Jump to content

Search the Community

Showing results for tags '2stroke'.

More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


  • Dirt Bikes
    • General Dirt Bike Forums
    • Make / Model Specific
    • Dirt Bike Technical Forums
    • Special Interest Forums
    • Dirt Bike Regional Discussion
  • General
    • General Forums
    • General ATV/UTV Forums
    • Make/Model Specific
    • ATV/UTV Technical Forums
    • Special Interest Forums
    • ATV/UTV Regional Discussion
  • Inside TT
    • Inside TT Forums


  • Universal Parts & Accessories
  • Parts & Acc. - Japanese Bikes
    • Honda Parts & Accessories
    • Kawasaki Parts & Accessories
    • Suzuki Parts & Accessories
    • Yamaha Parts & Accessories
  • Parts & Acc. - Euro Bikes
    • Beta Parts & Accessories
    • Husqvarna Parts & Accessories
    • KTM Parts & Accessories
    • Other Euro Parts & Accessories
  • Motorcycles
    • Off-Road Motorcycles
    • Dual Sport Motorcycles
    • Street Motorcycles
  • Powersports Gear & Apparel
  • Trucks, Trailers & Toy Haulers

Products Categories

Vehicles Categories



  • Gary Semics Motocross Schools
  • Speed Through Fitness
  • Moto Mind
  • Test Blog
  • Trail Tales of Enduro in South America
  • The Rides and Writes of #141
  • Dual Sport Duo
  • Garrahan Off Road Training
  • Breaking Moto
  • Ontario Dirtbiking || CRF230F
  • Christopher sizemore
  • Rider305

Find results in...

Find results that contain...

Date Created

  • Start


Last Updated

  • Start


Filter by number of...


  • Start





Website URL






Found 343 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. Jesse T. Groth-kennard

    2stroke kx250 brakes

    so im rebuilding my bike again as you can see in the before and now pics, im a creature of habit and when i ride i mostly use the front brake because of years on a street bike, im thinking i want to tie the front and rear brake both to the front brake handle and still have the separate rear pedal just like on my 2014 artic cat 4x4 atv, and if it is possible to do by stacking the banjo fittings or would i need a brake bias to make it work rite, if so any ideas on this ridiculous idea?
  3. I recently bought a yz85 in great condition it just needed some carburetor work (the float needle did not seat properly). Now that that's fixed, I have a question. The bike is an '06 and the owner said "yeah it's still on the stock piston probably only has about a hundred hours on it" I cringed when he said this. But, nevertheless, I took a test ride and decided to buy the bike. When I kick it over, the compression is average for an 85 and it starts 2nd or 3rd kick cold and first kick warm. When riding it, there are no strange noises and I can hear no piston slap or anything out of the ordinary (listen to it in this video: https://www.youtube.com/watch?v=nx0VislGsg4&t=4s). I know a top end rebuild is a must on these 2 strokes so how has this bike lasted 12 years and still sounds like it's new? It doesn't bog, the only thing I have noticed is that it will hesitate while taking off sometimes when it's hot. I know I'm going to get the average "PUT A NEW TOP END IN IT NOW" 2 stroke guru, but is it really necessary? I have not taken the cylinder off yet but I put my finger over the spark plug hole and kicked it over and it has enough pressure to lift my finger but it's also really oily in there (oil ring left on my finger). So, what do you guys think? Does she got a few more hours or does it need a new piston ASAP?
  4. Hey all, let me get right to the point, basically for the past couple years I've had this bike, it hasn't been running right. It tends to start well, and has a decent amount of power for a 200+ lb kid on it, but once I attempt to hit the top of the power band, it tends to cough and sputter like it's choking. When I recently checked to carb to jet it, I realized ALL but one of the Jets are missing. I've checked the reed valves, they seem to be in great shape... However, today (it is a warm day) it ran great for a while, after topping off the oil and running with the choke half on, this bike also leaks oil, but I'm almost convinced that this is a jetting issue (being that they're missing) at this point, but I've also never put a top end in this bike. Thanks for any help, I'd just like to get an opinion on what you guys think. I know I'm all over the place btw, sorry for that
  5. anthonyquags12

