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Found 501 results

  1. Okay so to start off i know for a fact that it is a carby issue. Basically i have a 1995 Kawasaki Kx100 2 stroke, and its never ever had a single issue for the time that i've owned it which is over a year. Recently with the weather becoming colder approaching winter in Australia, the bikes been really really un-happy. First i noticed that is wouldnt start like it used to so i was like no issues, probably just the colder weather, then while riding it i realized it would bog out at full throttle, like a blubwubwubwub kinda bog. After a bit of tinkering i cleaned out the carb and stuff and tried to tune it, i came accross a different issue, now basically when im riding and i get to like 4th gear, all the sudden the bike will rev out really high and ill loose all power. Then i upshift into 5th and it will be good for a second then rev out and i loose power again. Ive checked everywhere for air leaks and all that and i cant find any. is my air adjustment screw letting in too much air? and in the case of the bog at full throttle should i maybe go down a size on the main jet. Lastly theres another issue lol. when i start it it will idle for a second and then rev its guts out. Please help me, next step is to get a brand new carb i think.
  2. I bought this bike 8 months ago and it ran like a champ since I got it. The guy I bought it off of had the bottom end completely rebuild right before I bought it off of him, he had receipts showing the bottom end was only done 2 weeks before I bought the bike. Well I went out riding yesterday and in the middle of hitting a hillclimb it locked up and shut off on me. I was reading that wiseco makes garbage crankshafts but I wasn't sure if it was just because it was a wiseco crank is why it failed or if I was doing something wrong. The synthetic looking stuff they put on the crankshaft melted and seized my connecting rod. It's a 1999 KX250
  3. I just bought a 2003 kx250 a few weeks ago. The guy I bought it from said he dropped the bike on it's side, and after that, the front brakes would "act up," but after feeling them, I figured they would just need bled and would be fine. After getting the bike home, I bled the brakes and realized that they weren't just mushy, but they would only grab on for a second before losing pressure, even while holding the lever all the way down. Sometimes they grab a lot harder for a lot longer, but they mostly just squeeze for a quick second. Also, when attempting to bleed the brakes for the third time, I realized that every time I pulled the brake lever, bubbles would rise from the bottom of the reservoir, which I was thinking maybe meant the master cylinder was damaged causing it to pump air into the brake line, but I don't know. I don't really want to take my bike to a shop or to buy a whole new front brake setup, so any help or advice would be appreciated. Thanks! (Edit: I've never dealt with dirt bike brakes, so this is all new to me)
  4. 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
  5. I am looking at getting my first dirt bike, I have ridden quads and have always wanted to ride bikes. Before people start sharing there opinions about 2 stroke vs 4, this is what I'm looking to get out of the bike. Something that is fun and easy to learn on, Period. Don't worry about maintenance costs or the "thrill" of 2 strokes etc... I originally though 2 stroke but my buddy has a 2 stroke kx250 and i felt like i was out of control every time time i gave more then a touch of throttle. Is this because I'm new to riding dirt bikes or is this a 2 stroke thing. I want something that is easy to control and I like what people say about the smooth power bands on the 4 strokes. Cheers, Kyler
  6. 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!
  7. 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!
  8. I was looking to replace the old boyesen power reeds on my 01 cr250, so I ordered some boyesen pro reeds for it. But these ones have 3 holes in the lower petals where the cage has 2 larger holes. Is there any way to make these work or should I send them back? Can I modify the cage without &%$#@!ing it all up? Sent from my SM-G900F using ThumperTalk mobile app
  9. Looking for some help. I bought this bike blown up, rebuilt and bought new parts and put it all together but used the clutch that came with it. The bike runs really good. I went for the first ride and few days ago after some heat cycles and was just putting around my yard. When I first set off the clutch was working as it should, smooth feel at the lever, no lurching as I put it in gear or anything out of the ordinary. When I stopped and went to set off again tho, the bike tried to jump as I put it in gear and then the grab at the lever was gone. The clutch won't disengage. Has anyone else had a similar issue? I have been reading and many people said this was due to the plates sticking or grooves worn into the basket. When putting mine together I used a diagram and am quite sure it is together as it should be and the basket is not grooved. Could this be due to the oil? I was using 10w40 Castrol, should I try some atf type f? It's like there is suddenly more space between the pressure plate and the plates, I don't get it
  10. 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 !
