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Found 39 results

  1. frankllynn

    Yamaha YZ400F (1998)

    0 comments

    a
  2. Frans Sadie

    Yamaha YZ400F (1999)

    0 comments

    Rides like a BEATS starts like a donkey
  3. BeardedYama

    Yamaha YZ400F (1998)

    0 comments

    Been a pita first bike, I wish I would have just gotten something new
  4. coxic_357

    Yamaha YZ400F (1999)

    0 comments

    Solid and clean older bike.
  5. blu4hun

    Yamaha YZ400F (1999)

    0 comments

    Just finished! Now time to rippppp!
  6. deweym21

    Yamaha YZ400F (1999)

    0 comments

    I have been riding for quite some time and have not rode a dirt bike for some reason. Better late than never I guess. I love this thing
  7. The Dazzler

    Yamaha YZ400F (1998)

    0 comments

    Rides Well
  8. BigAssRat

    Yamaha YZ400F (1999)

    0 comments

    Still trying to figure out the 4-stroke riding style...but I like it so far.
  9. yz400fproject

    Carb conversion

    i have a 98 yz400f picked up for $500, want to do a carb conversion to a 2004 yz450 carb. i know the 2005-2009 are basically bolt on other then hot start and throttle cables but all I can find is a 2004 one, is it the same if I have hot start and throttle assembly?
  10. number0six

    99 YZ 400f backfiring!

    Hello long time reader… So just got a 99 YZ400f and as mentioned in the title it backfires fairy bad through the exhaust when backing off and the header gets super-hot I assume from the popping? Background- guy I got it from had it from new, he crashed messed himself up somewhat after about two years riding (he said no more than 100 rides) since then its sat in his shed. It starts no worries has a ton of compression and doesn’t seem to have any cracks in the header (all stock pipes). I have not checked the valves yet. Now I have read all the topics and know these are great for it and have pulled the carb apart and found that the jets have turned kind of green? What would cause this? Is it just from sitting around for the past 8 years? I’m planning on replacing all the jets and cleaning the carb completely but just thought I’d find out a few things first... How hard is it to do? I’ve never played with these bits before... I’m fairly mechanical minded but have a terrible history of starting a job while doing others and not finishing it straight away then forgetting what’s going on... I just finished a quad a few months ago and have a road bike on the go too (nearly there) but this is what I want to be on :-) All advice welcomed! Tar... Oh I am in Melbourne Australia and its hot hot summer here
  11. yz400fmaniac

    yz400f throttle bog

    there is a bog when i blip the throttle on my bike i know it has to do with the acc pump i watched a video on youtube on how to do the o ring mod but when i took the cover off my 98 yz400f carb has a different mechanism so i am stumped on how to get rid of the lag in the acc pump i will post a pic of what the mechanism looks like so maybe u could give me feedback on how to do a mod on it and if i even can. Also i had all new stock jets put in it and the whole acc pump was rebuilt. 2 rides ago
  12. This is a question that gets asked often but there's never really been a comprehensive reference for the info. The info here applies to hubs from any YZ model used in a YZ400/426/450. Thanks to Bob Russell at RTR Precision Wheel Lacing for helping collect this. Here's how it works out: Front Wheels: The front hub is the same from 1997 to 2001. Uses 20mm bearings. It can be identified by the four cast reinforcement ribs running across the hub. 2002 and up use the same hub. This hub also uses 20mm bearings. It is smooth across the center, with no ribs, and has a larger diameter at that point. Early Front hubs can be used on 2002 and up by using the 2001 spacers . 2002 hub can be used on earlier bikes by using 2002 and up spacers. This information applies to all YZ models from 125-450F. Rear Wheels: 1998 and earlier use the same rear hub, casting number 2VN00 on the hub. Uses 20mm bearings. These will not fit 1999 and later bikes because the axle is too small. 1999 and up use the same rear hub, casting number 5ET. Use 22mm bearings. Any of these can be used in any '99-'08 model by using the spacers from the year model bike the wheel will be used in. There are four different sets of these, each matching up with a change in the swing arm. You need two for each wheel. They're the same on both sides: 1999-2001 (5ET-25383-00-00) 2002 (5NY-25383-00-00) 2003-2005 (5UN-25383-00-00) 2006-2008 (5TJ-2530S-80-00) Rear wheels from 125's and 250F's have a 1.85" wide rim. All others have a 2.15" wide rims. Use the spacers that match the year of the bike the wheel will be fit to, and any '99 or later rear wheel will work on any '99 or later YZF. Some have asked about the fact that the drive side bearing and seal on the '06 up hubs are different than the brake side, or than the bearings on earlier hubs. The bearings are the same dimensions as the earlier hubs, however, and have no bearing (pun unintentional) on their interchangeability with other YZ rear wheels. Bearing info for '97-up front wheels, and '99-'08 rear wheels: Front - 6904-2RS - 20mm ID x 37mm OD x 9mm Right Rear - 60/22-2RS - 22mm ID x 44mm OD x 12mm Left Rear - 62/22-2RS - 22mm ID x 50mm OD x 14mm This information applies to rear wheels from YZ and WR models. YZ fronts will fit WR's, but will not drive the odometer, and YZ spacers must be used.
  13. yz400guy3

