Big Bore Kit
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Grand HDF Member
Joined: Jan 2019
Posts: 3,588
Likes: 2,827
From: Mostly Florida, some Michigan
Big Bore Kit
Looking for input/ suggestions/ experience on a big bore kit. Bike is a 2008 Heritage, 96 cu in, Zippers cam, Thundermax tuner/ecm, new SE compensator, DK Custom ho-flo a/c, Cobra slip-ons and stock clutch.
103 vs 107?
S & S, Zippers, etc?
Compression ratio?
Oil cooler required?
Thanks in advance!
103 vs 107?
S & S, Zippers, etc?
Compression ratio?
Oil cooler required?
Thanks in advance!
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,077
Likes: 11,099
From: San Diego, CA
My suggestion would be to focus on what you want out of the mod, ie high rpm or low to midrange rpm performance. Then contact a shop (Zippers, Fuelmoto, etc) and let them suggest a selection of mods (or a kit) for your build.
This would be better than just randomly putting together several "brand name" components. Successful builds are based on component selections that compliment each other.
Most shops have experience with certain manufacturers and combinations, that are proven to get you to your goals. They build their reputations on the success of their recommendations.
Get a couple opinions, then make your parts selection based on the shop you pick's opinion.
Good luck with your build....
This would be better than just randomly putting together several "brand name" components. Successful builds are based on component selections that compliment each other.
Most shops have experience with certain manufacturers and combinations, that are proven to get you to your goals. They build their reputations on the success of their recommendations.
Get a couple opinions, then make your parts selection based on the shop you pick's opinion.
Good luck with your build....
Stellar HDF Member
Joined: Aug 2011
Posts: 2,738
Likes: 1,788
From: Newnan, GA
Looking for input/ suggestions/ experience on a big bore kit. Bike is a 2008 Heritage, 96 cu in, Zippers cam, Thundermax tuner/ecm, new SE compensator, DK Custom ho-flo a/c, Cobra slip-ons and stock clutch.
103 vs 107?
S & S, Zippers, etc?
Compression ratio?
Oil cooler required?
Thanks in advance!
103 vs 107?
S & S, Zippers, etc?
Compression ratio?
Oil cooler required?
Thanks in advance!
With the exception of the S&S flywheel, and SE chisel air intake, the rest of the engine is stock. My exhaust is a Bassani Road rage B4. It does not have crazy power but it is well tuned.
Last edited by Mongo1958; Aug 31, 2025 at 09:27 AM.
Hattitude gave solid practical advice. The only consideration I would add is choosing who will be performing the Dyno tune. I see you already have a Thundermax tuner.
Two general schools of thought around builds and tuning.
1. Use a tuner provided "base map" and use the tuner to "learn" the needs of the engine and adjust the map accordingly.
2. Use tuner provided "base map" and create a tune/map for your engine on a Dyno.
I'm in the option 2 camp.
A well proven Dyno tuner will be just as important as who puts the parts together.
Good luck with your build, A well built 106/107 twin cam is a ton of fun. I love mine.
Two general schools of thought around builds and tuning.
1. Use a tuner provided "base map" and use the tuner to "learn" the needs of the engine and adjust the map accordingly.
2. Use tuner provided "base map" and create a tune/map for your engine on a Dyno.
I'm in the option 2 camp.
A well proven Dyno tuner will be just as important as who puts the parts together.
Good luck with your build, A well built 106/107 twin cam is a ton of fun. I love mine.
Banned
Joined: May 2025
Posts: 148
Likes: 60
From: United States
Looking for input/ suggestions/ experience on a big bore kit. Bike is a 2008 Heritage, 96 cu in, Zippers cam, Thundermax tuner/ecm, new SE compensator, DK Custom ho-flo a/c, Cobra slip-ons and stock clutch.
103 vs 107?
S & S, Zippers, etc?
Compression ratio?
Oil cooler required?
Thanks in advance!
103 vs 107?
S & S, Zippers, etc?
Compression ratio?
Oil cooler required?
Thanks in advance!
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