    Clutch problems

    Hey guys, jut did a bottom end on my 04 yz 250, and the clutch won't engage. What I mean by this is it will start in neutral, and once I drop it into first (with the ever pulled) it stalls out. When I depress my clutch lever the actuator is fully engaged, so I don't see that being the issue, I've read that sometimes after you take out or put in clutch plates they stick because oil hasn't flowed through the plates all the way yet. I'm at a loss, any help is appreciated! Thanks in advance
  6. Hi guys, i have recently just bought a 2004 yamaha yz125, it has an athena 144cc big bore kit. The bike runs great! It has a loud knocking sound coming from top end but vibrates the clutch plate too. It speeds up when revved but goes quieter, also the sound dampens when the clutch is pulled in. The sound wasn't there when i bought the bike, then the knocking came after the second time of taking the bike out just up a lane. I have taken it out once to a proper track with this knocking sound and no problems or changes occured. By reading up it could be piston slap, but also many other problems. I don't know how long for sure the kit has been on the bike but the fella who i bought it from said "i think a year", but don't know of any care to the bike within that year because he was selling it for a friend. If any of you could help that would be great! And do i need to be majorly worried about this? Thanks
  7. meter86

    Lack of Power

    Hey everyone, I am new to the world of 2 strokes and I am having an issue with a 1996 CR250r that I recently acquired. To begin with the bike will bog down when I first hit the throttle and will do so again if I let it sit for a bit. However the problem goes away if I am constantly on and off the throttle. The larger issue however is that the bike seems like it is hitting a rev limiter at 3/4 throttle and the power is lacking for a bike this size. Id appreciate any help in trying to figure this out.
  8. Noahmd_10

    weird studder

    I just bought a 2004 ktm 125sx and it is a very clean bike. I have ridden it only a few times and i noticed a weird studder or kind of bog when in mid to high rpms and the bike cuts out for a second and then cuts back in a split second. I cant figure out what it is doing this. I keep air filter clean, new spark plug, good gas. I use an NGK BR9es, the manual says to use NGk Br9evx. i have read it could be powervalve, jetting, maybe silencer packing, im not sure. please ask any questions, i really want to figure this out. thanks
  9. kclark22

    2003 cr125 powervalve issues

    I just bought a 2003 cr125 and when i rode it for the first time it wasnt running right at all. It wouldnt hit the powerband in first or 2nd gear at all. The rpms would come up and then it would just sputter and fall flat. It sounded terrible and i didnt have a clue what was wrong with it. I read a little about it and decided to take a look inside. I took the cover off the right side where the powervalve is and it seems as if the arm isnt even connected. Can somebody please help me get this issue fixed. I need step by step instructions on how to remove and fix the powervalve. Ive owned 2 strokes before but ive never rebuilt one. Ive always had my dad there to help me and now that ive grown up, im on my own. Any help would be appreciated. I can also post pics if anyone needs to see what im talking about. Someone Please help me
  10. idratherberiding

    2 Stroke Winter Jetting

    Just bought a 2007 YZ250, my first 2 stroke. Want to stud the tires and ride it through the winter. Elevation is about 300m above sea level. Temperature ranges 0 to -20 degrees Celcius. What should I jet it at for these temperatures? Do I change needle position also? Not sure what current jetting is, oil ratio is 32:1 and tons of spooge out the exhaust pipe. Thanks!
  11. QuinnEXC

    Running rich?

    Hello, I ride a 2002 ktm200exc and am having a couple of specific tuning problems. Before I get into that, I run 40:1 in the gas, my elevation is 5800', my main jet is a 170 and I believe my pilot is a 45. I'm running the blue needle from a JD Jetting kit, and I believe the clip is in the highest position but i'm not sure. My float is to spec. The first problem iv'e encountered is that the bike will not reach peak rpms until 4th gear. The second is that the spark plug is too dark and too much oil comes out of the exhaust. I'm not sure what to adjust since I already dropped the main from a 180 to a 170. Thanks, Quinn.
  12. Hello, Situation: A yz125 has fallen into my lap. I don't know anything about its history, and guess it to be 2000-2001ish. It has been sitting outside for a few years, and hasn't been ridden in at least that long. It looks to be in pretty rough shape (rust on the frame, missing a kickstarter, brakes appear disconnected, busted exhaust etc.). I grew up riding dirt bikes (4 strokes) but have limited mechanical background (no background with 2 strokes). I am considering attempting to restore this bike to rideable condition as a pet project. Questions: Am I in over my head? Is this an impossible task for someone who has never worked on a 2 stroke? Any suggestions/tips on where to start? Any guesstimates on total cost and/or hours required (I realize this question is impossible to accurately answer - just looking for a rough estimate)? Any input is greatly appreciated.
  13. kellyleake

    Yz Front sprocket removal help

    I can't seem to remove the front sprocket on my 2002 yz 250. I even checked the manual . What am I missing ? Thanks in Advance for helping a jackass
  14. XRFeller

    YAY more peewee Probs.

