Who knows what won't fit a 99 WR400F Engine
Posted November 17, 2005 - 07:00 PM
The rod end bearing at the crank pin failed and I hear the 426 is the most reliable of the WR's.
My 400 is California plated so I really want to keep it but I don't want to rebuild it only to have it fail again...
Do you know if I can bolt the 426 motor into my 400 frame?
I don't know if the outside dimensions of the motors are the same or not, I heard that the 450 motor requires a few adaptations to make it work and maybe the electric start would make that worth my time and effort.
I would like to hear from those who know what will interchange with the 400 and what won't.
Posted November 17, 2005 - 07:19 PM
Posted November 18, 2005 - 07:59 AM
i think a 426 is a bolt in mod for the 400. but im not 100% sure...
I would think so by the look of the two but I am not sure if the 426 top end is longer or wider than the 400. If it is longer it might need a 426 motor mount...
Posted November 18, 2005 - 02:03 PM
Posted November 18, 2005 - 05:12 PM
im pretty sure that the outside measurements are all the exact same, its just internal parts that are different.
I just don't want to buy a 426 motor and find out I have to "rig" it to work.
Posted November 18, 2005 - 06:32 PM
Posted February 11, 2006 - 08:39 PM
Posted February 12, 2006 - 06:16 AM
I found out that the 426 motor will bolt into a 400 frame and you can also swap out the crank, piston and cylinder and have a 426 displacement
this is what I did..... I kept my 400 motor but replaced the crank, cylinder, piston from the 426. I also had to replace the head ...which I did ...with a 400 head.
Posted February 12, 2006 - 03:05 PM
here is a site you can compare part numbers to ensure that it's all the same
and here is a site where you can get genuine yamaha parts at around half the price your local yamaha thief, i mean dealer can supply them to you.
i'm in the process of doing the same so if you finish first let me know the hard bits.