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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #1  
Old 26th June 2021
xena's Avatar
xena xena is offline
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Sportster/Buell Model: XL883 w Hammer 1275
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Talking Hammerized 1275 and the bike rips hard!



Yeah baby! Break in complete, oil and filter changed. No leaks, no weird noise.., this thing is a stump puller for sure! Bike is running amazing…
I love it even more now than ever. Thanks so much Hammer 🔨
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(¸.•´ (¸.•´ (¸.•*´¯`*•--->Xena
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



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  #2  
Old 26th June 2021
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So very happy for you, let the bonding continue!
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  #3  
Old 27th June 2021
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Let er RIP!
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  #4  
Old 27th June 2021
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xena xena is offline
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Sportster/Buell Model: XL883 w Hammer 1275
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Definitely tomorrow. The low end power is unreal and the new lower pitch sound is a beautiful thing. She’s gonna be a whole lot more fun to ride.
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  #5  
Old 27th June 2021
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Sportster/Buell Model: XL883 w Hammer 1275
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Reputation: 1719203
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Daaaaaaaang. This new 1275 top end is freaking amazing! Prior to deciding on the 1275 kit I had been contemplating a new Low rider S as a birthday gift to me (turning 60 this august).
While I like the Low rider S I wasn’t crazy about another payment, higher insurance on a higher cc bike, and starting over making it comfortable for me. All things considered, putting some $ into my sporty just made more sense and to say I’m happy with the outcome is an understatement. I spent both days this weekend riding. Just me and the bike no friends no distractions. I had such a blast. Anyone who is thinking about these upgrades I say do it you will not be sorry but I also stress to read the entire Installation section on Hammers website in advance. They know their stuff and they’ve probably experienced every scenario that can occur during these installs. I loved my Sporty before this but now I love it ten times more. Thanks to all at Hammer �� Performance for all you do to help us with successful installs.

Last edited by xena; 28th June 2021 at 00:02..
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  #6  
Old 28th June 2021
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I also just finished up a 1275 on my 883. It was crazy torque with the factory D cams and low gearing. So I changed to some Reaper Cams and changed to gearing that is close to factory 1200 final drive ratios. It is incredibly quick. A MASSIVE change from the old 883. I understand your surprise and excitement.
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  #7  
Old 30th June 2021
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xena xena is offline
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Quote:
Originally Posted by Mr.Rowdy View Post
I also just finished up a 1275 on my 883. It was crazy torque with the factory D cams and low gearing. So I changed to some Reaper Cams and changed to gearing that is close to factory 1200 final drive ratios. It is incredibly quick. A MASSIVE change from the old 883. I understand your surprise and excitement.
Yeah baby, awesome ! Did you change the front sprocket and if yes how many teeth did you go?

Before this the bike had an NRHS 1212 kit topped with the original stock 883 heads and SE 497 cams I had installed ten years ago. Now have the 1275 with 07 1200 Impact serviced heads and it’s great. I have a 29T front sprocket I think I’ll install. The stock one on my bike is 27T and dang is it a stump puller. I’d love to recover a few rpm on the highway too so I think it will be best.
Congrats on your build too!

Last edited by xena; 30th June 2021 at 12:42..
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  #8  
Old 30th June 2021
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Quote:
Originally Posted by xena View Post
Yeah baby, awesome ! Did you change the front sprocket and if yes how many teeth did you go?

Before this the bike had an NRHS 1212 kit topped with the original stock 883 heads and SE 497 cams I had installed ten years ago. Now have the 1275 with 07 1200 Impact serviced heads and it’s great. I have a 29T front sprocket I think I’ll install. The stock one on my bike is 27T and dang is it a stump puller. I’d love to recover a few rpm on the highway too so I think it will be best.
Congrats on your build too!
I replaced the belt with a chain and went with a 23/48 final drive ratio. The stock 883 gearing was too low for all the extra power. I'm currently fighting a wimpy intake lifter so I have yet to fully experience the full potential of the bike but with this gearing, cam choice and extra displacement it's a pleasure to ride at all speeds.
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  #9  
Old 30th June 2021
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Quote:
Originally Posted by xena View Post
Yeah baby, awesome ! Did you change the front sprocket and if yes how many teeth did you go?

Before this the bike had an NRHS 1212 kit topped with the original stock 883 heads and SE 497 cams I had installed ten years ago. Now have the 1275 with 07 1200 Impact serviced heads and it’s great. I have a 29T front sprocket I think I’ll install. The stock one on my bike is 27T and dang is it a stump puller. I’d love to recover a few rpm on the highway too so I think it will be best.
Congrats on your build too!
You sure the stock pulley isn't a 28 ?
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Thy Sportster Come
It Shall Be Done
On Earth as it is on Salt
2006 Sportster XL1250C
Hammer Sledge Heads 1.98X1.61 Valves
Hammer 600 Cams
Big Ass CP/Hammer Pistons
Mikuni HSR 45 /Hammer Billet Manifold (Now HSR 48)
Jetted 27.5 slow,182.5 Main
97 Needle,Clip posistion 3
Hurricane Flow 3" offset AC,Rocketman Mod
Daytona Twin Tec TC88A,Rico Scarecrow Map
Sumax Thundervolt plug wires,NGK DCPR8EIX spark plugs. Gapped .040 and Indexed
Cycle Electric Stator and Regulator
Alto Carbonite Clutch (now with Barnett Pressure plate and 25% stiffer spring)
Royal Purple 20W50 MC Primary oil
Patriot Defender Pipe
Royal Purple 20W50 MC Engine Oil
Napa 7148 oil filter
Max Power, 111.47
Max Torque, 84.39
Best 1/4 Mile ET to date 11.85
Best 1/4 Speed to date 115.14
Build by Jester Motorwerkz West
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  #10  
Old 30th June 2021
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Highly-Dangerous Highly-Dangerous is offline
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Quote:
Originally Posted by xena View Post
Daaaaaaaang. This new 1275 top end is freaking amazing! Prior to deciding on the 1275 kit I had been contemplating a new Low rider S as a birthday gift to me (turning 60 this august).
While I like the Low rider S I wasn’t crazy about another payment, higher insurance on a higher cc bike, and starting over making it comfortable for me. All things considered, putting some $ into my sporty just made more sense and to say I’m happy with the outcome is an understatement. I spent both days this weekend riding. Just me and the bike no friends no distractions. I had such a blast. Anyone who is thinking about these upgrades I say do it you will not be sorry but I also stress to read the entire Installation section on Hammers website in advance. They know their stuff and they’ve probably experienced every scenario that can occur during these installs. I loved my Sporty before this but now I love it ten times more. Thanks to all at Hammer �� Performance for all you do to help us with successful installs.
Quote:
Originally Posted by Mr.Rowdy View Post
I also just finished up a 1275 on my 883. It was crazy torque with the factory D cams and low gearing. So I changed to some Reaper Cams and changed to gearing that is close to factory 1200 final drive ratios. It is incredibly quick. A MASSIVE change from the old 883. I understand your surprise and excitement.
Yeep!!!! welcome to the Club!!!

I changed the "D" for "W"s cams and left the original 883 gearing in mine.... she REALLY goes!!!

Happy Birthday Xena (in case I miss the day)... I am at your six... three years younger than you.

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