2001? Yzf 426 stroked complete resto



63 replies to this topic
  • 03yzf450-kuke

Posted May 12, 2015 - 08:18 AM

#21

Drfinately chain looks too tight

  • grayracer513

Posted May 12, 2015 - 08:41 AM

#22

WAY too tight.  You are heading towards a failure such as this:

 

hubbreak.jpg

 

If you had a KTM 525, you could pull the output shaft out of the back of the trans that way.

 

Read: http://www.thumperta...-2#entry7755212



  • Nick H

Posted May 12, 2015 - 11:29 AM

#23

ImageUploadedByThumper Talk1431458968.992084.jpg
Fixed it,I had trimmed the new chain one link to short.

  • Baldwin

Posted May 12, 2015 - 01:51 PM

#24

Still looks a bit tight...did you check the free play? I cant remember exactly but I believe you want 40-50mm from the rear screw of the chain slider to the chain when it's pulled up as high as it will go. Double check the manual just in case.

  • grayracer513

Posted May 12, 2015 - 02:46 PM

#25

1.9 Inches with the bike lifted off the ground.



  • yzdaddy

Posted May 12, 2015 - 05:18 PM

#26

WAY too tight.  You are heading towards a failure such as this:

 

hubbreak.jpg

 

If you had a KTM 525, you could pull the output shaft out of the back of the trans that way.

 

Read: http://www.thumperta...-2#entry7755212

I have witnessed a come apart on a 525 there was alot of money spent before she was back on her feet.



  • Nick H

Posted May 13, 2015 - 05:28 PM

#27

I will measure the chain slack tomorrow at work. Seems the previous owner did not replace the clutch after the bottom end was shipped back from being rebuilt. Friction plates are below spec.Springs are bagged and the steel plates are warped.Clutch slips under load and when the bike is in first gear idling with the clutch in it wants to surge forward. Have ordered new springs, Friction plates and steel plates.They will be here Friday or Tuesday. Will post some pics when I install the new clutch.

  • Nick H

Posted May 19, 2015 - 08:51 AM

#28

Installed new clutch yesterday.Forgot to take pictures. Will post pics of old clutch today. Outer clutch basket fingers have deep grooves in them so that's on the buy it list now. With new clutch installed neutral is now easy to find with bike running. The bike no longer slips under load and the clutch no longer grabs when the lever is pulled in and the bike is running in gear. Clutch engagement is now much smoother but still a bit grabby.(I'm assuming from the clutch basket finger grooving.) Anyone know of any other wear parts to inspect once basket is removed? Will be a few weeks before I buy one due to $$ constraints.

  • grayracer513

Posted May 19, 2015 - 09:08 AM

#29

Does your clutch have the Bellville (cone) spring and seat washer in place at the bottom of the stack against the clutch boss?  That was the mod the factory did to take the grabbiness out of the clutch.  (#'s 13 & 14, along with th especial first plate, #12 in the picture here)

 

51634_clutch.gif



  • Nick H

Posted May 19, 2015 - 11:37 PM

#30

Grey racer the original clutch included these parts.However the new clutch did not. I am calling the dealer to see if they will order the special friction disk so I can reinstall the rest of the parts for the "mod". I also installed the new brake pedal that showed up today and took it for its first ride down a dirt road. About 5 km down the road the rear brakes seized. The pedal was under full pressure and was frozen so I'm thinking the problem is in the master cylinder. As well in the short ride the rear rim managed to kill a new set of wheel bearings due to the extreme bend on the rim. The front rim has a bit of a bend to it as well. If anyone has yzf rims that will fit my bike please let me know as it would seem I cannot ride the bike with the rims it has now. The costs are mounting but I am determined to see this through. Good news is that the motor sounds better the more I run it and seems to have plenty of power. I have not given it full throttle yet however as I am still breaking it in. Here's a quick pic of the brake pedal I keep forgetting to take one of the clutch parts.ImageUploadedByThumper Talk1432107454.714773.jpg

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted May 20, 2015 - 06:41 AM

#31

You probably have the connecting link from pedal to master cylinder too tight (too long), or something else may be causing the master cylinder piston to be advanced past the fill port.  Either that, or the cylinder is too full.  If the piston is pre-positioned too deep into the bore, the passage that leads from the cylinder to the reservoir gets closed off, and there is nowhere for the fluid to back up into as it expands with heat from the brake.  Same thing if you fill too full.  The fluid expansion then applies the brake for lack of any other path to take.



