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Found 212 results

  1. Picked up a 05 yz125 recently and I have noticed it accelerates quite hard but maxes out quickly. It has 13/50 gearing and I was wondering how much of a difference going to either a 13/48 or 14/50 would make, could go possibly taller gearing. Cheers
  2. Hey, I have a question. But first let me tell you that I am new to dirt biking, so I don't know anything. I purchased a 2001 YZ 125 in October and the seller said that he just changed the Piston and Clutch. I took it out in Gorman (OHV Riding Area) and like I said I am new, so I kept stalling the bike because I was learning and just let go of the clutch. But then when my dad got on, he said it is my fault for just letting go of the clutch lever, but also the clutch plates are a little bad. I can start the bike, let the clutch out 90%, and ride. Like shouldn't it start to move when I am half way of letting go of the clutch lever? I've seen videos of people holding their clutch lever half way and are moving 10-15mph. I can ride it perfectly fine now... But just wondering, what's wrong with it?
  3. Please help! I recently bought a Yz250f and have not been able to start it, it Has spark, but there are many issues with the carby which I wanna rule out before I leap into a rebuild, ( I want to avoid a rebuild if possible as I’m low on cash). The carby at the moment is a complete mess so the usual steps to fixing it might not work. So here’s the deal with the carb: - It’s leaking fuel from overflow ( really fast! ) and when I mean really fast, I mean it emptied my fuel tank in 2 mins. - It has a slow leak coming from somewhere under the float bowl - the air fuel screw is not adjusted correctly - I don’t know if the electrics work on it either - I don’t even know if it’s shooting fuel into the cylinder or not, as after kicking it a couple times and it’s not starting I remove the spark plug and it’s still dry. ( I tried putting fuel directly into cylinder from the spark plug hole but the bike still wouldn’t start) okay so I know it’s a lot but I’m not expecting anyone to answer every single question themselves. If each person could tackle whatever problem they know it would help heaps. Also just want to know what Order to fix things in as I can’t do air fuel until the bike is running and it won’t run unless I stop the leaking and get it to spray fuel into the cylinder. And buying a new carby is not an option ( I’ve got $40 to my name atm). Please help guys thanks.
  4. Hey guys I could use some help here. Long story short I have a bad motor, breaks in the case by the water pump (looks like the last owner jb welded a a piece back together and it failed) anyway, the year is a 2001 yz 125. I’ve had the bike a year and a half and never got to it. The crank bearing spun and the crank is stuck. I’m sure I could split it with enough effort but for now I want to just buy a new bottom end with a good crank and bolt my 2001 head on. Im aware of different shaft lengths and pistons on closer years but I can’t come to a conclusion on which years would be good to match up. If I could just find a 2001 bottom end I’d go for it no questions asked, but of course it’s hard to find an exact year. I see a couple 98s and 2002 bottom ends for sale. The real question is what years are compatible where I could just bolt my top end to another year with little to no modifications? At this point I want this bike gone for the space. I have 4 other bikes so some shelf space would be nice! I would really appreciate some feedback. Thanks
  5. im am 13, 100 pounds (with gear) and currently ride a 08 yz85 and am looking to move up. first off im not rich and i have to pay for my own stuff, i am not going to be racing i mainly just ride track and trails here and there also some desert sinlge track. i am debating on witch i should get next a yz125 or a yz250f. i can handle the power i have riddden both a 125 2 stroke and a 250f and i basically fell in love with both so i am in a predicament on what whould be best. anything helps
  6. I just got back from a weekend of riding and noticed my fork seal leak got really bad and is dripping oil. I am going to replace it but for now is it bad to ride on bad fork seals? For when i replace them how much can i expect to spend on supplies if I do it myself, and how much will a shop charge me
  7. I am looking for a YZ125 and have found a 99 for 1300 and an 03 for 1600 both in pretty nice condition. Obviously going to negotiate the prices down however I was wondering which one you guys would suggest. Ive been doing research and know that the 03 is lighter with a modified frame though it has a 5 speed. The 99 motor is well liked for the power and reliability. I will be doing strictly trail riding so whats the better option here?
