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Discussion Starter · #12 ·
Pix:
One of the hurdles I was gonna face was getting the right springs and retainers to fit my application on raising everything and come to find out Kibble White has already supplied it for the XX. These XX/XR650R replacement valvesprings are much shorter than the stockers(which I think are way too massive to say the least) and come with a spacer/spring seat to accomidate the shorter KW spring. Instead of using the spacers just weld up the boss and remachine it .200" higher and just reuse the stock spring seat.



Now that we can move the spring pocket up and out of harms way(which is the main hurdle to jump on raising the port). we can now build up the roof of the port with weld so we can have the material to open this intake port up some. Then the spring placement is were it needs to be to be able to raise the port once some material has been added to the roof of the port.


Lets add some material to the left side of the port wall as well. Theres plenty on the right side as you can see but none on the left.

 

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Discussion Starter · #13 ·
The possibility of even developing a 54mm inlet port is there. Just gotta have a junk head to cut in half to see if the waterjacket isnt in a key spot to take full advantage of this modification all the way to the seat. Only one way to tell.
Lets boldly go were no one has gone before.
 

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Discussion Starter · #14 · (Edited)

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Discussion Starter · #20 ·
43.5mm so its in need of some work. The outside OD of the clamping area of the port is 51.8mm so Im talkin about almost a total redo of the intake side of the cylinder head including the TB boot for an aftermarket TB on nonstock TB applications.
 
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