Zipper’s Updated Drop-On 107” Series Engine Kits For Harley Twin Cam® Engines.

107-1Zipper’s has new and updated drop on 107 Series engine kits for These kits are dyno-developed and road tested to deliver exceptional torque and horsepower while providing you with the durability that Zipper’s is famous for. These Muscle kits are engineered to start easily and run smoothly on premium pump gas while putting a wide smile on your face every time you twist the throttle. Everything you need is included!

Zipper’s Muscle 107″ Kit for 2007-Up Twin Cam® Engines. Zipper’s has carefully developed this package with optimized compression, porting, camshaft design and inlet flow, combined with their best-in-class finish work, extensive dyno and ride testing to deliver a very balanced engine kit that will not disappoint. The Muscle 107 delivers fantastic power curves with both torque and horsepower reaching north of 120. This power is very smooth and broad, with torque over 100 ft/lbs from below 3,000 RPM’s to above 6,000.

107-2Zipper’s Sport 107″ Kit for 2007-Up Big Twins. Zipper’s Sport 107 kit for 2007-Up Big Twin bikes is designed to provide maximum torque and horsepower in the range where most of us ride – between 2,000 and 5,000 RPM. If you’re the type of rider who rarely runs your engine to redline, this kit is for you. Stage II cylinder head design is matched with the Red Shift 575 camshafts for super strong low and mid-range acceleration. With just a twist of the wrist, you’ll have the power to pass without downshifting, even when your bike is loaded down for the long ride.

In compliance with ARB emissions laws, these products are not sold or shipped to California.

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8 Responses to “Zipper’s Updated Drop-On 107” Series Engine Kits For Harley Twin Cam® Engines.”


  1. 1 SIGFREED Mar 29th, 2016 at 4:51 pm

    How long will the std Harley tranny last with this fitted (not to mention the std final drive – albeit much less expensive to replace)?

  2. 2 Iron Horse Mar 29th, 2016 at 9:13 pm

    Had an early Zippers 107 in an ’02 Road Glide. Made 114hp and 120lb/ft of torque at the rear wheel. Problem was, you had to really twist the throttle to get it to respond. Anything under 3500rpm and a kid on a tricycle could out run you. Total pooch around town and in most real riding situations.

    I always suspected it was way over cammed and it looks like they have gone to a lot less radical cam profile with what they are offering in this kit.

    I rebuilt the engine into a 120 with a more mild set of Woods cams and the bike is night and day different. Absolutely a blast to ride now and pulls like a freight train right from the hit of the throttle.

  3. 3 Boomer Mar 30th, 2016 at 4:48 am

    But will the lower end handle this level of power without being reworked? They have been known to scissor or has that been worked out by the MoCo?

  4. 4 BobS Mar 30th, 2016 at 6:14 am

    Nice looking torque curve. Now that we have three brands making big American cruisers maybe one of them could make one with this kind (or better) of power output stock? Lmao, what was I thinking???

  5. 5 HD Rider Mar 30th, 2016 at 7:17 am

    After years of telling people that you had to bore the cases to get a 107 Zippers finally figured out you could safely bore the stock cylinders to get 107. I’ve been riding a 107 Road King and 107 Wide Glide for years without issue — both well over 110 hp. Also stock cranks in both — no issues at all (these are both 2010s).

  6. 6 Roadrash Mar 30th, 2016 at 8:51 pm

    Stock bottom end is fine and tranny has no problems. I am running the Fuel moto 107 kit and its the best thing i have ever done. Fuel moto is awesome

  7. 7 Blackmax Apr 2nd, 2016 at 6:16 am

    Zipper’s is a great company
    with great speed enhancing products
    Between S & S, JIMS & Zipper’s, I don;t know who I’d pick
    But if I had an H-D I would be running one of,
    or some kind of combination of all 3, in the bike

  8. 8 mike corbin Apr 4th, 2016 at 12:31 pm

    Nice complete set up!

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