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Discussion Starter #1
Would anybody happen to have the exact diameter of the triple tree steering head on our N4?

Doing some research regarding swaps from other bikes :)

Thanks!
 

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You can start with All Balls website:

https://www.allballsracing.com/22-1014.html

there's a list of the other bikes that share their steering head bearing kit with the 400, mostly Kawasakis, but also several years of KTM 390 Duke/RC.

They've got a feature for fork conversions that I hadn't seen before:

https://www.allballsracing.com/forkconversion/

That gives ID/OD/Width and their part number for the upper/lower bearing. The 400 shares with the 300 which shows (upper/lower bearing)

Kawasaki EX300 Ninja ABS 2013
30 48 12 99-3515-5 upper
30 52 16 99-3521-5 lower

then you get to look through the long chart to see what your donor bikes' stem sizes are and if there's a match with the Kawasaki bearing. Don't forget you'll need to check stem lengths too, and I have no knowledge of an easy resource for that data.

cheers,
Michael
 

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Discussion Starter #3
You can start with All Balls website:

https://www.allballsracing.com/22-1014.html

there's a list of the other bikes that share their steering head bearing kit with the 400, mostly Kawasakis, but also several years of KTM 390 Duke/RC.

They've got a feature for fork conversions that I hadn't seen before:

https://www.allballsracing.com/forkconversion/

That gives ID/OD/Width and their part number for the upper/lower bearing. The 400 shares with the 300 which shows (upper/lower bearing)

Kawasaki EX300 Ninja ABS 2013
30 48 12 99-3515-5 upper
30 52 16 99-3521-5 lower

then you get to look through the long chart to see what your donor bikes' stem sizes are and if there's a match with the Kawasaki bearing. Don't forget you'll need to check stem lengths too, and I have no knowledge of an easy resource for that data.

cheers,
Michael
Oh wow! This is amazing. Thank you very much for this!
 

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It is a lot easier to do that kind of search with the Internet at your fingers. In olden days, when all we had were steam-powered devices, you had to beg for copies of old catalogs from dealers, or go to a junk yard and find the bikes you needed to look at and get the measurements yourself.

You can often do a lot of good looking through online OEM parts fiche. Find the part number for your bike and plug that into the "where does this part fit?" search and see what other bikes use it. It is amazing how a part for a CBR600 becomes much less expensive on ebay when you find it listed as "part for Honda 50 stepthrough" even though it is the same part number.
 

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Discussion Starter #6
No luck yet.

Still new to this bike DIY thing and I have trouble grasping all the numbers :oops:
 

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No luck yet.

Still new to this bike DIY thing and I have trouble grasping all the numbers :oops:
Ok, I have the forks off the bike now (finally... that swing arm was a nightmare...). What do you need? If you get a picture of the diagram from the Kawasaki site and annotate it, I can get them for you.
 
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