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Found 31 results

  1. 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.
  2. 2009 YZF250 - Ex Dixon bike with the wet sump conversion. Stuck a bunch of quality hours on this thing the other weekend doing some enduro practice. Didn't skip a beat! Changed out the oil and filter, putoline - 850ml with filter change as recommended by someone off the dixon facebook page. Fresh airfilter. Didn't start it for a few days after the oil change as was late at night after service, warmed it up at trackside this weekend with no issues to get the oil flowing, checked pressure by removing the bolt, all fine... Killed it. Came back to the bike about 15 mins later started fine, rode literally about 100m (wasn't hanging around but not going mad) and she just died under load, instant death. I believe it locked up, hard to recall. Didn't feel right either-way, i've had bikes flame out on me (CRF450) and this was a bit different. Bike started OK afterwards, I sat there with it on idle for about 10 seconds, all good, gave it some throttle and it just came to an abrupt stop again, almost made a squeak when it stopped. Rolled back to pits, checked oil filter, was fully soaked, everything looked fine, rads weren't exactly hot but i'd only been riding for a short period, head was pretty hot to touch, crank didn't seem that hot - but then again i've never touched an engine after 4 minutes of running so I've no idea what sort of temp it should be haha. Bike started again fine after little inspection, idled OK. Sounded sweet, no rattles or bangs. Started to give it some throttle, rolling the revs and it just came to a screeching stop again. Kicked it in anger and it hasn't started again since. Gave it a little strip down last night, took valve cover off, all looks normal, valves are in spec still, took the carb off and had a look down the inlet, small little bits of something foreign in there and the tiniest of metal slivers sitting ontop of one of the valves. (By this point i'd already dropped oil and filter for inspection, nothing that looked out of place) Now the bike kicks over OK. Its never had the strongest of compression on kick, but its been a while since i've had a 250F. it does 'get hard' at certain points but its pretty easy to kick through these hard points normally just body weight will do it. Can any of you advise on moving forwards, i'm going to remove head and cylinder for inspection but i've never dug this deep into an engine before haha! Any thoughts or tips on things to look out for? Bike has a spark I should add, not that this really felt like a lack of ignition.
  3. How can i fix this? Why is this happening when everything else if fine? Took it to a machine shop guy said 100 in labor to do sleeve and he said he didnt know if they made sleeves but they do. Im considering on buying a brandnew cylinder but lots of money didnt know if cylinder could be fixed or this will happen again. Heres the piston, then top of jug has chips taken out 30-50 thousandths
  4. Hi everybody, anyone sells the Kawasaki kx fi calibration kit? software cd + connection harness. Thanks ✌️
  5. I have a 2015 yz250f and was wondering if a 2020 yz front fender and plate would fit right on
  6. I’m looking into flipping a 2001 yz250f (because it’s cheap.) and I wanted to make it look like a 2019 (or just newer). Is there anywhere that makes a restyle/update kit for something that old? There’s also a 2003 i’m looking at but it’s blown rather then just needs a valve adjustment. Would that be a better option?
  7. I have a Voss helmet and really like it I was wondering if anyone else has experience with their products and what they think.
  8. so this will be my 1st post on any kind of forum so apologies in advance for any mistakes. i bought a 2005 YZ250F November of 2019, a few days after bringing it home i fired it up ready to go out and noticed once it had warmed up that the weep hole in the coolant pump was dripping slightly. so fast forward a few weeks after replacing the water pump seal i finally get to take it out. on low to mid throttle there was a severe intermittent loss of power, its difficult for me to explain as im new to bikes and dont really know much about them. i was told by afew people it was bogging down and could be a carb issue, ive owned pit bikes in the past and experienced bogging on those but this felt completely different, so i pulled apart the carb and it was abit of a mess, the main needle with the clip on is all pitted and discolored and all the jets have some sort of corrosion on them, the bottom of the bowl was stained with old fuel aswell as the floats so i cleaned them as best i could and took note of the jet sizes and are as follows: Leak Jet 95 Starter Jet 72 Pilot Jet 42 Main Jet 185 There is one other that i dont know the name of and it sits on the intake boot side and that is 100 To me it does not feel like a carb issue but im new like i say so not 100% so the other option i guess is a misfire? it happens low to mid revs but once you wind the power on past halfway the problem seems to dissapear and it runs fine. i dont ride track i just use it to bimble around fields so low to mid revs is really where im using it the most. i had a guy take a look at it and he instantly pointed toward electrics, he changed the spark plug from an iridium that came with he bike to a "standard" plug whatever that means. the bike idles better now and the harshness of the power loss isnt as bad but its deffo still there and is extremely annoying. he wanted to send away the whole electrical system to be tested but after he charged me £60 to change the plug i just took the bike back from him so this is where im at. kind of stuck and out of ideas so if anyone can point me in the right direction id really appreciate it. here is a video of the bike running as its easier to hear it than for me to try to explain it... https://www.youtube.com/watch?v=kX3IMe02hPU&list=PLzb20LSJtfUspxohQBQ3dp-n6hW5P9ZSQ&index=3&t=20s
  9. Just replaced my entire suspension and the forks are very stiff even when loosened all the way. I was wondering if the forks just needed to be ridden on to break them in.
