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Found 197 results

  1. Hi all, I have a question that i haven't found some clear cut info about. Id just like to hear it from the community.... my mate and i are honda CRF boys , and sadly when we were recently on an out ride in the South African landscape, his engine came to a halt & seizure! what a day it was getting the bloody thing back to the car! Anyway we are young adults at uni who dont really have a lot of mony spare! we managed to find a way to rapidly replace the bike and to save money. We found a running 2004 yama yz250 2t and the guy traded us a seized 2005 crf250 for this- he specialized in chop shopping Honda and obviously saw value in this trade. it obviously came with its quirks.... this yz250 has: -1998 yz 250 motor -CDI from an 80cc yz When we first took the bike to the track it would not start. I noticed the following: -small holes in the expansion chamber (a few, none bigger than the tip on an Aux jack)- what is the impact of these small holes on the bike? ( i will use fire-gum to fix) -muffler does not tightly fit to the end of expansion chamber. FYI, fuel mix was 50:1- recommended by the oil we used- i have been told that old Yamaha are better with more oil? 25:1? So leading up to my question: when we eventually got the bike started (Bump start) it really ran lumpy, and bogged when the accelerator was pulled and eventually died. when i get the chance to look at the bike, what is the impact of holes in an expansion chamber?- could this be a reason for starting and power issue and bogging under acceleration?? Could this be because of a CDI from an 80cc? Could this be Fuel Mix? Spark Plug? apart from those questions, i am going to change the spark plug anyway- i can assume that maybe this could be due to a faulty plug?- maybe?? anyway, this is what i know. perhaps you guys would be able to add to my theories or tell me something more that i could investigate? thanks, Luke
  2. I have a 2009 yz250f with Hot Cams and it is in dire need of a valve adjustment takes about 30 kicks to start and I am planning on doing it myself I just need the correct valve shim kit and I don't know what size kit to order so I was hoping some of you guys could help me out, and the bike has a big bore kit so it is 290cc idk if that matters but please help!!!
  3. 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?
  4. 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.
  5. Took this bike out for a ride and while riding it i noticed it was very snappy on throttle and honestly uncontrollable on slick hills, etc. the hit was so much i was scared of flying into a tree. Like some of you might know i am used to the 4 strokes power roll on and how its super controllable response. So how can i make the throttle/bike more controllable so i can roll the power on smoothly. Basically make it feel like a 4 strokes throttle in a way? Also i will be adding a 9oz fww to the bike after a few more rides to determine if its needed for me or not. I read a few articles online before coming here, saying to retard the timing a few degrees. 1. I am very unfamiliar with most motor work as in gaps, head mods, etc. Also heard changing to a G2 throttle might help but has anyone used it on a woods bike? Just let me know what you guys have done to knock the mx hit off the yz for woods below!
  6. Hi All, Trying to start a suspension collective, Year and Model Valving (Factory Connection, Racetech, stillwell, etc.) Class (AA, A, B, C) Terrain Weight Springs Rider sag Clickers Comments on feel Ill start 2016 YZ250X Valving - Stock Class - C Terrain - New England woods, single track and hare scrambles Weight - 200 lbs of glory Springs - Shock 5.6kg Factiory Connection , Forks 0.46kg Factory Connection Rider sag 105mm Clickers - Front Comp 15 out, Rebound 15 out - Shock Rebound 14 out, High speed 1 and 3/4 turns out, Low speed 11 out Just changed settings as the factory 12 and 12 were too stiff for the roots and rock gardens. Felt amazing in the turns and on fast and flowy. Just upgraded springs to weight appropriate - will update once I ride Wednesday.
  7. This is the saga of my poorly maintained 2003 YZ250 that I bought about a year ago. I added a few mods last summer to help me get by then deployed to Africa for 6 months. The poor bike was riddled with SAE hardware, spray foam where there should have been gaskets, and ziptied rear fender, a horribly cut seat, and plenty of other unspeakable things. However, it came with a title and the engine did run pretty strong at the time...even though it had a hint of engine noise. Over time, the noise progressed and I knew what had to be done. While I was away, I coerced my wife into sending a used crankshaft i bought out to Mr. Crankshaft so I'd have a spare for a quick swap... This is it after I replaced the fuel tank that had a split in it and put a lectron carb on. It still wasn't that smooth and the wheel/tire combination were unforgiving, plus, the suspension and rebound were set for a wanna-be-freestyle MX rider. This is the transition to where it was before I really dove in GT216AA Front with Nitro Mousse 18" Rear with Shinko 505 Cheater rear and Nitro Mousse Low Enduro bend Flexx bars (eventually putting steering dampener on) SSS Forks and suspension done by W.E.R. DEP Armored Enduro Pipe Steahly 9oz Flywheel Weight Devol Skidplate IMS/Zipty tank Non-cracked white rear fender Tall seat...I forget who made it, but it does what it do and fits well. Head cut by 218 (head was cut after this photo was taken) rock kickstand During this ride, I had next to no bottom end due to a stuck powervalve. This was my first ride since I came home. I never really tore into the engine, so I got in there, cleaned it up and replaced a broken powervalve pulley and a few areas where parts were missing from the previous owner(s). Two weeks after this picture, I took it out to the mountains for the fourth of july and it started to get real nasty sounding and not in a good way This is why: While I was in there, I figured I'd send the top end out to Eric Gorr...and since that has a 2.5 week lead time, I might as well get the frame in order. Now my bike looks like this. The frame was spray bombed over who knows what, which was over the the original finish. That is being re-mediated. To be continued...
