stud is super stripped (the nut just keeps spinning on the stud). I am wondering how I can get this stud out because it seems to just be a stripped stud and it will not just turn out with vice grips.. and are there any recomended studs or sealers I can use ? Also how am I going to screw in the new stud without damaging the threads ? As you can see I don't have enough room to put 2 nuts on and screw it out as I tried that !
  3. does any one know why my cr125 keep flooding??
  4. Backstory: 2003 cr125 piston siezed during mud race. cylinder replated, fresh top end, all back together and bike rips well but looses coolant out exhaust. Fast forward 3 years and 3 complete gasket sets later and found out that the replated cylinder had a crack behind the inner power valve axle stay, so it was loosing coolant out the power valve. Now: new oem cylinder and head, fresh wiseco piston, carb rebuild, air filter, fresh silencer packing, and now the bike starts and runs well but bogs soooo badly off idle and when i crack it WOT. feels like its misfiring. it rolls on power okay if i roll onto the throttle slowly. Im at a loss. So far I have changed out spark plug, checked correct piston orientation, checked correct PV operation, Jetting is currently 410 main, 37.5 pilot, needle 2nd cip, AS 1.5 out. I don't know what to do with this bike. Can anybody suggest anything that I haven't tried yet? I want to get this bike back on the trail
  5. My 1989 cr 250 flutters at high rpm. It sounds like your holding it at the rev limiter when your just getting to the meat of the powerband like 4000-5000 rpm. Has new reeds, powervalves have been checked, carburetor rejetted and has new top end with 180 psi of compression. What could cause this?
  6. So I have an 07 cr 125 fouling plugs before the bike even has a chance to warm up, plugs come out wet and oily on the tip. had both crank seals replaced last season because my main drive side seal blew. While it was split I had a new crank put in, we noticed my cylinder plating was pooched so I sent my cylinder off to be re-plated, put a new piston in the shiny new looking cylinder put the old warped head back on and called it a day. then rode it all season having absolutely no idea about the warped head because I overlooked it when I was excited to put my bike back together and ride. Its now winter, snows on the ground. I recently went to go for a put and fouled a plug before I could get to the end of the street and back. I was also smelling coolant so checked the rad while running the bike, lots of movement and tiny bubbes. Pulled the head off and sure enough it was warped to the point where I could rock it back amd fourth on the mirror and see a small gap... so NOW after I replaced the head my problems persisted and I can still see little bubbles swirling around vigorously in the rad if I rev it with the cap off, I've had boiled it down to my cylinder probably being warped then I found a leaky hose by the exhaust that was dripping coolant onto the outside of the exhaust port. Which brings me to what I think may be an incredibly stupid question, could it just be the loose hose sucking in air that is causing my rad fluid to have small bubbles in it? And maybe im just experiencing increadibly rich jetting now that my head is actually sealed properly? over and out.
  7. Hi, I am part of a senior design group to round out a mechanical engineering degree. Our project is to design and build a generic motor mount for a shifter kart that uses 125cc 2-stroke dirt bike engines. one of the motors we would like to accommodate is the CR125. We are looking for measurements from the crank case for the width of the mounting brackets both for the frame and the swing arm. The two mounts we are using specifically are the swing arm mounts and the rear frame mount on the bottom of the crank case. We are having trouble finding a motor we can physically measure and are turning to forums to see if we can source this measurement data from people who own or are working on a bike with one of these engines! Any help is greatly appreciated!