  10. I have a 2008 YZ450F with the stock Keihin FCR MX 39 carburator. The mods that I know the bike has are a new FMF PC4 pipe with no spark arrestor and a aftermarket header pipe that looks to be just an OE replacement. I have already done the O-ring mod the the carb and have thoroughly cleaned and replaced all the gaskets. I also just re-shimmed the bike and checked the timing and everything is in spec, she starts as easy as a 2 stroke now and runs VERY well in everywhere but from idle to the first 1/8th throttle any maybe just a bit beyond that. There is a lot of popping and it sounds like it is breathing decently hard. My jetting specs Main jet: 160 Pilot:50 (sounds rich I know) Needle: NFLR 4th position Leak jet:55 Starter:72 Fuel Screw:1.5 (when I adjust this it hardly changes anything) So for the jetting changes I make if I put everything close to stock it runs very lean! So the bike runs amazing everywhere but that first bit so I was thinking about changing the needle diameter but I have NO idea on how to decode the Keihin charts and would appreciate some help I want the same needle specs as my OE needle but with the diameter being just a tad more on the rich side. From what I have seen here https://www.jetsrus.com/a_jets_by_carburetor_type/needle_keihin_N427-OC_FCR_35-41mm.html Changing the diameter to more rich would help fix my issue. I may be too stupid to read that chart or something but help is appreciated, thank you!!
  11. Hi need help stiffening the rear shock I want to raise the bike as it sits too low for me, Im 85kg what setting should I do like how many clicks thanks
  12. So I got a new to me 2007 rm85. I took it to the shop to have the fork seals done and they tell me the forks are destroyed inside. So I had to order a new set on eBay. The set I got on eBay turn out to be for a kx85 and the bottom triple tree has a gap of about .25mm. So my question is, what should I do? Do I buy a kx triple tree? Do I buy ANOTHER set of rm85 forks off eBay? Or is there something I can do to jimmy rig it. i traded a perfectly good running dirt bike for this hunk of turd and now I’m already $500 deep in new spokes, truing the front wheel, wheel bearings, fork seals, forks and, labor. So a budget minded idea would be nice but anything is useful because I feel totally boned.
  13. I have an 2006 yz 125 that needs a rear shock and A guy has a 08 yz450f rear shock. does anyone know if it will bolt up to my yz 125 and be fine to ride?
  14. I picked this bike up barley running. It would only roll start and when with was running it was popping a lot and would hardly idle (had to blip the throttle to keep it alive). At this time it was missing the air boot clamp to the carb and the hot start contraption on the carb was broken off in the carb. since then: New Intake valves (I did not cut them in) shimmed with in spec new top end gaskets carb rebuild kit (main jet: 160 pilot jet 45 currenty. also tried a series of combinations with 160, 165, and 42,45, 48) adjusted float level (with out weight of float on spring) and put a clamp on the air intake boot. now when I start it (mj:160 and pj:45) runs okay on choke dies when I take it off. When I had the mj165 and pj48 ran perfect on choke and idled fine with out choke but then died when giving it throttle. Process with fuel and air screw i used (the fuel screw i believe on the bottom of the carb bowl start woith 1.5 turns out and slowly work my way out to 2.5 turns out; while the screw on the side controlling the throttle i start with all the way in and work my way out) I am at 2100 feet above see level. Main problem still: will only run on choke with bigger jets and worse idling with smalller jets and more popping. If someone could point me in a direction I would greatly appreciate it! This bike is driving me insane
  15. Hi guys. I am looking at purchasing a new yzf. Im deciding between the 2018 and 2019. 2019 has loads of changes. Will they be very noticeable? should i just get a 18 now or wait for a 19. What do yous think.