  • Nick H

Posted May 21, 2015 - 01:57 PM

#32

Shortened the connecting linkage as short as it would go and bled the brakes again.Brake reservoir is right between the add and full marked. Tried again. Same problem. Noticed rear rotor is warped as well. Thinking about removing the master cylinder and disassembling it.

  • Nick H

Posted May 22, 2015 - 04:06 PM

#33

Bought a complete parts bike out of Kitimat for 400$. The bike has a broken connecting rod and a hole in the bottom end. Rims are in excellent shape and the bike has tons of other good parts. Very happy about it. Bike is being shipped here as we speak should have it in a week or so.

  • Nick H

Posted May 23, 2015 - 01:08 PM

#34

Parts bike ImageUploadedByThumper Talk1432415245.839548.jpg ImageUploadedByThumper Talk1432415261.337943.jpg ImageUploadedByThumper Talk1432415271.538787.jpg ImageUploadedByThumper Talk1432415281.523869.jpg

  • Nick H

Posted June 01, 2015 - 09:09 AM

#35

I received the parts bike on Friday. I was very pleased with its overall condition. Over the weekend I put both rims, the front forks, various skidplates, the rear brake system,outer clutch covers,inner and outer clutch basket and various other parts on my bike.I also adjusted my chain slack as per grayracers reccomondation. I am very pleased with the end result. Have also built the parts bike back up into a rolling chassis so as to avoid losing parts. I also cleaned up and used the parts bikes header for the exhaust as it was unbent.And the project marches on! ImageUploadedByThumper Talk1433178468.531152.jpg ImageUploadedByThumper Talk1433178482.364436.jpg ImageUploadedByThumper Talk1433178494.981541.jpg ImageUploadedByThumper Talk1433178504.448503.jpg ImageUploadedByThumper Talk1433178513.666186.jpg ImageUploadedByThumper Talk1433178523.482030.jpg ImageUploadedByThumper Talk1433178546.200848.jpg

Edited by Nick H, June 01, 2015 - 04:37 PM.


  • Nick H

Posted June 02, 2015 - 09:47 PM

#36

Well it seems Lady Luck is against me. My motors top end has developed a horrible rattle with 2 hr on the engine. I will be tearing it down tomorrow and will post results.

  • grayracer513

Posted June 03, 2015 - 06:46 AM

#37

Before you rip the top off, be sure the rattle isn't coming from the right side end of the crank.  On the 2000 models (since you seem unclear as to the exact year model) had a habit of loosening the drive gear nut, which lets the balancer gear rattle around on the key that locates it.  Replace the key if it's beat up. 



  • Nick H

Posted June 03, 2015 - 07:05 AM

#38

Grayracer the bikes vin comes back as a 2002 but the swing arm and front master brake cylinder say it's a 2001.

  • Nick H

Posted June 03, 2015 - 06:09 PM

#39

Does this timing look correct?ImageUploadedByThumper Talk1433383795.286720.jpg

  • Nick H

Posted June 04, 2015 - 08:39 AM

#40

Okay so I did some searching of the forum and found grayracers excellent post on cam timing.My timing appears to be correct. However the valve buckets have discolourations on them.Stupid me I forgot to check valve clearance while I had the cams out.The bike is still stripped down however so I will check the valve lash today and post results.





Related Content

Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Forums
Photo

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride


Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.