  8. Hi all, long time lurker first time poster. Hoping someone can help me out with an issue on my beloved 02 CR125. I bought the bike last year as a total basket case and made a winter restoration project out of it. Got it looking and running pretty good. Bike has cylinder porting, V Force Reeds, Keihin PWK air striker carb w/JD kit, FMF Fatty and Turbine Core exhaust. Otherwise it's mechanically stock. I only ride MX with it. I put my first 20 hours on the bike after the overhaul pretty much without incident. Then one day I opened the carb to lean out my jetting, went to the local practice track and on my first lap on the first big tabletop the throttle stuck wide open in 3rd gear I crashed pretty hard shortly after landing and hurt my knee which cost me a month off the bike. I blamed it on a worn out throttle tube and the carb spring grommet not being properly aligned, so I replaced the throttle tube and fixed the spring. did another 13 hours on the bike and it ran fine, no more issues. Late July I put in a new piston and changed my jetting again to prepare for a race. Did a few practice laps and the bike worked fine. Then during my first Moto on the fourth lap I went off a ledge jump into some big braking bumps, throttle stuck again through the bumps and I went over the bars, me and the bike got pretty beat up, cost me another three weeks off the bike. When I went to pick up the bike it was still revving at full throttle. This time I replaced the throttle tube with one of those metal ones with the bearing at the end, new throttle cable, and a new carb return spring. Rode it around my yard and it worked fine. Went to my local practice track and once again, first lap, same tabletop as the first time, throttle sticks open, this time I was ready for it and pulled in the clutch. Brought the bike to a stop and it it kept revving off the limiter. I could move the throttle back and forth, but it had no effect on the revving. I opened the throttle all the way to the stop and let it go and it snapped shut and the bike went back to idle. I'm completely lost at this point as to what to do, I've ensured the throttle cable isn't getting pinched anywhere and have replaced everything I can think of. I even put my needle in a drill and spun it, looked straight enough to me. Guy at the dealer suggested an air leak somewhere in the crankcase, but every air leak I've seen makes the engine rev high at idle, but once under load it works relatively normal, just a little lean,this is full power open throttle. When the throttle isn't sticking the bike rips pretty hard, loads of fun. I have a new 17 CRF250R that I've been riding since I'm too scared to get back on my 125, but the 125 is a lot more fun to ride. My wife wants me to sell it, but I can't sell it to someone in this condition, don't want them to get hurt. Every time this has happened I was 3/4-full throttle going off a jump face in third gear, shortly after doing work involving the carburetor that's the only parallel I can draw between all three instances. When I overhauled the bike over the winter I completely rebuilt the carb and it worked fine, so I'm not clueless when it comes to carbs. Does anyone have any other ideas as to what I can change to fix this issue abs get my little ripper going again? Thanks.
  9. So, I am about to embark on a major tear down of my 2006 CR125 and have one more "problem" that I need to resolve during this rebuild. My clutch is a pretty firm pull and it fatigues my forearm pretty quickly. I'm not sure if that's simply how it is on these bikes, having pulled the clutch lever on other bikes such as the yz125 and rm85, my clutch is very hard to pull in comparison. I just replaced the cable with one that the guy I purchased the bike from gave me, so maybe not stock? Would that make a difference? Also, could it be my springs? I've never had problems with the clutch such as lurching and the clutch is smooth, just hard to pull. Thanks, Will
  10. Hi there ! I'm currently looking for a used 125cc 2 strokes between 2000 and 2007. ME: I'm form Québec/Canada, I'm a 5.4 foot tall, i weight 130, i mostly ride trails(on dirt, sand, rocks) but i really like to jump, climb on some small rocks(a bit like trial) , and i do ride enduro style too. I CURRENTLY RIDE: an XR200a 1984 (with absorber) i really like that bike, it's undestructible and i can ride for ages with one tank. The downsides are the suspensions and the speed limit. I WANT: a light, 2stroke, 125cc, which i can use all around. I want to pay max 3000$cad. I did some research and found that the YZ 125 is a pretty notorious bike, and more notorious are the 2006+ because of the suspension, motor, weight, improvements. That being said, i'm not close for any other brand. The one thing i'm concerned with is the gas consumption. I can do 2, 3 rides with my XR(4stroke, of course) before it got bone dry. I don't ask for the same results but i just don't want it to run out after 1 1/2hr -2hrs ride. I would really like a bike i can easily find parts. During my reseach i fell on a steel vs ali frame thread, i'm also concerned about it. Being a Vintage dirtbike rider ATM i can say i love the way it feel. I tried my friend 2017 TE300 and it was great but it felt like the bike was SOOOOOO DAMN STIFF !! OMG, myself being small and light, i wasn't comfortable AT ALL on it. I don't think i could see a difference between a steel and an ali frame and i wonder if i could see a difference between 2002 Yz vs 2007 YZ's suspension too ?? HOW MUCH should i pay for a STOCK bike between 2000 and 2007 ?? (i know there can be that bike which as been redone and all, but just overall stock ) Anyway, i probably forget to write some lil thing but overall this is it, i'm looking for a 125, 2t !!! Thanks you very much for your time ! have a nice day
  11. Hey, I picked up a 96' cr125 off Craigslist for pretty cheap. Learned my lesson from my last two stroke- gonna do a rebuild before I crank her up again... Anyways, pretty sure the bike has "piston slap" noise coming from the motor. I looked it up on Youtube, sounds like what it is. Is there anything special I need to know before I do a top end? I'm still a fairly inexperienced mechanic, but as far as I know, I need to get a bore-measuring tool and measure the cylinder bore before I buy a new piston. They make slightly oversized pistons for this kind of situation, right? I'll post pics sooner or later. Just gonna keep digging this thread up. Let me know your thoughts! *Edit*- The bike can roll in second gear. Noticed it when I was buying the bike. When I pop it in gear to rock it back and forth before I start it cold, it'll just roll through and you can hear the engine turn over. My guess is this is a symptom of a roached top end.