    Yamaha YZ400F (1998)

    0 comments

    i love this bike i got it about 2 monhs ago, my first bike bigger than a 250. its an amazing bike and it runs amazing!
  14. mxrider98

    Yamaha YZ400F (1998)

    0 comments

    I purchased this 400F really cheap and i am going to be restoring it. The motor has just had a top end which is big bored to 426cc. I am planning on stripping it down, cleaning, repainting and making it look mint. I will be making a thread of my restoration shortly, it will include my parts list, where i got them from and the cost. I aim to help as many people as possible and give you some good things to do and tips to help you restore your bike :)
  15. Frans Sadie

    Yamaha YZ400F (1999)

    0 comments

    Rides like a BEATS starts like a donkey
  16. MCahill

    Yamaha YZ400F (1998)

    1 comment

    Proud owner of the very first "big bore" motocross 4 stroke to be mass produced! Rebuilt her from the ground up and have invested positively WAY to much money into it over the years. She may be fat and and resemble a two wheeled tank, but she runs like a dream and has never let me down!
  17. Hey TT, quick question. My rear brake seemed loose so I took it apart and wanted to make sure I wasnt missing something. I noticed that the mounting bracket has a stud that inserts into the Caliper body and that is where the wiggle is coming from. I would assume some wiggle is ok but again it seems excessive. Question: In looking at the schematic and manual I only see what is called a "friction boot" but the pic is limited. Does the friction boot go into the hole in the caliper body to provide cushion or is it just the "o" ring type on the outside and the connection should be metal on metal - as shown in the pic below? Thanks!
  18. flymikemc

    Yamaha YZ400F (1998)

    0 comments

    Lots of power to carry my 6'5" 280lb frame
  19. I found a 1999 yz400f on Craigslist for 900$ it needs plastics and a new rear tire but the motor and frame look clean, is this a good deal?
  20. New to the site and I have picked up a 1998 yz400f for $400 from a buddy which I cannot seem to get to idle. (He couldn't get it to run right either which is how I picked it up so cheap) Have read up some on this issue but I have a few more things to take into account that may help yall to guide me in the right direction. Granted I am coming from 2 strokes and am fairly new to 4 strokes but have good mechanical knowledge. I have taken the Keihin flat cr carb off and completely cleaned it inside and out. All jets have been thoroughly cleaned to the point I could see very good light through them. Nothing was really dirty at all in the carb but cleaned it all anyway. Didn't lose any springs or o rings or the little washer from the idle/mixture screw on the bottom of the carb. I read that this screw should be 1.5 to 2 turns out and I set it at a tiny bit more that 1.5 turns out last night and put the carb back on and the bike fired right off second kick (even without the choke on) but it still will not idle. I have adjusted the black plastic idle screw on the side of the carb and it seems to have no effect whatsoever. Made sure that the tps sensor went back on the same angle it came off. The bike backfires bad on decel and shoots fireballs out the exhaust when it's dark out. Now the thing to take into account which may or may not help you lead me in the right direction with my bike is that ever since I bought this bike it has been missing the hot start button and hoses. All that is there is the hot start housing bolted to the frame. Any and all help will be greatly appreciated.
  21. Ajacklee4

    Yamaha YZ400F (1998)

    0 comments

    Great bike so far!
  22. Bigkuk

    Yamaha YZ400F (1999)

    0 comments

    I can't give an honest review yet I just bought it today.
  23. antanddionne

    Yamaha YZ400F (1999)

    0 comments

    Bike is in great shape just needs valves re shimming for it to run everythings there and is an absolute monster any questions just ask
  24. Gravesdigger

    Yamaha YZ400F (1999)

    0 comments

    First real MX bike, and for what I paid it slays most 450's.
  25. lightestYZF

    Yamaha YZ400F (1999)

    0 comments

    None
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