103 vs 107?? why or why not??
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Cruiser
Joined: Dec 2011
Posts: 128
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From: liberty sc
103 vs 107?? why or why not??
im looking to do somw more winter mods... and now its motor time! looking at doing the 103 or 107 kit... what im wanting to know is it worth the extra money to do 107? and is there any reason why i shouldnt? just looking for some info from you guys thats know best.
Elite HDF Member
Joined: Jun 2008
Posts: 4,109
Likes: 9
From: Connecticut
It will cost the same no matter which you do. The numbers are about the same with the 107" just a stronger. but not by much. When it comes down to everyday riding they are both the same. Now if we rode dyno's then go with the 107" all the way. I'd go with whatever you can do at the best price. I did a 103 kit as I got a great deal on it. If you are boring your jugs then the price is the same
Stellar HDF Member
Joined: Feb 2010
Posts: 3,395
Likes: 266
From: Southern California
I went with a 103" build for several reasons; which may or may not apply to your situation:
First, I ride a lot. So making an error on the side of caution appeals to me. This is a personal matter, not really a technical issue.
Second, a 103" build leaves me a bit of room to freshen to motor later should I choose to do so,
Third, within the scheme of things, I don't see the 107" motor delivering that much more power than a 103" unless I do a good bit of work to the heads.
Fourth, between my choice of a 103" build and the camshafts I used I have managed to skate right on the edge of needing compression releases. Had I gone with a 107" build I would have needed to install compression releases because of the impact that the extra displacement would have had on the compression ratio of the engine (assuming that I didn't change to different cams).
First, I ride a lot. So making an error on the side of caution appeals to me. This is a personal matter, not really a technical issue.
Second, a 103" build leaves me a bit of room to freshen to motor later should I choose to do so,
Third, within the scheme of things, I don't see the 107" motor delivering that much more power than a 103" unless I do a good bit of work to the heads.
Fourth, between my choice of a 103" build and the camshafts I used I have managed to skate right on the edge of needing compression releases. Had I gone with a 107" build I would have needed to install compression releases because of the impact that the extra displacement would have had on the compression ratio of the engine (assuming that I didn't change to different cams).
Last edited by Bluehighways; Jan 15, 2012 at 08:37 PM.
Road Master
Joined: Feb 2010
Posts: 884
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From: n
I can't speak to the 107, but I am happy with my SE 103 stg 2 kit. All for pretty much the same reasons Bluehighways list. There are a lot of folks on this forum have pretty strong feelings against the MoCo set up, but I am quite happy with it. It works well for how I ride. It has been running fine for 2 years.
Tourer
Joined: May 2011
Posts: 324
Likes: 8
From: Florida
I've seen several 110" come into HD with carbon buildup. These guys are buying expensive 110" and riding them like a show bike. If you get a big motor, ride it like one and you won't have that build up. I'm fine with the 103". Get it up in the power band and runs out nice. I'd only go bigger if I had a reason to, not for bragging rights. That's not to say if I had a bigger one than a 103", I wouldn't enjoy it and run the hell out of it.
Tourer
Joined: Jun 2008
Posts: 283
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From: Delaware
Last time I checked carbon buildup has nothing to do with engine size. But what do I know. I am putting together my 107 right now so we will see how it works out.
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Cruiser
Joined: Dec 2011
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From: liberty sc
we like to hot dog our bikes a lot so i i didnt know if 103 or 107 was best.. OWOF i think i get what your saying bout carbon.. its like my landscaping equipment if you dont run it hard it get the same problem because it doesnt run hot enough to burn like it should
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Tourer
Joined: May 2011
Posts: 324
Likes: 8
From: Florida
Yep, mostly 110" going in with that problem. Loading up.