01 426 top end advice needed


1 reply to this topic
  • Digger01

Posted March 07, 2011 - 07:50 AM

#1

Hello everyone,

Thanks in advance to any advice because it is needed. Trying to save money so I opened up the beast due to blue smoke, 10 years of unknown maintenance and to hopefully install timing chain, piston and 450 cam. I am the second owner (4yrs) and it seems to be all OEM.
Before disassembly I checked my valve clearance;
Intakes were all 004” with shims of 2-180 and 1- 190 (most left).
Exhaust was .007” with 1 shim-180 and 1-unreadable.
Does my head need work?

The head looks good, seems like no damage in the cam caps or saddles, no sign of the valves hitting. I still need to perform valve fluid seal test. Should I just order valves and seals? Or Send to a shop for new valve seats/seals and valves?
Cylinder little scoured on exhaust side, after cleaning no visible scratches no scouring but I don’t have a bore measurer. Can I just hone this? Send to shop to measure?
The piston seems oem and doesn’t show any sign of hitting the valves. Can I just order new Piston kit (JE) with High compression?
Digger

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Digger01

Posted March 07, 2011 - 07:52 AM

#2

sorry for no photos but here is a link to photoshop

http://s1083.photobu...ums/Donlocke_5/





Related Content

Forums
Photo

BIGBORE FOR YZ450F 2006? by Taattie94


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 3 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017
Forums
Photo

Should I buy this bike? help....... by Numsa Hul


Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Forums
Photo

05 yz450f not fast enough by RedeyeYZ


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 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.