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Found 550 results

  1. Which bike would you buy and why? KTM XCF 250 Yamaha YZ250fx thanks!
  2. Has anyone installed and used a Checkpoint impeller? I see dirt rider had an article about them and I've been curious about them. I've been having overheating problems recently and after spending well over $200 on brand new radiators I've discovered the radiators weren't the problem. So I bought new piston rings since they were out of spec (supposed to be like .15 and they were .5) and then thought about buying one of these aluminum impellers to help the problem instead of keeping the flimsy plastic one. I've read mixed reviews about them. Has anyone had any luck with them or is it basically just paying for the same overheating problems to happen?
  3. I got a new to me 2001 yz 250 which has a healthy motor and jetted properly for my elevation. The problem I'm having is when I'm in gear riding and push in the clutch the rpms don't drop to idle but if I give it gas it doesn't slip and revs freely. I can start the bike in gear fine and looked at my clutch already which has plenty of life left and my clutch basket is in good condition to. I adjusted my clutch freeplay which was already in spec. It has aftermarket clutch lever and I maxed it out as far as it can go outwards but the rpms still wont drop to idle when im trying to coast in gear. Another weird thing is if I'm stopped in gear with clutch pulled in it is at idle speed. Any suggestions is appreciated because I don't know what else to check.
  4. So I have a 2007 Yamaha YZ450f that I bought a few months ago. I took the bike out to desert for the first time, it was running PERFECT I was riding it for about 30 minutes and then all of a sudden it just started popping and was backfiring no matter what RPM I was at. I came to a stop and it just died, I started it up again, and I found the only way to keep it alive was by using the throttle. When I got home (sea level) I looked at the carb and noticed that the fuel screw fell out and was MISSING! I figured it must have fallen out while I was riding, So right away I bought a new Factory Effex fuel screw. When my new fuel screw arrived I installed it, and adjusted it 2 turns out. When I started the bike up with the new fuel screw, NOTHING CHANGED the motor wouldn't idle unless I had my hand on the throttle and was constantly backfiring on every RPM. So now I have the carburetor removed and taken apart, I could clearly see all the jets were clear. There is one thing that I noticed, a piece inside the carburetor was chipped off. When I took apart the carburetor the chip never fell out so I'm assuming whoever was working on the bike last must have dropped the carb and chipped it. After that I unscrewed the sparkplug, the sparkplug came out WET with fuel, figure this is due to such a rich mixture. I'm beginning to think that when the fuel screw fell out a piece of dust may have gone in it's hole and gotten into the circuit. Here's a picture of that chipped piece I was talking about. The fuel inlet needle looks good
  5. Ok so we have a thread in Northwest that is for helmet cam vids, well lots of mine are shot with my mobile, so sort of rules that out, also we have Short Attention Span Theatre, but those are 45 seconds max. Here in the Pics and Vid section there is a thread on Technical Trails, but the Secret Training Ground has lots of technical bits, these climbs are semi-technical. The more we ride them, the easier they get. There are also lots of short, technical spots generally steep with roots but those are all short sections. I will post up vids from the Secret Training Ground. If you have some Secret location vids, post em up, but it has to be a secret location. No telling where you're at. Backstory here... we keep making little climbs that are more difficult than the last one. First Hill, No Way, Rock Face, then OhEmEffGee, each time we're thinking man, not sure we'll get up it, then after wearing it down a bit we start to make it up on a regular basis. Cheers. Latest- hot off the press from the last 3-4 weeks. Rock Face Revisited bit is from last weekend. Super muddy slick (not as slick as wet clay though)... https://youtu.be/ZldYXmPAy9E
  6. Hey everyone! I went out to the desert last weekend and decided to record it. We rode mostly tight sand washes. Check it out! PS Turn up the resolution and the cameras were faced too far down but I tried to make it work
  7. 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
  8. I stripped the shift shaft on my 2001 yz125 2-stroke. I was wondering what parts I'd need to replace it, because when i look on rockymountain it showed the parts on everything that could be replaced. I was wondering if I could just buy the shift shaft assy, spacer, spring torsion, and oil seal. On the website that'd be 1,4,3,7. Here's where I'm seeing all this stuff https://www.rockymountainatvmc.com/oem-schematic/2. Thank you in advance for any replies.
