xb9 to xb12 conversion kit

[gixxerjoe06]

well i found out that my rear cylinder has no compression what so ever and the cylinder walls are all scored up and ruined..now that has happened i want to do the 1200 kit(wanted to but now i have good reasoning!) i did a few searches for a piston ring and jug kit to do so but have not found a single kit. could you buell gooroo guys help me out?? thanks in advance!!

 

[wolfo68]

if you're going to do that you need to do the 1250 kit. The xb9 and xb12 use the same heads and jugs, so if you're trying to just swap jugs with a 12 you're wasting your effort.

However if you need a jug send me a pm, I have a set that are currently just nice to look at.


Revolution Performance 1250 kit
nhrs xb9 kits

 

[gixxerjoe06]

so they both use the same jugs? i thought the xb9 jugs didnt have enough meat to be bored to a 12? my understanding is that they both have the same stroke but the bores are larger? then how could a 9 use the same jugs as a 12 then? dont take my questions as sarcastic, they are honest questions. im new to buells so im learning.

 

[loose1]

Wolf is right. All the xb use the same top end, except pistons. The stroke is different. You can make a 1200 with a 9 crank but it's not a bolt on swap, lots of machine work. The xbrr was a short stroke big bore motor.
Matt

 

[gixxerjoe06]

okay, from what ive been told before....im lost now. so heads are the same, jugs are the same, bore size is the same, stroke is different, cranks are different. yes?

 

[loose1]

Yep, rotating ass. is different. crank, rods, pistons.

 

[wolfo68]

9 pistons are domed for more compression with the shorter stroke to get the 10:1
12 pistons are flat topped and have a longer stroke.
They are swappable, the headers also have a different diameter, and the throttle body inlet is smaller on the 9

 

[gixxerjoe06]

is it worth the money to do the 1050 kit? or are the gains not enough to justify the expense

 

[Draxsonimy]

That 88" kit looks tempting!

 

[Draxsonimy]

no one else want that 88"?