  12. Bought myself a 2005 cr125r in good condition to switch up to 125 class from 85. Anyway I've got the bike jetted nicely it idles runs perfect brand new top end but now I've decided i wanna make some more horses. I don't have complaints on the power but i feel like the powerband kicks in a little too smoothly. currently on the bike is Vforce 3 reeds and cage, stock pipe, stock carb, R304 shorty. I hear the long style DEP silencers and FMF SST pipe are a great combo for top end power but i want some feedback before i buy anything. i was also considering some carbontech reeds either the 106mt/106ht but im not sure if they will fit in the Vforce 3 cage. If anybody's used these let me know how they are. im trying not to send off the engine but i hear raising exhaust ports and milling off the base works wonders but im also not trying to spend more than 5$ a gallon on gas lol. im open to any ideas thoughts whatever just let me know what you guys think is best for some 2/3 and up power!
  13. I've got an 01´ cr125 with the stock mikuni TMX probably the 36mm, i just got the bike. I've been riding it for awhile now and i can never get the idle to be set up right, and the power delivery seems very choppy. I just don't want to get lost in jetting with it because everyone just says its not worth it to try and get these things perfect. can anybody direct me to a forum that has information on the best carburetor to run on these for motocross? I think i'm leaning towards the PWK airstriker but which one? I would spend the money on a lectron but i would like some insight first I have the mechanical ability to re jet this carb everywhere i go but i don't really want too, i know you still have to adjust the PWK but i've heard it not as much. i'm going to ride it how it is right now because i'm not super picky, but i'd like to get into some racing next year and im saving up money to invest into my bike, i feel like the only thing on it that isnt quite ¨race ready¨ is the stock carb. some insight would be awesome! thanks -Devin bianco, 15y/o, not a good rider yet but trying my best to learn
  14. I've got an 01 cr 125, I bought last summer for my fiance and I rode it a bit and it ran terrible. I got brand new fmf muffler and pipe with fmf's recommended jetting. Didn't run as good as I thought yet, So I tried different oil and higher octane fuel. Right now I'm running golden spec with 110/93 making 106 recommended also by fmf and it still doesn't run top notch. Running half ass and is spewing oil from the muffler and headpipe and not like the average 2 stroke. Someone was telling me the 01 had alot of issues and to grab a carb off a 98? Not sure if that's worth it or not? I'd love to get it running good for her while it's still winter. Thanks in advance.
  15. So i'm doing a rebuild on my 1997 cr125 and the connecting rod has free play going side to side and up and down and I would like to know if i can just buy a new bearing for the rod or I if need to do a complete rebuild of the bottom end? Any help would be appreciated.
  16. Hey guys so I recently got an 02 Cr125 and I noticed it had a pretty decent leak in the front where the exhaust connects to the cylinder. I saw the little oring was shot and I honestly don’t know how to install the new one correctly. I attempted to and I broke it sadly. If any of you know how to install it please shed light on it for me! Where is the oring supposed to sit? I can’t figure it out?
  17. Hello, I'm sharing this video from a recent conversion I did on my bike. I tried my best to film, explain, then edit the video into a some what coherent stream of discussions. I've never made a video like this, nor have I ever done a conversion before. I'm sure there were a million better ways to produce a video like this, and probably 100 better ways to do this conversion. However, this was not the point of the video. I truly want to help anyone who is just trying to figure out how to squeeze a little more fun out these bikes while challenging our abilities of modification. I could not find a "how to" video any where on the ol interweb, so I thought I'd throw my ugly mug on one. Please enjoy. Crf 100 to cr 80 fork conversion . 100 is a 2007 and the front end from a cr 80 is 92-95. I re-used stock bearings on the 100 steering stem. https://youtu.be/lsK4ReU2rk8
  18. Does anybody know of any wireless headlights that mount where your number plate goes where you don't have to wire anything? Kind of just like push a button and it turns on type of light thing? I would also need it to fit my 03 cr125. Thanks for looking!
