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PostPosted: Fri Sep 13, 2019 1:37 am 
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Joined: Wed Apr 29, 2009 7:27 pm
Posts: 831
pash wrote:
03 wrote:
pash wrote:
Why not just buy standard pistons?

What a novel idea. Though he is going to need +0.010" oversize I should think if he's melted the piston skirt.

Good point and there’s are no oversize XB pistons IIRC. Which then comes back to the options:

Secondhand top end
Hurricane pistons plus rebore
Hammer pistons plus rebore
Wiseco pistons plus rebore
NRHS 1250 kit
Hammer 1250 kit

Yep. Multiple choices out there. And at least over the pond there's usually folks selling on pistons + cylinders they have taken off for a 1250/1275cc upgrade. The very last thing the OP needs to be worried about is how the pistons are actually made.

*** I don't think either Hammer or NRHS make oversize pistons actually. I do have a set of cylinders at home bored to +0.010" by Hammer (with Wiseco 10.5:1 forged pistons lOl ) but they are small fin cylinders not XB large fin cylinders.

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PostPosted: Sun Dec 22, 2019 9:46 pm 
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Joined: Wed May 06, 2009 5:28 pm
Posts: 7338
Current ride: Muffin 2001 X1
My thoughts are that they gave you a bad fuel map , Uly's aren't prone to melting standard pistons so if it was me I'd put standard pistons back in and make sure it has correct plugs and ignition timing and then bin that crap fuel map ;) there's only one guy that I trust with maps (and it isn't me ) :D

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2001 X1 2009 1125CR 2006 Uly X2 and a fully Maz'd S1


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