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Discussion Starter #1
Can you bore a 103" to 107" or are you best to buy 107" cylinders? it seems to me there are a lot of venders selling 107" cylinders with piston kit. Is there any differences between the kits?
 

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Can you bore a 103" to 107" or are you best to buy 107" cylinders? it seems to me there are a lot of venders selling 107" cylinders with piston kit. Is there any differences between the kits?
Yes you can bore stock cylinders to 107". The advantage of a kit is shorter down time, but more money. I wouldn't spend the money to go from a 103 to a 107 unless it was a have to case, the bang for the buck will not be there.
 

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You can have your cylinders bored or you can get new cylinders its entirely up to you. It's less expensive to have yours bored
 

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4 cubic inches isn't really much of a big deal. With the proper cams, compression, heads, exhaust, and tuning, you'll see somewhere around 120/120 and you'll have several thousand dollars invested in your engine. You'll have a dyno sheet you can be proud of, and you'll have a Road Glide that's somewhat faster than stock Road Glides. But it's still a 900 pound bike with lousy aerodynamics, and it's still comparatively slow when comparing to other motorcycles.

You can do a good Stage 1 for about a grand; less if you troll the Classifieds. The performance increase from that to a built-out 107 will be noticeable, but just ain't worth it to me.
 

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Discussion Starter #5
Wow! take it easy! We don't need any sour apples,It's almost Xmass. (DOOF)Is that your Givin name? 120/120 sounds fun to me!
 

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We were on of the first shops in the country to start boring the OEM cylinder to the 3.937" bore size in 2006.
Our proprietary kits come with a complete Cometic gasket set, cylinders are bored/torque honed/plateau honed, ring end gaps are set, and installed on the pistons, in either flatop or 4cc domes.
Still only $600.00
We also have 107" combos with cams, w/o head work starting at $998.00.
BTW, ALL machine work stays in house, here. :)
Scott
 

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Run the 103 and save for a real build 117-124. Sure a 107 is short change but so is the return. when I blew my 103 in June I went with a S&S crate motor (124") a lot of coin but no regrets!!!
 

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Just stick with the 103 and install a good cam. The cam will wake up the bike and you can run it like that for a long time if you want. The 106 or 107 will be a good upgrade when you decide to freshen the engine but it's not worth doing it until that time comes.
 

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Discussion Starter #9 (Edited)
Ok! keep it at 103"do the heads (port polish and decked),cams,(tw-888 ?) Injectors, clutch spring,and a good tune. Am I missing any thing.(can I upgrade injectors?)
 

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Ok! keep it at 103"do the heads (port polish and decked),cams,(tw-888 ?) Injectors, clutch spring,and a good tune. Am I missing any thing.(can I upgrade injectors?)
No reason to change injectors, you won't be making that much power. Talk to your head porter about which cam to use and maybe shaving them to bump the ccompression up bit.
 

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Discussion Starter #13
Ya but it is 2700 10 hours to install then a tune or harley map. That alone puts it at 4300 at the local dealer pretty sure I can get a bit more For less?
 

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Wow! take it easy! We don't need any sour apples,It's almost Xmass. (DOOF)Is that your Givin name? 120/120 sounds fun to me!
No sour apples here, just a shot of reality. 120/120 from a 107 is going to mean that it's making more power to the right hand side of the graph, which means you're going to have to work it to see that. No big deal, but it's something to be aware of. And while it may be "fun-er", you need to decide if that little bit more fun is worth several thousand dollars. Especially knowing that even with that money spent, you're still going to be slower than most other non-Harley motorcycles.

I'm not saying this to be a downer. I've spent a fortune on motor work with one of the best engine builders in the country. My Night Train rips......For a 600 pound bike. And it gets embarrassed by any decent rider on a 600cc crotch rocket. I did the whole "compression and cam" thing on a CVO 110 (.30 Cometic and Andrews 57 with a big TB and a great tune). Yes, I could tell it wasn't stock anymore, and yes, I could see the benefit on the dyno sheet (and this wasn't a happy dyno like some others use), but it wasn't eye-opening by any stretch.

You want to have your Harley be more fun? Get a good Stage 1. Get yourself a pair of Ohlins shocks, throw a pair of Intiminators in the forks, and get some good EBC HH brake pads.
 

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Discussion Starter #16
Thanx doof 43 I might just have it ported and polish and cams and have Bean give it a real good tune. I already have a 2 into 1 Dragula II S&S air cleaner . Do you have any thoughts on a good cam?
 

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Have you guys not seen the hp/tq dyno graphs from fuel moto's 107 kit? They are impressive. My 103 with exhaust/breather/cams/fuel pump/dyno tune put down 84 hp 101 tq at 5k feet elevation. 107 kit is doing 115 hp 120 tq. That is pretty substantial for the 2k. Sure you can do stage 1 for 1k used but i wanted specific headers/mufflers/breather, my stage 2 was almost 3k. The 107 kit from fuel moto is nothing to sneeze at, it puts down more power than CVO 110 motors with cams. 117/120/124 motors can be built to be crazy high hp but they are substantially more money. 107 is good bang for buck.
 

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Black Hills Ken, in Rockaway, NJ, just finished a tune on a 107" we built for a client in Albertson, NY.
119 hp, 118 ft/lbs, sae, on a "honest", repeat "honest" dyno, with lower gearing, in not the best air quality.
That was with our Stage III Super-Tour Cylinder Heads.
Hits 100 ft/lbs at just about 2500 rpms, and finally "curls" at about 6300 rpms.
Mid 120's square with our Stage IV Heads with several different cams is not a problem.
Not a big hurdle tp establish this power here, as we've had 107" engines over 20 years ago, making those numbers.
All depends on what the client wants.
Scott
 

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Really the head work isn't going to produce much more torque and it would be a waste of good money. Head work will give you 3 to 5 ft lbs of torque and for the cost it isn't that much bang for the buck.
Just do a good cam which will get you around 110+ ft lbs of torque and pocket the rest of your money until you want to go with a 120 or 124 engine.
A 103 with 110+ ft lbs of torque is a good dependable touring bike and will give you miles of smiles.
 
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