103" to 107" - Road Glide Forums
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post #1 of 72 (permalink) Old 11-18-2015, 11:24 PM Thread Starter
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103" to 107"

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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post #2 of 72 (permalink) Old 11-19-2015, 05:41 AM
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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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post #3 of 72 (permalink) Old 11-19-2015, 05:45 AM
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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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post #4 of 72 (permalink) Old 11-19-2015, 05:57 AM
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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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post #5 of 72 (permalink) Old 11-19-2015, 06:25 AM Thread Starter
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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!
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post #6 of 72 (permalink) Old 11-19-2015, 07:11 AM
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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.
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post #7 of 72 (permalink) Old 11-19-2015, 12:23 PM
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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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post #8 of 72 (permalink) Old 11-19-2015, 01:42 PM
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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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post #9 of 72 (permalink) Old 11-19-2015, 02:30 PM Thread Starter
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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?)

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post #10 of 72 (permalink) Old 11-19-2015, 03:34 PM
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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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