  8. I got a full engine rebuild done 3 hours ago now there's scratches on the piston by the exhaust port. What could the cause be?
  9. I just recently went with a friend to purchase an '01 YZ125. The bike had just had an engine rebuild and a clutch replacement. I'm new to two stokes, and this is the first one I have ever ridden/worked on, so this is all new to me. When we were in the process of test riding the bike, I noticed that every time we fired it up, pulled the clutch in, and shifted into first gear, the bike would stall. The (previous) owner had said that the bike probably wasn't warmed up yet, and "sometimes" did that when it was cold. I had to give it about quarter throttle when I shifted into first gear to get moving. I also noticed the clutch was pretty stiff, but that could be due to new springs? The bike shifted through all the gears fine, and the clutch seemed to work when I shifted back into first and came to a stop (bike didn't stall). Any ideas on how to fix this? I'm going to disassemble the clutch and check it out. We just got the bike, so I haven't done much testing/diagnosis yet. All I know is that my four stroke never stalls when put into first, even if it's not warmed up at all.
  10. Well guys, I officially pulled the trigger!!!! I have been looking for a bike non stop on craigslist for about a year now....I just CANT justify spending 7k on a brand new machine. About 3 months ago I bought a project bike for 500 bucks and realized it was gonna cost way more to fix it than the bake was worth...it was a 2001 Yz125.....so I resold it, didn't lose any money on it, and kept looking....Well last week, I FOUND A GEM THAT I JUST COULDN'T PASS UP!!!!Went and picked this puppy up today for 3,500.00 bucks. 2015 Yz125. Dad bought it for his kid 2 years ago, who rode it for 6 months around his neighborhood, broke his wrist, and then never touched it again. Has about 40-50 hours on it I was told. What do you guys think??????
  11. When my bike is not running, I noticed if I put my bike in gear and squeeze the clutch all the way in and roll the bike, the clutch is not fully disengaging and it is turning the engine over. Last week I took it out for a ride and noticed I also cannot start it in gear without giving it a good amount of throttle and if I stop in gear with the clutch squeezed all the way in, the bike will stall. I have no clutch slippage issues or any other problems I can recognize other than the clutch not fully disengaging. I figured it was likely a stretched cable and they're cheap so I put a new motion pro cable in this morning and adjusted it properly and I'm still having the same issue, I have not rode the bike with the new cable but I put it in 1st gear and tried to roll it with the clutch squeezed all the way and it was still turning the engine. What else could be my problem???
  12. I have a 2003 yz125, it’s excessively dripping oil out of the silencer and where it meets the exhaust, there’s a lot of oil, it’s throwing out huge amounts of smoke and starting to foul out plugs. I’ve already replaced the clutch side seal (I’m almost positive it’s coming from the transmission oil) and repacked the exhaust. After that it seemed to stop or at least slowed down. After sitting for a couple months I changed the transmission oil once again and started it up, I let it warm up and didn’t feel like it had the normal amount of power and kinda bogged down, we revved the hell out of it and it cleared up and felt normal. We loaded up and drove out the the desert and I started it with the choke on and let it idle, after about a minute it died and wouldn’t turn over at all. We came back home and took out the spark plug and it was fouled replaced it and it ran again. The next day the same thing happened. Any thoughts on what I should do? The engine was recently rebuilt and I only use it for trail riding and run about a 40:1 ratio. Thanks
  13. I’m 12 years old about to be 13, I stand at 5’8 and weigh 147 pounds. I race a yz85 and I feel like the bike is very small and I’m too big for it. I also feel really big on the supermini/ big wheel. I don’t know if I should get a 125 or a 250f or what. Please leave some feedback on if u think I’m too big for a 85 and am ready to move and and which bike do u think i should get?? (I’ll throw in some pics of me on a 85 and me on a 125) (the first 4 r me on a 125 after that it’s me on 85))
  14. Hey guys it's me again. I just want to say that I am 6 feet tall but my YZ125 is really big and I can't really put my feet down. I can touch the ground (like tippi-toe), and I can fully put one foot down if I lean. Is that okay or should I downgrade?
