Let's see your 400f's

119 replies to this topic
  • Kicker98

Posted June 19, 2013 - 06:32 AM


When I first got it a week ago.
Things I'm doing:
New tires front and back
New rear tube
Painted the exhaust to stop and prevent the rusting
Possibly changing the water pump system. I'll upload new pics when I'm done.

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  • fires

Posted September 21, 2013 - 08:23 PM


Here is my 98 YZ400F.


The guy before me didnt take care of it at all.


So I redid some things on it.


Wiseco Top End and Piston Kit 12.5:1

New gaskets

New seals all the way around

New sleeve for cylinder

New tires front and back

New shock oil/shock seals

New fuel lines


Doing vavle adjustment in the next couple weeks though


Next is

New plastics

New brake pads


But all in all great power. Will pick the front wheel of the ground easy.




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  • ThumprRider99

Posted September 21, 2013 - 10:02 PM


Here is mine all original 99 picked it up from a buddy at work, needs a carb cleaning.

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  • antanddionne

Posted September 29, 2013 - 12:34 PM


Bought mine as a none runner now just need someone to re shim it and it's good to gi

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  • boris the blade

Posted November 09, 2013 - 10:35 PM


here are some pictures of my old 99 wr400f with YZF tank & plastics



IMG_2714.JPG IMG_2835.JPG IMG_2836.JPG



  • UNDR_psi

Posted November 17, 2013 - 09:23 AM


just picked up a 98 YZ400F runs goods but needs a little TLC $700 off craigslist.yz5.jpg yz.jpg yz2.jpg yz3.jpg yz4.jpg

  • WrightStuff

Posted March 03, 2014 - 07:53 PM


Had this girl since July  of last year. Got for $600 on CL running rough. Needed valves shimmed and new timing chain. Also added a 2007 YZ450 carb. It came with the hot cam already installed. Had it on track, trails, desert, woods. Rocks em all. This bike is a classic - literally.  :thumbsup:



Edited by WrightStuff, March 04, 2014 - 10:47 AM.

  • grayracer513

Posted March 03, 2014 - 09:32 PM


You won't get many answers if you bury your tech questions in a picture thread, and your post is subject to editing for off-topic content.  Post your questions in a new thread and keep the picture threads on topic.

  • WrightStuff

Posted March 04, 2014 - 10:46 AM


Apologies Gray. Was trying to do too much with one post I suppose. Will get it fixed.

  • powerband BRAAAAAP

Posted March 04, 2014 - 12:55 PM


ImageUploadedByThumper Talk1393966489.287778.jpg

My new to me yzf400

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • frankllynn

Posted March 05, 2014 - 08:56 PM


1998 yz400f

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  • WrightStuff

Posted March 07, 2014 - 05:43 PM


Looks great Frakllynn. Do you know where you got those graphics? I can't find em anywhere.

  • mrz1000

Posted March 08, 2014 - 09:58 AM


Here's mine just got done the rebuild only had one problem the carb pisses fuel now...

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  • frankllynn

Posted March 09, 2014 - 08:23 PM


Looks great Frakllynn. Do you know where you got those graphics? I can't find em anywhere.

those was the factory effects graphics from a couple years back

  • 2strokekenny

Posted March 14, 2014 - 09:16 PM


ImageUploadedByThumper Talk1394860565.662897.jpg

  • rzr33

Posted March 21, 2014 - 07:03 PM


ImageUploadedByThumper Talk1395457424.067261.jpg

  • rzr33

Posted March 23, 2014 - 05:16 AM


ImageUploadedByThumper Talk1395580510.354899.jpg ImageUploadedByThumper Talk1395580527.969393.jpg ImageUploadedByThumper Talk1395580540.686718.jpg ImageUploadedByThumper Talk1395580560.171553.jpg

  • AFelix

Posted April 08, 2014 - 01:41 PM


photo 2.JPG

  • jakeh_16

Posted June 11, 2014 - 11:41 PM


mine was majorly neglected by previous owner.


so I rebuilt the entire bike.


now I own the BEST 1999 YZ400F on earth.

I am sure of this because no one else is silly enough to spend $6000+ on a 15 yr old bike


Excel A60 rims and spokes with Talon hubs front and rear

wave rotors, blue chain/sprocket

2008 YZ250 Shock, forks and triple clamps

2" handle bar raise mounts with pro taper contour RM mid bars 

ASV unbreakable levers blue

new radiators

2008 YZ450f Carb

Gripper seat cover

new plastics and graphics kit


it looks like something u'd see in the professional AMA


and now for the engine work


hotcams intake and exhaust

kibble white valves, seals and springs

polished ports and combustion chamber

wiseco cam chain

wiseco 13.5:1 hi-comp piston

hot rods connecting rod

crank rebuild

Hinson Slipper clutch

all bearings and gears/shift forks replaced

MSD programmable CDI

FMF PowerBomb header with PowerCore 4 silencer


deck and head machined giving a whopping ............wait for it...........14.7 : 1 compression ratio

runs on 115 octane E85 race fuel

dyno tuned carb and ignition timing making a huge 62hp


been running hard for 6 months now, I was sure it would explode under full throttle with the insane compression


will post pics of the bike tomorrow after I wash it

Edited by jakeh_16, June 11, 2014 - 11:43 PM.

  • kx4life13

Posted June 12, 2014 - 11:41 AM

Going to take my new baby on its second ride since I bought it! I got it last Thursday then took it out Saturday (i took it to knolls Utah. It worked great in sand!) and have been messing with all the tuning and jetting so it runs better In the Utah desert I think it should be running perfect for this weekend at yuba lake
ImageUploadedByThumper Talk1402602079.195591.jpg

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