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  1. Hi all, I have a 2004 kx 250 2 stroke and it wont start. it only backfires. I was out riding it one day and came up to a stop so the bike was just idling and it started to try and die so i revved it up a few times then let it die and now it wont start back up. It only pops or backfires when you kick it. Its getting good spark and i just put a brand new plug and coil in it. I took the reeds apart and they look like they're brand new. It was running great before so i dont know what happened. Im thinking it could be a fuel problem even tho the plug is a little wet if you take it out after a bunch of kicking. Any help would be greatly appreciated Thanks
  2. Okay guys, I have a 1997 kx250 frame and I wanna know(if even possible) if there are any 2 stroke engines besides the original that will Bolt onto the frame without any modifications.
  3. Lost my Kickstarter lever for my 1990 kx250. Trying to figure out what other Kickstarter would fit this bike if anyone has information on that it would save me tons of money and time to ride for this summer. thanks I’m advance. Really hoping to get this bike back in the trails.
  4. I am considering driving out to take a look at this bike. It's been for sale for awhile. I can't imagine that a handful of folks haven't looked at it....and passed. Before I go look at it, has anybody some wisdom to share? https://inlandempire.craigslist.org/mcy/d/kawasaki-kx-stroke/6174032017.html Thanks!
  5. Could someone tell me the dimensions of reed cage bolts for a 02 kx250? I can’t find any info online. Should I get fine or coarse thread?
  6. I bought a kx 250 a couple months back was told it was a 1997 i looked up the vin on the frame and it was a 1992. I didn't mind because regardless i had gotten 250 bucks off anyway. I rebuilt it and did the clutch but the gasket kit i bought for a 1992 kx 250 was not right at all so i bought a different one and that one wasnt right. Basically is there a way i can look up what year my engine is i tried typing in the engine vin and it didnt work. Thanks!
  7. will a clutch basket from a 98kx250 fit a 96kx250? How about the carb also?
  8. So i know my way around a crab pretty well and i'm very familiar with them i just can't seem to get the kawi dialed in it seems to have this unging/erratic rev thing going on when i pull in the clutch and i slow down so i'm looking for the correct carb adjustment for the bike it didn't seem to do it when it was warm out but now that it's in the 30's forties it's doing it my elevation here in upstate ny is 295' it's been around upper 30's lower 40's but i'd like to tune it so it's ready for summer because i don't ride it much in the cold so i'd like to tune it so it would be best in 70-90 degree weather since that's pretty common around here So could someone please help me out I need to know what the fuel to air mixture is needle position and proper jetting thank you
  9. 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)
  10. I'm looking for some aftermarket triple clamps for my 2004 KX250 and I can't seem to find any that will fit my bike. Ride Engineering, Pro Circuit, Tag, Universal, etc. Anyone know if the newer model 250F/450F triple clamps will fit my bike? Also, if I wanted to swap out the front forks all together for some new 450F forks, is that possible? What all would I have to replace? Any insight is appreciated. Thanks!
  11. So I recently picked up a 98 KX250 for a killer deal, The guy's wife just wanted it gone so I picked it up without to much discussion. He did tell me that last he remembered it ran rough and had some issues with the kick start. Cleaned the carbs (replaced jets), checked the cylinder, replaced cables, grips, chain, and a few other odds and ends. Got it to start up fairly easily just needed to find the sweet spot for the air and idle screws. I did notice the kick starter seemed to be slipping a bit, so I took off the right side engine cover and inspected it.. I found that the bracket that stops the ratchet was misaligned, and the post that it was suppose to fit over had sheared off, so it wasn't holding the ratchet correctly... at that time I just re adjusted the bracket to where it was suppose to be and tightened down the bolt... I thought I was good and took her out the track for the maiden voyage and on the 3rd kick the end of the kickstart shaft sheared off (I had noticed the end had already been 'twisted')... luckily I found a few people to help me push start her and was able to enjoy some time out on the track. When I removed the broken shaft I noted that the bracket had not moved, so either I installed it wrong or there is something else going on.. So I ordered a new kickstart shaft, and this time when installing I carefully drilled out the spot where the post was suppose to got and found an allen head bolt that fit snugly inside the bracket. This time I took careful steps to make sure I installed the kickstart shaft so the ratchet arm was resting in the bracket, then was able to get the spring in its keeper. So I though I was good. I went to start it and man as I remembered before the amount of force to kick it seems really high, more so that 450s I've had the opportunity to ride. It also would kickback if I didn't make it all the way through the stroke. I did eventually get it started and running decent. The next day I was about to get the carb further dialed in when I noticed that end of the new shaft I just installed was already starting to twist, so I decided not to kick on it anymore till I figured it out... This got me thinking, when I installed hotcams on my 250f I intially forgot to install the decompression attachment to the exhaust cam, and started considering it was timing related. I'm still new to strokes but it seems like the timing can really only be set at time of assembly? I know there is ability to retard or advance, which mine is set to the middle tick mark. So long story short what should a be looking at for a harder than normal kickstarts? Could the exhaust valves be opening and closing and the wrong interval? is there an easy way to check those without removing the motor?