  15. Not that many things on here regarding fuel and the Yz125 specifically. Locally, I can only get 91 octane ethanol gas, which is not what the manual calls for. It calls for 93 or higher......I have two other options each about 20 miles away....one is 93 octane ethanol gas from the pump, or go to sunoco and get 110 octane ethanol free......Any thoughts? Keep in mind, my engine is stock, and I don't plan to mod it out a whole lot in the near future. Any harm to running the 110 gas?
  16. I have a 2000 yz 125 with all stock plastics and im looking to get a restyle kit to make it look a bit newer, any ideas what kind of kits there are to get closer to the newer models?
  17. Hello, My name is Dan. I recently bought a 2001 yz125. I have been having jetting issues that i cant seem to fix. I have rebuilt the carb, tried a JD Jetting kit, and new reeds and nothing is working. I am looking for someone in the Central Jersey area who is willing to help me work on my bike and get it running strong. I have all tools necessary. I would pay $25 dollars per hour. This is completely legitimate. Feel free to text me at 908-448-9639. Located in Central New Jersey
  18. Ok guys, new to the forum and wondering if anyone has some tips for my bike. 02 yz 125 stock bore . bike used to foul plugs all the time no matter in trails or riding hard on the track. fixed that with a friend we took the carb apart and re jetted cleaned etc. bike started bogging and cutting out a lot but plugs were always great color. he suggested float height was off so he fixed that and the bike was running great . about 10 rides since the fix with it running good , but went ou today and 2 seconds into riding bike stalled . wouldn't start checked plug it was perfect color put a new one in and stared right up but kept bogging and stalling all the time . checked plug multiple times and it was good. always riding hard even in trails or would be in 4th on the track and would just bog out. breaks up sometimes in high RPM too. Anyone have any ideas just sick of it at this point . all help is very appreciated thanks.
  19. I am 14 and 5,3. I have a fully rebuilt mortar and suspension, It is purely a racing bike. I have convinced my parents to let me race. I am comfortable with my bike and have always wanted to race. Now I need to know how to prepare and what to practice. At my local MX track they do live starts. Thanks for your feedback!
  20. just got a new bike and would really love to get into racing
  21. My 2 stroke fouls plugs pretty often and it sucks! I use NGK How how often do plugs foul normally? Thanks!
  22. So when I bought this bike it had mix match plastics and I was wondering if some were restyled so idk what graphics kit to get, what graphics kit will fit these or will i need a whole new plastic set?
  23. Farting around in Jeff Spicoli checkerboard Vans, almost loopin' it out for the camera. How I didn't, I'll never know...
  24. Hi I am 5”10 145lbs I have owned yz250f ktm125,rm125, I just ride trails and logging roads for fun and abit of single track I still consider my self a beginner rider. I am wanting to buy another bike I sold my bike last year but there is not a lot on the market rn in the 2500 dollar range I would like another 125 two stroke but not much out there. I found a yz250 for a good price but I don’t know if this is way to much bike for me last thing I want to do is get hurt... it is that much more to handle then a 125 ?? thx for the advice.
  25. I´ll keep it short, i want to spend about $3000 on a 125 used 2t bike. Should i consider buying one from around 2006-10 for like $2000 and sticking money into it, assuming its going to needs a new top end, pegs, levers etc. Or do i go with a more expensive bike thats maybe a little newer and not spending a ton on it. if i were to go with a bike that was a little older, what brands and years were known to be pretty good? i think with a newer bike id go with a 2015+ yz125 anybody got any ideas?
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