  16. Check it out! Let me know your thoughts 🙂 2018 Shootout 450's BEHIND THE SCENES as a Test Rider
  17. So I went trail riding last week on my 450 and by the time I got home I'm ready to sell it. But maybe I can get some enlightenment here. The bike will not hold a line to save its life. I didn't know which way it was going to go at any given moment. It feels like the front tire isn't even touching the ground. I've got the new Dunlop on the front I think it's a 52? At times when I corner hard and at high speed it feels pretty good. But at slow speeds all it would do is cross rut and wouldn't stay put. I rode my brothers stock rmz and absolutely felt planted and confident about steering. Any help is appreciated. I bleed blue but this is game changer if I can't figure it out. Thanks for your time and input.
  18. Hi everyone, I was putting my 02 Yzf426 bottom end back together when I noticed this little washer type thing. I am wondering if it even goes to my bike or if it was just on my desk. If it is a piece of my bike, does anyone know where it goes? In addition I found these 2 black water pump seal looking things and I was wondering about those as well. Thanks everyone.
  19. Hey everyone just curious if I could fit Yamaha yz plastics/tank on a Yamaha yzf 250 2002 model frame? cheers
  20. I bought a YZ250F yesterday and the previous owner said apparently it runs but they weren’t strong enough to kick it. I couldn’t kick while there so I took their word for it and bought it. I’ve been trying to get it to fire all day today, there are 2 chokes and I’m unsure if the air mixture is correct, so would be nice to know what I should do, it’s hard to adjust the air screw when the bike won’t even run. I noticed the spark is kinda low, I don’t know if it’s normally supposed to be like that or not. I can see a blue spark but it is very small and crappy, I’ve had thumpstars that generated stronger spark, I changed the plug it’s still the same, so maybe could be an electrical problem, the only ground connection I could find was for the ignition lead which I filed down to bare metal so I’m pretty sure that connection is good. Anything else I’m missing? It’s very hard to kick and I can feel the compression out of the exhaust so I don’t think compression is the issue.Just wanna know what I should do, haven’t owned a yz before so I could be not using the choke right or something. Thanks
  21. Does anyone know if a 2010-2013 yzf 250 exhaust will fit my 2009 yzf 250?
  22. My rm125 leaks gas when sitting there on the stand with gas off. I've tried cleaning carb to make sure no dirt or anything! Please help! Also my kickstarter is tight when pulling out?
  23. Hi all, I was lucky enough to buy a grenade of a 2014 yz450f I’m having some trouble getting the cams to line up properly to the head, I have just rebuilt the top end after timing chain failure, all new valves new piston and rings cam chain and tensioner. The intake looks to be lined up but the exhaust is either partially hidden or slightly high of the head surface. the compression feels noticeably better with the exhaust mark slightly off the head easing be to think that it’s closer to right there... is there a pin count on the cam chain on these 2014 an up 450s? I saw a YamahaTechAcademy video on YouTube stating that there should be 27 pins between the dots on the cams but that leaves me where I am with the dot off the head??? any help would be appreciated I just wanna go ride!!! cheers luke
  24. Hello, I have a unresolved issue about my 2005 yz250f, I bought this bike as a basket case. I rebuilt the top end and put in a big bore kit, the bike does run but no matter what changes I make to jetting (leaner or richer) the bike still sputters and cuts out in the range mentioned. I do have a aftermarket exhaust that came with the bike, a white brothers exhaust. I have a new carb on the bike and I have tried from stock jetting to leaner and richer jetting. Much help would be appreciated Thankyou!
  25. 2005 KDX200, transmission oil looked milky so we rebuilt the whole water pump (mechanical seal, bearing, whatever other seals are in there. oil is still milky when I drain it. through the sight glass window it looks normal until after a ride in which it looks black but then it drains as milky white color. What could be the source of this? I figure coolant is mixing with it somewhere.
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