  12. Hi guys, new to the forum! Making an account here however i've done some reading here before. I need some help with getting my dirtbike running. I am very frustrated with it as i haven't had the chance to even enjoy it since ive bought it. I've had maybe two good runs on it. Anyways here is the background: 2001 KX 250 2 stroke, Fully rebuilt top end and bottom end done by local garage. After the rebuild the bike was running pretty good. However I have had a issue with it losing spark. Took it for a good spin one day and the bike lost power suddenly and died. I started troubleshooting it, and found that it had no spark. So i went ahead and checked everything out and found out the new stator that the garage installed on it either developed a short or some type of issue. I checked it with my multimeter and proved that it indeed was faulty even though it looked new. So i threw the original stator that i had for the bike back in it and the bike had spark again. Yesterday, I filled it up with mixed fuel and had it running. Bike started fine and everything seemed good, however about 5 minutes after it warmed up it died. I checked the plug and it was full of fuel. So i was thinking it just flooded itself and no big deal. I then went and put a new spark plug in it ( tried an iridium plug as i read online that they are suppose to be better ) , bike started up fine and I was impressed with it, however after about 5 minutes of trying to warm her up the bike started to act boggy and i could feel the bike trying to die, shortly after it died. I kept kicking it over for a while and no go. So i then troubleshot it again today and now theres no spark again. I am very disappointed as the issue seems to be back to square one. Anyone have any input or advice, im at a lost cause with the bike. It's like when it warms up she gets boggy then doesn't want to start any more. Also i found it strange that the brand new stator became faulty or damaged and now with the old stator i am no longer getting spark. I had the motor fully rebuilt with wisco parts because i was hoping to take care of the bike, however i can't seem to drive it! Much thanks for any input.
  13. I have a 99 kx 250 that needs a cylinder. I need to know if a 94 kx 250 cylinder is compatible with the 99 model assuming I use the 94 power valves? the bidding ends in a few hours
  14. Hey everyone, So my buddy has a 2003 KX250 with a bent frame, and I have a perfect 02 rm250 roller. Anyone know how easy it would be to swap the kawi engine into the zuki frame? From what I've read it should be fairly easy, because the engine mounts are almost the same with the early 2000's... Any help would be greatly appreciated!
  15. Anyone who could help would be a great help and im in the missouri area interested would be great too
  16. Does anybody know if ya can still get new cylinders to suit a 93 kx 250 , Iv looked online just about everywhere by now , closest thing I could find was on ebay but to suit 2000 model , I have searched the forum but couldn't find the info needed , must be to suit 93 model!! ( need to get the old beast going again )
  17. First post. I hope someone finds this informative. I'm using this as a build journal to document my process and the mistakes I make along the way. 2007 KX250 12T front 51T rear sprockets I'm 5'4" about 140 pounds and not as in shape as I'd like to be. Bike cost me nothing. So I'm fine spending a bit. I cut the seat down, added a lowering link, redid the suspension so I can get one foot down. Easy pull inline clutch linkage did wonders for the left hand. 13oz flywheel weight did wonders for the rideability and made climbs a bit easier. Now I want more. I'm now in the process of taking apart the head and the bore to send to Eric Gorr to get a port job done and a decompression valve installed for easier starting. I also plan to get an FMF Gnarly pipe and Turbinecore2 spark arrestor silencer. The Boyesen Rad valve just came in the mail. Lastly, an 18" rear with some Ibex shoes. What do you people think?
