Zipper’s Big Bore 88″ Engine Kit For Harley Sportster XR 1200® Models

New from Zipper’s Performance Products, a proven Hammer 88 Kit available for owners of XR1200® model Sportsters®! This big bore stock stroke “square” engine kit develops an excellent balance of torque and horsepower that delivers lots of arm stretching fun (see Dynojet Graphs after the jump.) The kit is supplied with Zipper’s aluminum big bore cylinders with cast-in ductile iron liners, fitted with our special 3-13/16” bore forged pistons that eliminate the need to rebalance the crankshaft, Red Shift cams, Pro-Taper moly pushrods and telescoping pushrod covers, along with CNC-ported cylinder heads equipped with oversize valves. These heads feature fully CNC-machined combustion chambers that match the pistons perfectly.

Special hardware and a full gasket set are included. Rounding out this powerful package are high flow injectors and air filter element and a pre-mapped ThunderMax® EFI management module for simple plug-and-ride tuning! Zipper’s Performance Products offers two versions of this kit. One with emphasis on the lower and middle ranges of power (Big Torque) and one that shines on the upper end of the RPM scale (Big Horsepower). For More Information Contact Zipper’s Performance Products or Thunder-Max at Tel: 410.579.2828 or Fax: 410.579.2835.


15 Responses to “Zipper’s Big Bore 88″ Engine Kit For Harley Sportster XR 1200® Models”

  1. 1 BadMonkeyMW Dec 20th, 2011 at 11:00 am

    Those of some impressive numbers, what’s the msrp on that kit?

  2. 2 Jim C Dec 20th, 2011 at 11:12 am

    A Harley XL with more power than a Buell (at 2x the $$$$??) – finally

  3. 3 CafeSportyTC Dec 20th, 2011 at 11:45 am

    WOOO HOOO! now if i had the cash for both the XR, AND the Kit.

  4. 4 Boomer Dec 20th, 2011 at 12:05 pm

    My guess is they are $3,XXX.99 going by similar big bore kits they sell.

    The XR should already be a fun little ride. This would put in the Victory class as far as hp/tq goes. Would be fun to see how the compare. I think the XR would win against a Victory Hammer because of the 100+ lb difference between the two. Put some Lloydz cams in the Hammer and it wins.

    I’d love to put a Jims 124″ Muscle Engine kit ($6500) in a 07+ Dyna. Then put a 116″ kit w/cams ($2000) into a Hammer or standard Vegas and see how the two do. Not just on 1/4 mile but in the twisties too. We would be seeing some of the best America has to offer.

  5. 5 BadMonkeyMW Dec 20th, 2011 at 7:36 pm

    I don’t care how much power you can get out of that Victory, the XR will handle circles around that pig all day long. Power to weight ratio + suspension = Winning!

  6. 6 GeatJobJoe Dec 21st, 2011 at 7:14 am

    Would this particular kit be suitable for an XL-1200 “Low” 2006 carbourated?

  7. 7 Q-Ball Dec 21st, 2011 at 7:40 am

    Hope they did a better job boring those jugs than they did mine.

  8. 8 CafeSportyTC Dec 21st, 2011 at 9:57 am

    greatjobJoe, the cylinders and heads on a XR are completely different from a normal XL.. just FYI

  9. 9 Ron Paul Dec 21st, 2011 at 10:53 am

    You failed to state that this kit requires complete dis-assembly and case boring.

  10. 10 electroshiro Dec 21st, 2011 at 11:19 am

    The XR1200 uses the Buell version of the 1200 Sportster.

  11. 11 BadMonkeyMW Dec 21st, 2011 at 6:19 pm

    No it doesn’t. The XR is not the same motor as the Buell at all.

  12. 12 Ernie L Dec 21st, 2011 at 6:24 pm


    This kit is meant for an EFI XR…( EFI= Electronic fuel injected)
    Go to the zippers web site..they do have 88 kits for your application (carburator XL)

  13. 13 Boomer Dec 22nd, 2011 at 12:21 pm

    “BadMonkeyMW Dec 20th, 2011 at 7:36 pm

    I don’t care how much power you can get out of that Victory, the XR will handle circles around that pig all day long. Power to weight ratio + suspension = Winning!”

    You apparently know nothing of the Victory’s. I understand brand loyalty. I have a Harley and a Victory. Been riding HD’s for over 31 years. Trust me, when it comes to handling and balance, the Victory wins every time.

    The Sportster’s true claim to fame is on the mile round dirt track where they still use the 750cc version and are still doing very well. I’m a big fan of Sporty’s. I personally think they are the best air cooled V-Twin HD makes. May not be best for touring but for running around and basic dependability; It wins in the Harley line up.

  14. 14 ROCKSTAR Dec 22nd, 2011 at 1:31 pm



  15. 15 noel Jun 10th, 2012 at 12:03 pm

    i love my xr1200 it is the best bike ever even if i won the lottery i wouldnt replace it, when can we get some 4 valve heads already?

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