Street Bob beefed up engine?
Street Bob beefed up engine?
So I have been doing some homework into a FXDB big bore kit, like the S&S 106ci kit or a Kirby 107ci kit. Was just curious how many other bobbers out there have done this, or are curious about doing so, and if so, what kind of horse power/torque numbers were there and what was a relative estimate on cost. I am a big guy(280lbs+) and need to give my bike some more oomph if you know what I mean...
Outstanding HDF Member
Joined: Nov 2010
Posts: 2,250
Likes: 36
From: Montana
I haven't done this yet but I like the S&S 106 or Fuel Moto 107 kits best. Lots of guys have done this to there bikes here. Plenty of 103 upgrades as well. Look around here you should be able to find what you need.
Road Warrior
Joined: Aug 2009
Posts: 1,630
Likes: 17
From: Central FL
I don't think they are a bad idea but you will notice more gain from a cam with intake & exhaust than with the big bore. Not trying to turn you away from it but if you're on a budget it may help your choice.
I'll have to look into the cams and see what they can do, I am on a budget and am really looking for the info for a future project like after my warranty runs out. Most of these kits I have found as far as the threads are for older soft-tails or touring bikes. Dynas, as far as I can tell, are few and far between.
Outstanding HDF Member
Joined: Nov 2010
Posts: 2,250
Likes: 36
From: Montana
seems like at least 1/4 of the dynas on this forum have done a big bore kit as well as cams etc. Look around at some of the "best dyna" type threads you should find a ton of these bikes.
Cruiser
Joined: Apr 2011
Posts: 198
Likes: 0
From: Chicago
Check out Dragosbikeworks.com Talk to Frank he will give you all the info you need. You will have a lot better idea on what you want to do.
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Road Warrior
Joined: Mar 2010
Posts: 1,900
Likes: 12
No, placement like displacement. 
Two things that can be done to the 96" are cams, and a transmission pulley change to a 30 tooth pulley.
If'n I had the money. I'd go with a 106" or 107" and skip the 103" completely.
I lucked out and got a set of CVO 255 cams for next to nothing. They are right off a brand new CVO purchase with zero street miles. They are going in my 96" Street Bob.
Good luck. I figure you will be around 108-111HP/108-115TQ depending on the cam you use, tuner, and if you do head work and/or other factors.
Two things that can be done to the 96" are cams, and a transmission pulley change to a 30 tooth pulley.
If'n I had the money. I'd go with a 106" or 107" and skip the 103" completely.
I lucked out and got a set of CVO 255 cams for next to nothing. They are right off a brand new CVO purchase with zero street miles. They are going in my 96" Street Bob.
Good luck. I figure you will be around 108-111HP/108-115TQ depending on the cam you use, tuner, and if you do head work and/or other factors.
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Elite HDF Member
Joined: Apr 2007
Posts: 4,919
Likes: 23
From: Seattle, WA
Plenty of guys have done big bore, cams, heads, etc ... here's a link to a thread in the Dyna section for posting up dyno results and discussing the build ...
https://www.hdforums.com/forum/dyna-...e-tickets.html
... also, you might have a read of this link ... might help you sort out all of the info ...
http://www.harley-riders-guide.com/h...dson-cams.html
https://www.hdforums.com/forum/dyna-...e-tickets.html
... also, you might have a read of this link ... might help you sort out all of the info ...
http://www.harley-riders-guide.com/h...dson-cams.html
