Big Bore Kit
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Tourer
Joined: Jul 2005
Posts: 449
Likes: 29
From: Scottsdale, AZ
Big Bore Kit
Looking to do a big bore kit for a 2015 Ultra Limited, 103". Want to go as big as possible, yet maintain reliability. Not set on a particular manufacturer, likely FM or one of the other sponsors. Money is not the driving factor, doing it right the first time is. Was thinking a 117 or 124, or would a 107 be the best choice? Thoughts?
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Joined: Jul 2007
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From: 48.067222,12.863611
Looking to do a big bore kit for a 2015 Ultra Limited, 103". Want to go as big as possible, yet maintain reliability. Not set on a particular manufacturer, likely FM or one of the other sponsors. Money is not the driving factor, doing it right the first time is. Was thinking a 117 or 124, or would a 107 be the best choice? Thoughts?
Thread Starter
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Tourer
Joined: Jul 2005
Posts: 449
Likes: 29
From: Scottsdale, AZ
Fair question, budget is no more than 5k and I already have a D&D Fatcat. For power, I would like to attain 125/125, as a minimum and keep the rideability and reliability.
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
You mention FM, who are an HDF sponsor, as also are Hillside Cycle and possibly others. Check out the Vendor Directory above and phone one or more of the tuning specialists, to talk through your options. That will help you answer the points made by rhuff above. Don't be surprised if you get enthusiastic over something more than you initially planned!
Elite HDF Member
Joined: Jul 2007
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From: 48.067222,12.863611
Talk to a forum sponsor or find a reputable local builder. Where you live?
Edit.... I see AZ.
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Tourer
Joined: Jul 2005
Posts: 449
Likes: 29
From: Scottsdale, AZ
Well, you have the exhaust at least. Your best bet for 125/125 within your budget is either a 110 with head work or a 107 with headwork. Personally, 125/125 from a 107 is easily do-able, but you're going to be running on the edge of reliability. Not that it's not "reliable" perse, but you're at 1.16 HP per CI with a 107.
Talk to a forum sponsor or find a reputable local builder. Where you live?
Edit.... I see AZ.
Talk to a forum sponsor or find a reputable local builder. Where you live?
Edit.... I see AZ.
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Road Master
Joined: Nov 2019
Posts: 966
Likes: 665
From: Rhode Island
You say that you have a D&D exhaust? The owner of D&D has developed a set of cams that will give you an unbelievable amount of torque that you won't need a bore kit. Try calling him
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Elite HDF Member
Joined: Jul 2007
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From: 48.067222,12.863611
For 110, the S&S kits have been very reliable from the reports. I'd piece-meal it though because you're going to need headwork to hit 125/125. You need to talk to a builder IMO. A 107/110 without headwork isn't going to happen.
Road Warrior
Joined: Aug 2007
Posts: 1,392
Likes: 43
From: South Australia
A lazy 124 cube would be the go, would need case boring of course.
how much of the disassembly/reassembly can you do yourself? If a shop has to do the lot things will add up quick.
And you always go over budget ha ha, your 5k will more than likely become 8k as it's not just about bigger slugs and jugs.... factor in cams, headwork, injectors, maybe new manifold, new lifters, clutch upgrade, tuning (preferably a reputable dyno tuner) the list goes on..
how much of the disassembly/reassembly can you do yourself? If a shop has to do the lot things will add up quick.
And you always go over budget ha ha, your 5k will more than likely become 8k as it's not just about bigger slugs and jugs.... factor in cams, headwork, injectors, maybe new manifold, new lifters, clutch upgrade, tuning (preferably a reputable dyno tuner) the list goes on..
Last edited by Tat2u; Nov 25, 2019 at 02:02 AM.