  8. Hi, Had my '07 YZ250 engine rebuilt about 5 hours ago by a shop which has since closed. Doing an oil change on the weekend I was surprised to see something attached to the end of the drain bolt (10mm socket for reference). It's difficult to identify what pin this is, but I think it could be part of the YPVS Governor. I found another thread on this forum that starts with the discovery of a different pin but also ends up finding one that looks just like mine. So before I start taking things apart, I have some questions: What is the role of this pin? Is it the pin in the attached diagram? If so, being part of the governor assembly, is it likely to be related to a weak top end? That would be my only complaint of the engine when i received it back. Riding this bike back to back with an '08 , theirs felt terrifying. How could it have come loose? Installer error? Should I be concerned it will come loose again? Is there anything I can do to prevent it coming loose again? If it shows no signs of damage, is it safe to assume the internals (i.e. the parts that would require a case split to inspect) have not been damaged during its journey to the drain bolt? If not, what specifically should I check? Lastly this post hopes to serve as a bit of a reference for anyone else who finds something similar. Thanks guys 🙂
  9. Hi, I just found a great deal for an 06 yz 250 online, and was just wondering, if I'm about 5'10, how would I fit the bike?? I was wondering if I could get two feet on the ground, control it well and stuff like that. Thanks for reading!!
  10. I got a 1994 yz 250 and the clutch is a pain to pull in. Is their any way to soften it up?
  11. 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?
  12. I'm thinking of purchasing a 1999 YZ 250 2-stroke and doing a complete restoration. The main issue is this particular bike has a small hole in the left side engine case. The previous owner states that the gear shift lever impacted with something which caused the damage. I'm having a hard time finding replacement engine case. I've chk'd the obvious online spots and Yamaha doesn't list '99 cases anymore. What years can I swap out parts for? From what I've read, it seems the next engine upgrade came in 2006 to match the aluminum frame....is this correct?
  13. Wow, it's been a few years since I've been on here. Glad to see old farts like greyracer are still on here helping guys out. I recently had an experience that I had to pass along though so I thought I'd log in here and see what's up. I was going through one of my favorite bikes, my "old" '06 YZ450. (I recently rode a couple '17 KTM's and it made me appreciate my YZ even more.) While I was freshening up the suspension, I thought I'd lower it a little bit in the process. I've always been happy with the suspension on that bike so I didn't want to go crazy with big changes, just a little tweaking. Anyway, I needed some shock oil and seals and I wanted to see if anyone local had any in stock. (Something that is getting harder and harder to do. For the local SF Bay Area people, we just lost Zoom Cycles, THE go-to parts and accessories store for the last 45 years.) I do a little google searching and find Dave Johnson of Smart Performance is local to me. I give him a call and sure enough, he has everything I would possibly need for any suspension work I wanted to do. He puts together an order and I drive over to pick it up. I'm greeted by an obviously VERY intelligent, articulate, helpful and nice guy. I show him what I'm doing and he gives me tons of ideas and suggestions. I leave with everything I would need to build the shock and fill it with oil and nitrogen myself. The next day I realize that having a guy that's done hundreds, if not thousands of shock rebuilds purge the oil of bubbles in a vacuum chamber he built just for that purpose would probably be better than me trying to do it myself. I asked him if he would vacuum and charge the shock and he said no problem, bring it down! When I went back to have him do the shock, I also brought my fork parts to ask him about lowering ideas. Again, he gave me a ton of excellent information and some upgrade parts to put into the forks in the process. I left with a filled and charged shock in my hand that I had 100% confidence in it being filled perfectly with all air purged properly. I then spent some time on my lathe making a couple spacers for lowering the forks. Just for the h#ll of it, I thought I'd send him some pictures of what I came up with. AGAIN, he gave me his invaluable input and suggestions and it pushed me to make another set of spacers that I could be absolutely positive would work perfectly and dependably. I'm generally a pretty independent thinker and worker. When somebody influences me to be BETTER than I think I can be or do, that impresses me A LOT. Dave's suggestions and thoughts "pushed" me to do a better job and come up with a better final solution. For that, I wanted to return the favor by letting everyone know my personal experience with Dave and Smart Performance. I know this won't come as a surprise to many here, but I just thought I'd share anyway. I'm a HUGE fan of smart people openly sharing knowledge, and Dave is absolutely one of those people. Thanks Dave! John (aka gmtech16450yz everywhere else on the web. Google search that or "john's sky redline".)