  18. Alright so I bought a used 94 KX250 a while back and I finally got around to rebuilding the carb. But I broke something.. Trying to get it jetted right I broke what I believe to be the throttle connector AKA the piece that connects the throttle cable to the carb. After researching I've found that my throttle valve is NOTHING like a stock 94 kx250, also the piece doesn't thread into the throttle valve itself, It kinda clips in by turning. So now I'm stuck and can't find this piece. Anyone have any idea?.. The carb looks like this http://www.ebay.com/itm/Kawasaki-KX250-Carburetor-Carb-1991-1998-NEW-/122711084839 but its not the same as a service manual diagram.. Under are images of the piece I broke as well as the throttle valve.
  19. I am putting an 02 cylinder on a 99 kx 250 i bought. Ignition time for 99 is 11° BTDC @ 7000 rpm and timing for the 02 is 13° BTDC @ 7000 rpm. Is that a big enough difference where the stator should be adjusted or should it run fine?
  20. First off, I know that there are multiple posts on the cast/forged piston debate. I keep jumping between being firmly decided on one to the next. Here's my situation. This is the first bike I've ever owned (1999 KX250) and have ridden it for 2 seasons now. I use it for mostly trail riding with a few visits to the local track to display how much of a noob I really am. I noticed piston scoring through the exhaust port and not knowing the history of the bike I opened up my can of worms. I am at the point where my head was sent out and re-plated (due to small chips in the plating) and I found play in the crank bearing so the case is now split in half. I ordered the Hot Rods bottom end kit (CBK0055) and swapped out my input shaft and output shaft first gear with a '97 transmission as found in other threads here on TT. The crank was a wiseco, but rebuilding it was not an option anyways as some previous owner decied that the crankshaft threads on the stator side were too long and cut off all but a few threads 🤦. So now that leaves me with the decision: What piston to use? Wiseco? Vertex? Pro-X? OEM? I know that many people like the wiseco/forged pistons for longevity. People stated that the forged pistons didn't need as much clearance as in the past, etc but these posts were back from early 2010's. I am leaning towards Wiseco as I assume if anything forged has become even more versatile but my thoughts keep thinking "How likely is it to cold seize? Is it more likely to score my new cylinder than a cast?" and "If more clearance is needed for forged should I be running a cast in my recently plated (stock size) cylinder?" I just tend to over think things sometimes but the last question is the one that is bugging me. Thanks for any opinions/help. Also, is the case sealant just like a high quality silicone? I hear people mentioning HondaBond and YamaBond is good for this. Is this the same stuff you use on for grips?
  21. I have a new cylinder that i bought to rebuild my 1993 kawasaki kx250 with, because the old cylinder was destroyed. The guy said the cylinder is overbored a little but never gave us numbers. The new one i bought came with a piston thats been used and i would like to replace. I believe the piston that came with the cylinder is the correct size, but it very well could be off and i have no way of knowing. So how do i properly measure the cylinder bore, and how do i use this measurement to find what size piston I need to get? thanks, Kaelan
  22. Hi, i bought a 1994 kx250 that didn’t have a carb. I purchased a carb, new piston and rings and few other things. I cannot get the bike to start, it started for a second on me and that’s it. The spark plugs wet when i pull it out, it has spark. I noticed some jb weld on the intake boot though and i reused the gaskets. Any ideas?
  23. I am looking for a white rear fender for my 2003 KX250. So far I have only found 1 that is in Italy. It would take $90 including shipping to get it here. Does anyone know if the bolt pattern from my bike matches a 2006-09 KXF 250? I find them everywhere for the four stroke. Thanks for any help you can provide.
  24. Im looking at buying a kx250 because i want to go back to a 2 stroke after a while on the 4 strokes, but im not sure which year to buy, ive been looking at the 02 to 04 models the most but anything over the year 2000 pretty much
  25. After watching many videos that demonstrated how easy replacing crank seals are I went ahead and tackled it. Well after removing it looks like I'm probably pretty screwed but hoping to get some help here. As you can see in the attached photos there are three raised edges with a lip that looks like it was designed to hold the seal in place. Hoping someone has some ideas on how I can re-install the seal without splitting the cases.
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