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Old 27th August 2021
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xena xena is offline
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Default 1275 Dyno Chart Reference: All 883 -1275, all 1200 - 1275 conversions

For all 1275 dyno sheets. This is for dyno sheets only, no comments they will be deleted. Thanks
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Hammer Performance 1275 kit w flat tops, 2007 1200 heads with Hammer Impact Service, Hammer Performance custom billet intake manifold, Stock carb, N65C needle w 45/185 jets, K&N air cleaner, SE 497 Cams, Energy One clutch w 15% spring, Python 3 Slip ons, Dynatek DSPT-1 ignition on 28b




Last edited by xena; 28th August 2021 at 23:31..
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Old 28th August 2021
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I'll kick this off with a chart especially for you Michele



This is a chart a customer posted on FB a few days ago.
  • 2006 XL1200C
  • 1275 kit
  • IMPACT head porting
  • HP560 cams
  • TC88A ignition
  • HSR 42 carb on a ported stock manifold
  • V&H Side Shots, baffles cut in half
  • S&S air cleaner

Blue is before tuning, red is after.

I'm sure you see the resemblance to a certain "other" build ...
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Old 30th August 2021
yelladox yelladox is offline
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Sportster/Buell Model: xl1200ns
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Here is mine!

2018 Iron 1200 to 1275

Interestingly, although I have the 570 cam, my party only really starts at 4k RPM. I tell people I have a 90/90 setup.


  • Dynojet powervision
  • Bassani Road Rage 3
  • DK Custom HiFlow 606 Air Cleaner
  • Drag Specialties external breather
  • 1275 kit
  • Flat top pistons
  • Jackhammer 570 cams
(bronze oil gear, S&S precision lifters)
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