  14. I need to do the forks on: 2012 WR450F 2007 YZ250 Is there a trick to getting the compression damper piece out without that special fork cap tool? Heres what im talking about: 2012 WR450F 2007 YZ250 I rebuilt a pair of AOS forks with no special tools but I think the compression body came out with a 17mm socket. It was off a 2008 KLX450, I'm PRETTY sure top looked like this: Maybe someone can verify that 2008 KLX450R forks have that style of top cap. I cant remember and the bike is not in my possession atm. I dont like buying model specific tools so if there is a trick to getting those compression caps off let me know!
  15. I am rebuilding the top end on my yz250 this winter and need to know what piston to get. I am getting an oem piston and I'm unsure how to identify what piston I need. I believe there are 3 different oem pistons. Anyone know where the identifying marks are?
  16. Ripping around some back roads, seeing what she's got. She's still a got a lot more I know. We'll get there -=D
  17. 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
  18. So i have a 2005 YZ250 and want to do the UFO Restyle kit plastics on it. I know the 2006-14 yz kits bolt straight up like stock ones. The question is, has anyone done the UFO Restyle plastics on their 05 YZ250 and it line straight up with no issues? I wouldn't worry so much but my experience with "modifying" plastics is VERY POOR and i really don't want to deal with the hassle. Thanks!
  19. Hello all! Long time lurker here, great site! Long story short, I pick up a bike with low compression for a little project. I notice "FMF" on the side of the cylinder ask him if he knows anything about it? He replies "the guy I got it from said it was an FMF race bike, but I don't think so. Figured someone just carved that in the side." I have never had my other yz250 apart, looking at the ports and comparing them to the few pictures I have found, it does not seem the cylinder was ported. Admittedly, I very inexperienced when it comes to any 2 stroke porting. Stock rebuilds is how I have always rolled. Also, I noticed the "c12 only" but the head only looks lightly milled, if at all. Any expert eyes out that have some input? I am trying to keep this rebuild reasonable since the holidays are around the corner. There is a gouge in the cylinder from the ring breaking. Last time i sent a cylinder off for repair it was 350ish. If it is a stock cylinder I may try to find a used one in good shape a little cheaper. Any help or suggestions would be great appreciated!
  20. I have the option of either installing SKF bearings or Koyo bearings . I was told by my local parts / Bearing retailer that SKF makes high quality brgs . Koyo have also earned a great reputation being a trusted brand as well . I'm seeking the opinions of the forum on this choice . Thanks for your input on this matter ! Application : 1984 YZ 250L
  21. After only riding street for about 4-5 years straight I went dirt riding the past 3 weekends in a row! Feels great to not have to worry about cops or cars killing you all the time. Plus it feels like I can still ride good and I know how to do stoppies from street riding😉 almost got all new gear too. Couldn’t be more stoked to ride a dirt bike! Just needs to rain.
  22. Im looking at an 07 yz250 today. How can I tell if the forks are from an older model or not? Im getting it mainly for the Sss forks so need to be sure. Thanks
  23. Hi there, can anybody help a newbie with a KYB fork question. Got a second hand KYB forks and are lost, they ned to be overhauled but I can`t identify the year. According the previus owner they where used on a YZ250 2 or 4 stroke? nor the year or if they belongst to that bike. They appear to be closed cartridge type, means they have to be at least 2005 or newer. All help appreciated!
  24. https://www.youtube.com/watch?v=pfIu-RXWiV0 Please tell me how you think this bike sounds? 96hours on it
  25. hello my name is Noah and im 13 years old. im about average size 5,6 120 lbs. i started riding about a year ago (dirt bikes anyways). i started on a 2005 drz110 then went to a 2006 ttr125le and finally to a 2003 crf230f. but ive been looking for a new bike, ive been thinking along the lines of a 2006 yz250f. I've had experience with bigger and big bore bikes (trx400ex, drz400s and have rode them many times). my dad has a 50th anniversary yz450f, and i love the look of it. i have been riding about every day on 25 acres. please give me back some feedback. thank you
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