    Hello guys. I recently picked up a 2000 something PW80. I put on a new top end(jug,rings,piston,plug, etc.) and a new carb as the old one was thrashed and had stripped bolts galore. My problem is i get a gnarly bog at about half throttle in all gears except first (mostly because first winds out before i reach half throttle) and it smokes like a mother ***. Also lots of oil build up in exhaust, nearly dripping. a few things about the bike. holes in airbox, exhaust washer and silencer removed, new top end, carb, removed the autolube system. i have to admit the carb was 12$ haha but it was nearly an exact replica of the stock one as i could see from the pics. im guessing its running hella rich from the plugs and piston already having black build up. my friend has an 1985 pw 80 and i used his carb on mine and it did nearly perfect except for the top end bog a little so i knw its carb related but im not sure what steps i should take from here. Thanks in advance for taking the time folks.
  15. In advance of getting my first 2-stroke , a 2000 YZ125 off the bench I'm watching a lot of videos of two-strokes trying to get a sense of how they are ridden. One thing I've noticed is that riders blip the throttles is a way that seems to be unique to 2-strokes; they rotate the throttle then open their hands letting it snap back by itself. I've never seen this done on 4-strokes. Why is it done on 2-strokes?
  16. Okay i have a 1994 KTM 250 EXC my clutch works perfect when shifting but if the bike is stationary and off when I am in gear and pull the clutch the bike won't move it works fine when it is running but if I went to bump start it or even just push it around without having to be in nuteral it won't work any suggestions?
  17. brianreed62

    Looking to Advance

    Hello all, new to the forum here and I'm excited to get my first post up. I am currently faced with the issue of progressing as a rider. I am 5'9" 155lbs and have been riding for about 4 years now. I currently own a 08 Honda crf230l and would say that I do mainly trail riding and enduro. I do commute to work occasionally but I wouldn't say that I absolutely need the street legal half, although it is convenient at hell. However I am at the point where I feel that I would progress much more as a rider with a different bike, for I feel that what I have isn't quite geared towards what I am doing. The bike almost feels heavy a lot of the time when riding and pretty unstable, especially around bends and gnarly terrain. Hills are always a challenge but the bike can chug its way up. I wouldn't say I'm a super aggressive rider, I'd say moderately aggressive, but then again that may be because of what I'm riding. Maintenance is no issue, I've been around the block and have been able to manage anything the Honda threw at me so I'm not really worried about that. My price range is anything under $3000 I was initially thinking about getting a trials bike to hone my skills in but now I'm thinking that I may just want to save my money and move toward a 2 stroke enduro bike, maybe something along the lines of 200 exc . I just don't want to have too much power and be out of control on the tight trails. I would consider a 4 stroke but from the research I've done, a 2 stroke with a heavier flywheel weight set-up is the best route, but I've never ridden one and don't know a ton about 2 strokes. Any thoughts and input would be greatly appreciated.
  18. Just wanted to share a video I saw recently of some guys riding their two strokes. Videos like this help me get through the winter haha!
  19. So the other day i bought a brand new 2017 ktm 250sx I took it for a ride on the mx track and it was great, heaps of power and good suspension. I took it home, cleaned it and did a little bit of maintenance. the next day I tried turning on the bike and it just didn't want to start. I thought it might of been a spark plug so I took it out and it was flooded with black stuff. It was a failed plug obviously. I did my research and it said if it's black, it's rich. so I changed the plug and it started right up with no problems. I checked the owners manual and it said main jet (440), idiling jet(42,5), needle(43-73), clip position(3), idle air screw(2 turns out) and my gas mixture is 50:1. it was all perfect for the temp and height I was riding at so i really dont know what's wrong. there is black oil coming from the exhaust aswell. Could anyone please help me and sort this out. cheers
  20. Well guys I messed up. When I first got the bike to rebuild I was told it was a 91yz250. Turns out it is actually a 89yz250 which I found out part way through my build. No biggie right? Well I forgot when I got my crank redone I used a 91 yz250 connecting rod.........These rods are 5mm shorter than the stock 89 yz250. So now my engine is fully rebuilt with zero chance of ever running since the pistion falls a full 5mm short of the top of the cylinder at TDC. My questions is where do the 90-94 yz250s lose their 5mm to use this shorter rod? I know the piston doesn't make it up with a 5mm higher deck...I currently have wiseco on a wild search to find any and all pistons that could potentially work on my now half torn apart Frankenstein engine. Does the 90-94 make up for the shorter stroke in the cylinder or in the cases? I know the clutch cover changes to the two piece style in either 90-91 but was doubtful that would have anything to do with the shorter stroke. See the build progress below since it isn't all doom and gloom and has been a fun project.
  21. Hi people, I know very little on how to do what I want to do regards to putting together a 2nd hand ec 300 I'm making videos to entertain others and myself during the build Any help would be great in the weeks to come Here is the link to my 1st episode of the Gas Gas Ec 300 Build Series Enjoy https://youtu.be/aMTOXVhyikI
  22. watch a short video of a Full rebuild of a 2 stroke bottom and top front to back , repainted, polished and refinished and rebuilt CR125R, this is the first year of engine water cooling, single mono shock, hydro brakes and the last year of the Special edition Elsinore 125cc 2 stroke racing dirt bikes.
  23. Lovett