  11. 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.
  12. Hello everyone! I'm looking to get into dirt bikes and need some advice. I have a little experience on bikes from 5-6 years ago going out riding track with a friend on his yz85. They always said I was, "naturally talented" and needed to slow me down, but again tiny bike. I have been practicing on his old XR100 and having no trouble. We will be doing mainly desert and trail riding. I'm looking mainly at 2Ts because of their low cost, low maintenance, and just seem more fun. Now, I have a budget of around 1200-1500$, and there are many 250 2Ts in great condition in my price range. There's a YZ250 that's been done over to be enduro and my dad really thinks I should get it. I honestly think I could possibly ride it, but I'm also cautious because I'm aware of the huge power it has. One friend says I couldn't, the other says I definitely could. I'm 5'10, 15 yo, 130lbs. Thank you so much for your help. Link to bike: https://losangeles.craigslist.org/sgv/mcy/6209138331.html
  13. Got my 88 Cr250 was idling odd so I cleaned the carb and tried adjusting the idle but can't get it perfect and now ithe will wind up like it's about to snap into powerband but it acts like it almost hits a rev limiter and gets some power but definitly does not sound right, any help much appreciated.
  14. KTM introduced its lastest EXC models at the iconic Erzberg in Austria. For more information visit http://www.ktm.com/enduro
  15. Hello all, I know this is a highly debated topic and one that has probably been discussed at great length. I apologize in advance for opening up this can of worms. Unfortunately, when I have done searches both on this forum and google, virtually all the threads I have read are old (2004-2010, maybe 1 thread from 2011'). I have not seen anything (2013-2017) regarding this topic. I think with progression of engineering that reliability on both 2 strokes and 4 strokes on 2014 + bikes is vastly superior of that of 2004-2010 bikes. (maybe I am wrong....) My background: I had a Yamaha RT 100 and TTR 125L back in the day (my only dirt experience). Then ended up with a GSXR 750 after college, then a KTM 690 SMC supermoto, CBR 600 track bike, and then a Husqvarna 701 Supermoto. So I am not new to motorcycles but my knowledge of dirtbikes and dirt riding is pretty limited. Obviously coming from a street bike the maintenance and service intervals are substantially different than a dirtbike. Hell, even my track bike does not require all that much maintenance and I ride the crap out of that (change oil every few track days). I want to get a dirtbike that I can go ride some trails (I will probably just putt around) and occasional try and ride a MX track (I imagine I would be very slow. I road a MX track back with my TTR 125L but that sucked because it had no suspension- amongst other things). So while I do not need race bike power, I would like suspension capable of hitting some MX jumps. Hence why I do not want a trail bike like a TTR 230 or CRF 230. I want something that would be able to actually take some jumps if I get to that point (I at least want to try and progress to that point). My question is: Would a 2 stroke (no older than 2007') be easier/cheaper to maintain than a modern day 4 stroke (2012' +). I have read 2 strokes need a top end rebuilt every 20 hours. Some say 30 hours, and I have heard people not racing run 2 strokes for 60-80 hours without a rebuild. Then they say 4 strokes are full engine rebuilds when they go (and the cost of the actual pistons and rods are significantly higher on the 4 strokes?) I will be riding not nearly as hard as many people on here would. I understand the powerband difference and all of that. I am more concerned with wrench time and cost to ride over anything. P.S. Holy crap, people have their bikes overpriced on craigslist. I am trying to pick up a small bike for my fiance and I am seeing like 2004-2007 TTR 125L's for like $2,000- $2,200..... a 10-13 year old small displacement trail bike???
  16. 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?