  9. So I bought a WR400F cause Im a yamaha fanboy and I wanted something different from a DRZ like all my mates have. Everything seems fine except for the speedo not working (If anyone knows a digital one I can get please let me know), Until I accelerate...its only when I accelerate, its been getting worse I think. When ever I take it from half throttle or less to wide open (slow or fast) the bike almost stutters of coughs before finally getting the revs up then all of a sudden it's just peak power and goes like a lubed up rocket (Smooth). Even sometimes when Im dropping gears and I revmatch the bike will just cut out like its not getting enough air or not enough fuel? Happened a few times now, mainly when I blip the throttle quickly instead of a smooth flick. Anyone have answers on how to get that smooth action the entire way? oh and BTW (I know absolutely nothing about Bikes and carbys)
  10. Hello, I am looking for a used 125cc dirt bike. I am puzzeled because I do not know what I want, what would you guys recommend and why would you recommend it. Also where could I get performance mods, specifically suspension and which of the bikes have the most tuning capabilities. I've narrowed my choices down to Kawasaki kx,Honda cbr/xr, Yamaha yz, and Suzuki rm around the 2000-2005 range. I'd rather hear from people who owned one of the bikes but advice from any of the experts is welcome P.S I'm sorry for any mistakes like the wrong "sub forum" or grammar as I'm on mobile
  11. 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
  12. so i have a 1990 yz80 and it wont kick start when it is cold so i have to bump start it but when it is warm it kick starts first or second kick. It will bump start the first push but no kick starting. CAN YOU HELP ME!
  13. I went out riding for the day and on the way back home i fouled my plug so i walked it the rest of the way and i took a wire brush and cleaned my plug and it started first kick. I noticed it was a bit rich on the pilot so i adjusted the fuel/air screw and got it running really good but then i saw coolant steaming out of the radiator cap so i quickly turned it off and later in the week i diagnosed it as a blown head gasket so i ordered it and replaced it and didn't start but it backfires out the exhaust when i kick it. I even tried bump starting it towed behind a quad and still nothing but i heard it fire every so often but didn't start so then i started tearing the bike down cleaned the carb really good got all the jets, replaced the pilot air screw since it was missing parts, got a new spark plug cap since it was rusty inside and the plug was loose in there, took apart and cleaned the power valves, cleaned the spooge out of the expansion chamber and silencer but still wouldn't start so now i don't know what to do i think it might be a timing problem since its backfiring but i really need some more opinions before i start f-ing with it.
  14. I'm looking for and aftermarket clutch for my 2001 YZ250F that's I've done sone aftermarket work too . I'm looking for tips , tricks , and brand information ,preferences etc . .. basically any intel thanks helpful . Thanks a lot , also I wanted to see what was up with a good aftermarket shock to put in . If they even make one for itandbsome susp bison tips etc , thanks again guys !!!!
  15. Hey everyone, I just installed the GYTR FMF slip on exhaust today and got a few different problems. First thing I noticed was after turning the bike off, the exhaust started smoking out the back. Not a whole lot, but a noticeable amount of white smoke. When installing the exhaust I replaced the header gasket, and I also but Ultra Black Sealant on the slip on part of the exhaust. I'm assuming I used the wrong type of gasket sealant and that's what burning and creating smoke? It doesn't smell like burning oil or coolant, kinda smells like burning plastic if I had to describe it. Not very worried about this though, I guess i'll just let it all burn off or if it doesn't stop smoking, I will take it back off and try to clean it and use the right stuff. My big problem is the amount of backfiring; It only happens on deceleration. I did a quick check for exhaust leaks right after installing and didn't find any. I will do a more thorough check tomorrow. The exhaust that was on it before was a super heavy Lexx exhaust that was really quiet and probably very restrictive. Also the current map set is for super smooth and slow acceleration, all 0's and -'s (See picture below of the map). I'm assuming this smooth of a map is where my backfiring problem is? This is making me run lean correct? How safe is it to run the bike like this? Because I need to ride the bike tomorrow and my tuner won't come in until later in the week. Picture of my current map (middle one) & video of crazy backfiring:
  16. 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...
  17. https://www.youtube.com/watch?v=pfIu-RXWiV0 Please tell me how you think this bike sounds? 96hours on it
  18. Do an average rider feel any difference riding a 2014 vs 2015 !? is there any big plus buying 2015 or even 2016 model compare to 2014!? I had sold my 2011 yz450f , and tried couple of other manufacture bikes, but at the end i am getting back to YZ . now i need some advice from experts : i have 2 option : either buying a 2014 around 2900SEK(3600$) or a 2015 yz450f for 34000SEK(4200$) . should i go for 2015 or just save money by buying 2014 model !?
  19. Hey Guys, I just purchased a 2016 YZ250FX not too long ago, and before I bought it, I had no intentions on converting it into a dual-sport. Now, after riding alot of the trails behind my house, I'm finding myself pretty limited on trail exploration and wanting to drive on some pavement in order to find other cool stuff to go riding on.... I'm wondering whether selling my bike for a dual-sport such as the WR250F/WR450F or Converting my existing YZ250FX using a conversion kit and whatever else you need is the better idea? My area has some pretty rough terrain and some steep rocky hills that im going to need to throw at the bike. Any advice would be appreciated!
  20. Hey! My name is Kyler. So recently my bike overheated like 3 times, then finally one day it quit on me. After draining the oil, it turns out there's shredded metal everywhere. So I tore it all down. Now I'm not sure whats the problem. So far all that I found is the little rectangular reed valve was missing 1 out of 2 screws, and around that area down there is where I found the most of the shredded metal. also, I'm not sure if its a problem but the actual shaft on the crank has the slightest bit of play. Mainly I just don't know what to replace so please help! I don't want to put it all back together and not replace the main prob. Thanks in advance!
  21. Should I buy a 2002 YZ426f OR a 2009 CRF250R? The YZ has alot of extras and looks to be in pretty good shape, the owner used it alot, but took care of it. The CRF is in EXCELLENT condition and looks great Both bikes are for sale at about $1500, but i should be able to talk it down a bit I'm having a difficult time deciding between the two, I'd be sacrificing power for age and vice versa, idk any insight would be helpful. Thanks
  22. Hello I just recently bought my first dirt bike. It's a 1996 yz250 and I'm putting a 1998 yz250 top end on it. The power valve hit the piston and so I am haveing the top rebuilt. And I was wondering what I should grind off the valve? And also what are some other thing I should do to this bike. Thanks!
  23. Hi I have a 2016 Yamaha YZ 85 and it seems in lower gears if you give it some gas the throttle seems to stick. Like a cruise control on a car. But the throttle doesn't physically stick. Anyways does anyone know how I can fix this?
  24. Whats up everyone I'm pretty new to the forum so I'm not sure if I'm posting in the correct spot.Either way I need some help! what year kickstart levers will fit my 2007 yz450f. I got away with a Kim lever off a 525 exc but now I'm looking online and can't find much but one option for 130$ I'm seeing a lot of options for 2011 levers around 75$ and they look nicer with a blue instead of silver. Does anyone know what size the spline is? what other years I could possibly use? thanks in advance. On another note my oil filter housing bolt is stripped like most I see are dealing with. I have googled away and cannot seem to find where to order that bolt.
  25. 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?
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