  19. Hello all, I have begun the tear down of my recently purchased 2007 CR125. It has been ridden once since I purchased it. The piston is about to go (approx 50 psi on compression test). I have already submitted a few questions on TT, but thought it would be easier to pull them all into one thread. Here are the most recent threads about the build and from here on out, I will just post questions and relay my progress here. The other day, my son removed the engine as we are going to replace the top end (still stock OEM, engine has never been opened). Naturally, I have to clean the entire bike now since the engine is out, but that is a bit later. While I am replacing the top end, I am going to go ahead and replace seals and all gaskets (minus splitting the engine). As I was starting to tear down the engine to look at the condition, I notice that the fly wheel has some rust on it, which is not good (see pic below). Question is, should I just try to remove the flywheel, clean it up really good and reinstall or replace it all together? It seems mostly surface rust. It looks like maybe some moisture got in through the cracks in the rubber wire cover around the case boot area (see pic). I need to address that as well, but it appears the only way to fix it is to get an entirely new wiring harness which is $400!!! Any thoughts and comments would be greatly appreciated. Unfortunately, I will be away from the bike for 10 days (Traveling to Ireland), but plan to put together a shopping list from RMATV and/or Partzilla during the long flight over so the parts will be waiting for me when I return. More progress to come!!
  20. Hello, I'm having a couple problems out of my 2000 Cr 125 that I recently picked up about 2 months ago and wondering if anybody could help maybe point me in the right direction to fixing these problems. 1.) Little to no power in first gear (won't even pull front wheel off ground) 2.) When holding the bike in the powerband it will "kick in and out", out more then in though 3.) The bike is blowing quite a bit of splooge from all the exaust connection points and even dripping on my rear swingarm, I've tried changing my mix ratios from 32:1 to 36:1 to 40:1 and the problem still persist so I just stuck with 36:1 Also can't find an exact answer on what compression the bike is supposed to be running at. I recently compression tested it and it read at about 120. I've read up on these problems quite a lot but everybody says something different, everything from jetting, reeds, top end, ect.. Any sort of lead in direction would be highly appreciated!
  21. Hi there, Sorry if this is a silly question but I have just fitted a dg ehaust to my 74 cr125 and just wondered if any one elses is quite tight to frame and sump plug? If i push the front of the pipe against the springs (side to side) it can hit the frame and touch the sump plug. Is this right? Any advice or pics really appreciated. Thanks Kirk (uk)
  22. I recently purchased a 1997 Honda Cr125, i was riding Monday when all of a sudden I lost all power, it bogged and then stalled and would not start .. before hand I have done all general maintenance (clean carb, new filter and oil.) so I took the top end apart right away and found my piston got mangled by what looked like a piece of spark plug or rist pin.. the cylinder has a deep score down the side all the way from top to bottom from the mangled piston ring also. So I have the cylinder out to get machined to stock bore and of coarse will get a top end rebuild kit .. what my worry is, is the bottom end ... I checked my connecting rod and as I turned it I noticed tiny little metal fragments on the crank shaft not many but some, also there is lots of left-right play but very little up and down with my connecting rod. I drained my oil and checked my magnetic drain plug and noticed more tiny metal fragments. I'm wondering how big of an issue these fragments are as I would rather avoid taking apart bottom end and paying a lot more ... and also how much left-right play is the connecting rod supposed to have ? All opinions appreciated !!
  23. Hey I had an exhaust leak where my expansion chamber slips on the manifold on my 97 cr125. so I installed new studs and nuts and bought 2 new seals for the manifold as I pulled two off. I was wondering how many seals are actually supposed to be on the manifold before I put it back together? On manual diagram they show a seal but not how many. There were two on there when I pulled it apart (one on the bottom and one on top of that one)The bottom one is worn i have two new ones just incase and also bought versa Chem exhaust joint and crack sealer (high temp) to make sure nothing gets by ! Any help or suggestions would be appreciated! Thanks
  24. I have been on the hunt for a clean 05-07 CR125 for some time now and stumbled across one near my home. Asking price is $3500 and the bike is damn near showroom CLEAN. Seller claims it has about 15 hours on it and looking at it I believe him. Completely stock other then a PC pipe and silencer and some Flexx bars. The highest dealer value I saw in either KBB or NADA is $2200 but I will admit that sounds low for the condition of the bike. I am thinking $3000 tops. Am I crazy or does the $3500 asking price for an 11 year old 125 sound a bit out there?
  25. Hello, I am new to this forum and i am looking for an advise. I recently bought Honda CR125 2001 in pretty good condition, the only problem i got is that the rear caliper which has been replaced from different motorcycle and i can't seem to find the proper brake pads. I've been looking for used rear calipers for my Honda but they are hard to find. My question is if it's going to be possible to fit rear caliper from '02/03/04 CR125/250 to my CR125 '01?
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