1999 YZ400f needs new engine want a yz450f motor


1 reply to this topic
  • K20-69-POS

Posted July 08, 2012 - 09:46 AM

#1

I have a friend with a "99 YZ400f, it needs a new bottom end. There was a '98 YZ400f that sold locally near me that had a newer 450 motor (can't remember if it was 03-05 or 06-09) swapped in. I was under the impression that this was not a bolt in swap? the swing arm on the later bikes is different? can I just get a swing arm from one of those bikes and put it on my friends 400f? basically what all is required to put a later 450f motor in a 400f bike?

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

Posted July 08, 2012 - 10:04 AM

#2

The '03-'05 motor will nearly bolt straight in, but you will need to address the swing arm pivot issue. The steel inserts at the rear hard point are removable, and they might interchange between the two engines. At worst, you can have a set made for you with the smaller bore size for the early pivot. Changing swing arms won't work because the holes in the frame won't match the newer one.

'06-'09 engines can be made to work, but they introduce carb clearance problems and take a bit more work to fit in. They also use a completely self contained oil system, so you would not use the tank in the frame.





Related Content

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
Forums
Photo

2016 YZ450 by CaptainKnobby


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

First Hare scramble tips by dhend8


Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 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.