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Found 35 results

  1. put new piston, jug, crank, and bearings in 05 yfz 450, according to service manual. when i try to start it carb blows out, exhaust sucks in. could i have put somthing together wrong?
  2. Hey I own stock why Yfz 450 and I'm just looking to slap a turbocharger on it.. I was just wondering if they're pretty compatible with these machines it is the carburetored version Yfz 450. I have all the piping hook ups / kit that's threw HURON SPEED an i also have turbo lined up for it gt 12.. I was just wondering what else I need to make this work? I know i would need to up the Jets and stuff for starter but Is it just that simple or do I need blow off valves and like some time on regulator on it or so forth? Trying get ideal what i would need
  3. I am looking to get a new bike this spring. Its either going to be a yfz 450r or the raptor 700r.I can pick both bikes up for the same price.So i am asking for every ones thought on what they would pick. I mostly ride trails with family and friends. I have raced gncc but that was with my 250r(how i miss her but she was stolen guess someone needed her more than me) I have a family so i am not blowing down the trails.But when i am out with friends we do like to hill climb off cambers and ride faster. Whats everyones thoughts. Any input or info would be nice. Thanks for reading and helping.
  4. i just got a yfz 450 and it went though the compression test and it came back as 155 is that good or bad? how could i change it if its bad? or what should i do thank you:)
  5. Okay so I need a little help just picked up a brand new 2012 yfz450 carb model being that it was a left over I thought my cutting out issue was bad fuel but even after draining the tank and putting fresh gas in it after riding for about 20-30 min in the trails if I hit the throttle wide open it cuts out bad (doesn't die though) it won't even climb hills and the one time it was so bad my buddy beat me on a stock 300ex my yfz is completely stock no mods at all and I have tried taking it back to dealer but since it mainly is after some trail riding they can not replicate the problem someone plz help I've only been able to ride this for one tank of gas being its running like chit and have to turn home at big hills my buddys chit quads climb right up
  6. hey all, so i been running dirtcars for years now and im getting out of it so i decided ima get me a 4-wheeler to have some fun with. Im looking on some input on yall thoughts as to which quad to get, ive narrowed it down to either the yfz450 or a trx450.
  7. I bought an 07 yfz 450 Bill Balance edition last november. It runs great, and has some mods that i cant quite figure out. I am pretty sure it has a big bore kit and a stage two cam on it. The problem is that the coolant leaks out of a tube that comes from the bottom of the right side of the ?crank case? (motor). It wasnt bad at all when I got it, but now that I have ridden it more, it starts to leak immediately upon starting. Even when its cold, and will continue to leak bad enough to empty the reservior under the seat in a matter of minutes. Any help would be great!
  8. i have a 05 yfz with a brand new battery. There is an issue with it not starting now. You can hear the cliking noise but no turn over.Battery is charged fully but no start.HELP!!!!!!!!!!! What is the problem or anyadvice to fix and not go broke in the process
  9. Spared no expense, Race Ready This a YFZ 450, This quad was built to run the pro am production class, however it was only built to be used as a backup. The bike has never been raced. I had the quad custom built by BBM company in Illinois. Its a stock frame with a full gusset kit and powder coated flat black. The front a-Arms are roll design with elka shocks with both rebound and compression adjust with high low. The rear has a roll design swing arm with elka too. RPM axle, Hardcore hubs on front. Full Bore yellow plastic. Has tag handle bars. Also has oversized radiator. all electronics have been removed and is kick-start. Comes with hiper wheels and Hoosier tires. The motor is a TC ported motor on carburetor and completely fresh with no hours at all on it. The bike has not been wrecked and frame is completely perfect condition. This is a fast quad and if you are looking for a sweet turn key MX quad with all the options this is it. This bike is ready to go to the MX track all you need to do is put numbers on. If you would like to see more pics just let me know. Asking $12,000 well over $16,000 invested and bike is basically brand new all around. call or text 217 474 3294
  10. Has anyone put a kickstart conversion on a yfz 450?
  11. Hey does anybody know anything bout proper size jetting for a 2008 Yamaha YFZ450? My lil cousin bought it 2 years ago and with the new purchase price has dumped a total of $16000 on this thing! He races it locally so had to remove a bunch of stuff to make it race ready! He didn't do anything to the internal motor to add power, just put on a velocity air filter with no lid on box, scary fast plate for stock carb, and full FMF pipe. All the money invested is in suspension, tires, carbon fiber rims, etc! Somebody messed with his carb and he can't figure it out to get it running again! Our elevation is 550ft up to 1500ft. What pilot jet, main jet, and needle position sounds good to run! Dynojet kit on hand! Thanks guys!