    Cr 125 Fouling plugs

    I recently rebuilt my 2000 cr 125. I put a piston kit, v force reeds and a fmf fatty with shorty. I also cleaned carb and it was spotless. After everything was said and done, I noticed it started fouling plugs pretty frequently. I have 1.8 hours on it currently and have gone through 2 br9eg's and 3 br8eg's. The most recent plug I fouled just going down the road about 30-40mph. Also before I rebuilt it, I noticed it was blowing oil out of the exhaust onto the swing arm and dripping down the silencer. I thought rebuilding it would fix that issue but it is still doing it. I'm clueless at this point any help would be much appreciated. This image is oil the oil that accumulated on the silencer and swing arm since I rebuilt it.
  24. My Old/New 2008 KTM XCW 250. I knew I wanted a KTM.Knew one day I would have one,just didnt know which one.So I decided to let fate decide.So I placed a KTM sticker on the window of my truck and just knew one day I would come across what I was suppose to have,no matter the condition.I have my own A.C. business, and had a call to a Memphis radio personalities home one day.She sees the KTM sticker,says hey,my brother rides that kind and is selling one,my spidey sense kicks in,I say oh yeah?She says yepp,Ill call him to see if he has it,I know its on craigslist.I went to craigslist and there she was,in all her beaten down glory,good god all mighty,she was whooped on.I get it for $1200,knowing the suspension is shot,the E start,will not start,but she fires every time from the hip.I knew nothing about these xcw bikes,so I took her on home. I rode it for a few hours to feel her character then knew exactly what I would do.See,she was down on power and didnt like to get up and go,me weighing 220 didnt help out im sure.I had a challenge ahead of me.Here is what I did......I took it down to a pile of nothing and restored it Powdered the frame PPG white,The swing arm black,sub frame black.All parts are new,Factory KTM bearing in all areas,KTM wire harness,Rekluse Z Start Pro,Wiseco billet clutch basket,Lectron HV Carb,S3 Slavens High Compression head,SX CDI box,2011 model Translucent tank,Plastics including new airbox and 2017 front fender and plate,Moto Seat,Front Suspension by Zip Ty Racing with Gold anodizing of forks by Ty,Rear Nitro bladder and builld by KTM world,Chain and sprockets,wheels and tires,tubes,rear tail light,FMF fatty,power core,VForce 4 reeds.Lithium 130cca battery,all new updated 2016 xcw E start components,7602 racing clutch cover,ims pegs.All gaskets by Cometic.New starter and kill switch,new speedo lens.All nits and bolts are new factory ktm,even engine mount bolts.I know im leaving something out....I rebuilt this bike to how I envisioned it to perform with all the components combined,working together to enhance one another and it does perform. You can see black and orange,the day I got it home.Then the new,white frame and black powdered coated swing arm and sub frame.Then various money shots,but not all of the parts to the go fast puzzle.Finally the finished product.The condition of the bike is,the only things not being brand new would be the triple clamps,bottom end,rotors and radiators.Everything else is new.KTM world rebuilt the entire engine 75 hours ago per the receipts I have,which total over 2K.The bike runs so perfectly,it is just what I had in mind. Thanks for looking! Nate Davis