  17. Hi all, I'm looking at getting a bike that's good for greenlaning aswell as on the mx tracks. I want 2stroke and at the moment I'm looking at the KTM EXC 200. It needs to be road legal for the lanes but I want it light enough for the track. I'm not a super rider either hence not wanting a exc300 as probs to much power. I'm just curious as to what other bikes there are other than the exc? Price limit is £2,500. Cheers for any help you can provide!
  18. Hey guys. I am looking into getting a lectron carb.... just wondering if anyone here has ever bought a 38mm lectron and not liked it and took it off? if you took it off, and have it just sitting in the shop... what didnt you like about it? why arent you running it?
  19. Hi! I am wondering if a 2 stroke would suit my type of riding best. I do trail riding, but not stuff that's really intense. I am 5'5 or 5'6. I currently have a KLX125 and I like it, but need more power! I am thinking a KDX200 would be the perfect two stroke, if I were tall enough. Same goes with the XR250r. Any suggestions would be great!
  20. Having problems with Yamaha yz 125. Have an aftermarket keihin pj carb and bike cuts out and high rpms and fouls plugs easy. Replaced the main hex jet by a lot of sizes down and still does the same thing. Bike will start (not easy) and bog out and die after 5 mins of riding and won't start up unless you kick it over at least 30 times. Any idea what the problem could be? Thanks guys.
  21. So I have a 1998 Yamaha Yz80, and I need a new top end. I found a 2002-2017 Yz85 piston kit, for a very reasonable price, and I was wondering if it would be able to fit my 98 Yz80? Would the piston, wrist pin, bearings, rings, Etc be able to fit? And will it work?
  22. 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.
  23. Just rebuilt my top end, brand new vertex piston with rings. Measured to make sure every thing is in spec. Put everything back on the way it came off, torqued everything. And left the bike waiting to be started. The day finally came when I got a decent enough day to get on it and break it in. Started right up no problems. Let it warm up before I rode it. Rode it lightly at first, then started to get on the gas. Annnnnd there was no hit, I did do a jetting change for the colder weather, went up 1 size on the main. (162 to 165 Main). Changed the needle from a Necj to a Nedw. Both at 3rd pos. Had bottom end power, just no top end. When I put the cylinder on, I didn't make sure the little arm that controls the power valve was lined up with the sprocket thing. I did take the power valve assembly apart to clean it (it was clean for the most part, no carbon build up, just oily). Put back together just like the manual said to. I just don't think the jetting would have that much of an effect on the power. Before I rode it, I had my suspicions that I did not get it right because I didn't double/triple check when putting the cylinder on. I have a video that I took of the no hit segment. It sounded weird to me but wasn't sure because this was my first rebuild ever. ***I sound kinda weird in the video and excuse my cursing Lmao***
  24. Hello fellow riders! I have come to a point were I want a 2 stroke.... once again. Right now, I have a 2010 KTM SXF 250 that is a 10 out of 10 phenomenal bike. I'm looking for a bike that will be mainly trail ridden as the SXF is a full blown track bike. My budget being around $1600 i'm quite limited. From the research I have done, the YZ 250 has amazing bottom end power, and the CR 250 has a very mean top end with a wicked power band. If I had the money, no doubt I would buy the KTM 300exc. Here in Northern California, a 2000 YZ 250 is about $2,000-$2500, but a 125 is about $1600-$2000. I'm afraid that if i did get a 125 it would become very boring very quick. I'm 5"10 and about 135 pounds. Let me know what brand/ size bikes you guys recommend, any input helps! Thanks. Ben
  25. Hi there ! I'm currently looking for a used 125cc 2 strokes between 2000 and 2007. ME: I'm form Québec/Canada, I'm a 5.4 foot tall, i weight 130, i mostly ride trails(on dirt, sand, rocks) but i really like to jump, climb on some small rocks(a bit like trial) , and i do ride enduro style too. I CURRENTLY RIDE: an XR200a 1984 (with absorber) i really like that bike, it's undestructible and i can ride for ages with one tank. The downsides are the suspensions and the speed limit. I WANT: a light, 2stroke, 125cc, which i can use all around. I want to pay max 3000$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
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