  12. got a 2007 yamaha yfz 450 that wont hold a idle runs awesome when on the gas but as soon as i let off it dies. mods i got done on it are full trinity racing pipe, dyna rev box, k&n air filter. running a 190 main jet rest of the carb is stock. set my idle screw all the way in and all the way out and everywhere inbetween and get the same result. was told there could be a vacume leak, anyone else run into a problem like this?? also has anyone herd of any EFI conversion kits available?
  13. I just bought this bike Monday off the showroom floor. It was a left over from last year. I only have 20 min of ride time on it. The bike shifts into first and through the higher gears w/out any trouble, but when I down shift the shifter will stay down.... It pops right back up if I tap the side of it with my boot. Does anyone know what's going on here? I was wondering if that oil seal that the shaft goes through may be binding it up, I wouldn't think that this brand new bike would have a bent shaft already. I called the dealership and thy said they couldn't get it in till mid august.
  14. I have recently rebuilt my yfz 450 as a lot of you know from my other posts. Well, they bike runs great. Very strong but i'm kinda wanting to sell it to build my 06 raptor 700r with 50th anniversary plastics. I've had a few potential buyers of the newly build 480 but all have turned out to be scams. I had an offer last night from a guy and after i covered all of my basis', he emails me this morning saying "well i did some research on the cylinder works cylinder you have on it and i found out that they tend to crack". Does anyone know if this is true? I've had no trouble with it. It has a 13:1 comp cp piston with a stock stroke 06 OEM crank and rod. The guy tried to get me to email the vin to him buy i refused and then told him if he was bringing a check, to make sure to cash it before he got here and the next email this morning was the about cylinder works cylinder having cracking issues. Thanks Chad
  15. just moved from sea level to about 4500 feet above see level. I already have a #170 jet in my carb...i finally got it to start after turning the fuel/air mixture screw a total of 5 1/2 turns out(it was running good at 2 turns out). gonna get a new jet and here's my question.....what size should i go up to? i'm trying to avoid buying a handful of different jets. and my next question is do you think i'll have to change my pilot?
  16. I just traded for this bike and do not know alot about it. It started fine when I look at althought it did seem to starter was having a little trouble turning the motor over. Now it just sounds like the starter is spining and it is not engaging. I took the cover off removed the starter torch limiter and the little gear behind it will spin very freely??? What does that mean? Battery is not the strongest in the world either. Anyone have any ideas? I down loaded a manual so I have some idea of how its put together. Thanks.
  17. Was wondering if the newer housings on the yfz where the radiator hose goes below the exhuast will fit on my 2004. Was wanting to get the hose away from the pipe. Thanks .
  18. Check out the latest dune video from the Spartan Racing Crew [ame=http://www.youtube.com/watch?v=Pu_uD5D_ZeA]YouTube - Oregon Dunes Apocalypse Two - Winchester Bay HD[/ame] Our you tube channel is spartanracing43 , please leave a comment we want to know what you think, good or bad let us know!!
  19. Hello, Can someone say what are the differencies between 350 raptop ( year 07 ) and YFZ 450 ( year 07 ) rear axles? I have new g-force adjustable rear axle and just thinking is it possible to install it to YFZ 450? Does that need some modifications or should it fit on it ??
  20. Which headlight bulbs are the brightest? I need some new ones, YFZ 450 stock bulbs are not bright enough 4 night riding. Thanks for help.
  21. Anyone have any good info on a good carb for a YFZ 523 Ice Cube. Was thinking about a 41mm. What to you all recommend.
  22. Bought a 2008 yfz 450 new 5 months ago and since oil change has been smoking blue smoke, oil. Smokes when revs up but not idling or riding rev up and smokes. Rings or valves?????
  23. i have a 2005 yfz 450. yosh exhuast, k and n filter, moose jet kit. what is the next thing i should do to get more power?
  24. My friend has lost her keys to her 2005 YFZ 450. What is the best way to get new ones? Locksmith, contact Yamaha, or buy a new ignition. I told her I would check on it for her. Thanks
  25. Hey guys, anyone remember me? *crickets*... anyways! along awhile i go i used to post and talk with you guys i was running a modded 400ex, 465 big bore, cams ect ect, I thought it was fast, lol... Traded it for a camaro to pursue drag racing, blah blah didnt have money nor time to put into the car, so TODAY i traded is for a GNCC race ready 04 yfz450, Cams, hiper wheels, Lone star axle, hole shots, list goes on and on, over 15k in this machine, runs pretty good, runs on 110 octane...theres so much to list on this its redonk. :disgusted: Expensive! Anyways, need to run all new fluids through it, But im back into the community and ready to ride it already! this thing is beyond fast. i thought my 400 was fast then got on this and first gear is just dissssgusttting. dont read the paragraph, to make a long story short, I miss this sport more than anything.. have a good one!

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