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Found 180 results

  1. 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?
  2. 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".)
  3. I have a 2006 yz250. It was fully rebuilt top to bottom last winter before racing started rode all year and it was fine the problem I am having after winter start up is starts no problem, run decent, when I turn the throttle smoke and. Lack oil spray out of the silencer like if I put a glove on there's a nice layer of oil also the part of the carb that comes out of the tps and sits on the throttle slide. To me seems loose as in I can lift it to a point and it doesn't spring back. Is it suppose to stay tight to the top of the slide it feels like it doesn't any force down till about 3/4 throttle when I hold it up with my finger also when I lean my bike over the idle picks up a lot
  4. ive got a 1997 yz250 and it needs replating or boring. idk about it because ive always been able to go to the local machine shop and they can do it. can i do that or do i have to send it in somewhere?
  5. i live near nc want to ride with some people gotta yz250
  6. 2001 yz250 I need some assistence, first time user. I am new to this, aquired 3 two stroke like new bikes. They really need jetting know how and jets size MAIN JET AND PILOT. AIR SCREW. I will apreciate any help. I am a serious enthisiast with smokers. 2 Tiempo. I want it to clean real nice but im also running wiseco piston and do 30:100 MOTUL 800. Dont know to run the castor mixes? //////// I also have HONDA CR250 2003 with the mikuni and it needs some tunning!!! HAVE NO IDEA
  7. Hey I was just wondering if anyone could help me with jetting specs and proper premix ratio. I have a 2004 yz250 2 stroke with v force reeds, and a pro circuit fatty pipe. Mostly trail ride and hill climb with some track activity. Was wondering if anyone e could shed some light because it seems like I'm running super rich. Any help is appreciated, thanks!
  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. 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...
  10. 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.
  11. https://www.youtube.com/watch?v=pfIu-RXWiV0 Please tell me how you think this bike sounds? 96hours on it
  12. I got a 1994 yz 250 and the clutch is a pain to pull in. Is their any way to soften it up?
  13. 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?
  14. 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!!
  15. So I have been using Thumper Talk for a while to find answers, but never created an account. Anyways, I figured it was time to start contributing to the forum and it gives me a chance to show off my new ride. A couple weeks ago I picked up my first ever brand new dirt bike! This will be a documentation of what I do to it. First off, the bike felt a little cramped. I'm 6'1" and ride standing up a lot so risers were in order. I wanted risers that would also put the bars forward to keep my weight distribution where the bikes stock form intended it to be. Not many options out there but Rox Speed FX recently came out with a new product I like. They give the bars 1 1/4" of rise and move them 1" forward over stock. I really like the risers and my body position feels a lot better now. The stock cables work fine with this set up, but I had to take the clutch cable out of the guide to have enough length.
  16. Hi, I'm looking to buy either a yz125 or yz250 upgrading from a yz85. I'm 16 years old, i'm 6'2" and weigh about 145lbs. I'm upgrading from the yz85 because the frame is too small and I've outgrown it, plus its a little weak. I would like to get a yz250, but they are pretty pricey and my budget tops out about $1500. I found a good deal on a 2009 yz125 ($1300), but I'm wondering if there isn't enough power? I'm not really going to be racing, I might go to the local track for practice every once in a while, but nothing crazy. What do you guys think? yz125 enough power for a 145lbs teenager? Or is the yz250 the better option because of the 125's lack of bottom end power (i'm used to this with the 85)? Thanks!
  17. im thinking about having my 7 carb slide cut to a 8 is this mod worth it? I ride from 300ft sea level to 4000. thanks for the input.
  18. I have a YZ250 1987. I just got new pistons and stuff. If anyone know whats the torque specs are let me know.
  19. Hey sick kunts! I was wondering for any advice on what bike I should get, I'm going to get back into riding. I'm going to purchase a bike of Craigslist, one that is relativly decent. I'm 20 years old and I'm 6,2 190 I was wondering if I should go with a yz 125 or yz 250, I havnt rode since 9th grade when we had to sell my bike before moving to pa but the last bike I rode was a kx85. Thanks
  20. 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
  21. 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
  22. 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.
  23. 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!!!
  24. 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
  25. 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!
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