KX450 intake valves on KFX450 - Kawasaki KFX450 Forum :: KFX450HQ.com
Engine/EFI/Drivetrain Discuss engine, fuel injection, air intake, and drivetrain modifications here.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 11-18-2017, 06:17 PM Thread Starter
Senior Member
 
Join Date: Jan 2016
Posts: 114
View Finadas's Photo Gallery(0)
KX450 intake valves on KFX450

Hey guys,

So I am trying to figure something out here, and any input would be greatly appreciated. So I am going to have my head ported and I am looking to change valves and any other, if any, worn out parts that. I don't know if the valves need to be changed but the bike is 5 years old and +/- 75 hours, how long to they last? Thinking of changing them just to be safe, but i don't know.

Now the first big question is: Looking at the valves diagrams for the 2 bikes, the only difference between them is the KFX450 has a SEAT-SPRING (16007A - 16007-0026) on both exhaust and intake sides, and the 08 KX450 doesn't. Is that seat-spring crucial? Because the exhaust valves diagram on both bikes are exactly the same (same parts numbers), except for this seat-spring which only the kfx450 has.

The second big questions and most important one: Looking at the intake valves diagram on both bikes, they are exactly the same (same part numbers), except for the seat-spring mentioned above which the kx450 doesn't have, and the intake valve which has a different part number (12004-0018 vs the kfx450: 12004-0026), despite the fact that they use the same springs, retainers, seals, etc.. Looking at this and since I am porting the head, can I change the intake valves for the 08 KX450 ones, so essentially having the same valve setup has the 08 KX450? If yes, would I include the seat-spring while assembling?

Please find attached a picture with the KFX450 exhaust valve diagram (left) and the 08 KX450 intake valve diagram (right), with the respective differences marked.

Thank you
Attached Thumbnails
Click image for larger version

Name:	KFX450 KX450 VALVES DIAGRAM.jpg
Views:	785
Size:	223.7 KB
ID:	21450  

- 2012 KFX 450R - OMX Graphics - Hot Cams Stage II - JE 12.8 Piston - Full Dasa Exhaust - Power Commander FC - Lone Star Sport A-Arms - RPM Dominator II Axle - Anodized Triple Fronts and Single Rear Shocks (JOGACA) - 15f/37r - Fuel Customs Intake - CV4 Radiator Hoses - Drenaline Bumper and Nerfs Bars - Reflex Brake Lever - One Industries Clutch Perch - Streamline Braided Brake Lines - GoldSpeed Beadlock Wheels - Alba Racing Grab Bar and Plate Blockoff - ODI Grips - Dyno Tuned

USA & Portugal

Last edited by Finadas; 11-19-2017 at 04:48 AM.
Finadas is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 11-20-2017, 06:44 PM
Senior Member
 
blue99stroker's Avatar
 
Join Date: Jan 2014
Location: Northern California
Posts: 1,926
View blue99stroker's Photo Gallery(0)
The stock titanium valves are very tough.
Check them when you have the work done

08 KFX450r- DASA, FCI, Stg 2 Hotcams, Wiseco FI, Dynatek Coil

Race Tech dual rate front springs, GT thunder XC Link and Race tech spring, LSR +2 Arms and LSR Axle

Poly Case Saver, Streamline Stabilizer, PRM Skidplates, Pro Armor Bumpers, Tusk Heel Guards, IMS 3.7 tank, 6K HID

Next up: Dasa Port Job, JE Pro 12 12.8 piston
blue99stroker is offline  
post #3 of 4 (permalink) Old 11-20-2017, 07:21 PM Thread Starter
Senior Member
 
Join Date: Jan 2016
Posts: 114
View Finadas's Photo Gallery(0)
Quote:
Originally Posted by blue99stroker View Post
The stock titanium valves are very tough.
Check them when you have the work done
Will do. Do you think the KX450 valves can be a replacement along with a valve job?

- 2012 KFX 450R - OMX Graphics - Hot Cams Stage II - JE 12.8 Piston - Full Dasa Exhaust - Power Commander FC - Lone Star Sport A-Arms - RPM Dominator II Axle - Anodized Triple Fronts and Single Rear Shocks (JOGACA) - 15f/37r - Fuel Customs Intake - CV4 Radiator Hoses - Drenaline Bumper and Nerfs Bars - Reflex Brake Lever - One Industries Clutch Perch - Streamline Braided Brake Lines - GoldSpeed Beadlock Wheels - Alba Racing Grab Bar and Plate Blockoff - ODI Grips - Dyno Tuned

USA & Portugal
Finadas is offline  
Sponsored Links
Advertisement
 
post #4 of 4 (permalink) Old 11-20-2017, 07:29 PM
Senior Member
 
blue99stroker's Avatar
 
Join Date: Jan 2014
Location: Northern California
Posts: 1,926
View blue99stroker's Photo Gallery(0)
I wouldn?t try.

Stick with oem or del West

08 KFX450r- DASA, FCI, Stg 2 Hotcams, Wiseco FI, Dynatek Coil

Race Tech dual rate front springs, GT thunder XC Link and Race tech spring, LSR +2 Arms and LSR Axle

Poly Case Saver, Streamline Stabilizer, PRM Skidplates, Pro Armor Bumpers, Tusk Heel Guards, IMS 3.7 tank, 6K HID

Next up: Dasa Port Job, JE Pro 12 12.8 piston
blue99stroker is offline  
Reply

  Lower Navigation
Go Back   Kawasaki KFX450 Forum :: KFX450HQ.com > KFX450 Performance > Engine/EFI/Drivetrain

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KFX450 Forum :: KFX450HQ.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
My first KFX450 Engine rebuild Ken500R Engine/EFI/Drivetrain 41 09-28-2017 01:14 AM
Velocity Intake Dundone For Sale / Wanted 3 01-24-2017 01:20 PM
Kfx450 won't stay running Baller508 General Discussion 6 11-19-2016 09:44 AM
FCI Intake WANTED Dunecrazy For Sale / Wanted 1 10-11-2016 02:59 PM
Kfx450 fci intake MattMoriarty For Sale / Wanted 2 08-22-2016 02:23 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome