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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 8th December 2019
Bryan83taco Bryan83taco is offline
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Default Getting Hammered

After putting this off for a long time, I’m finally doing my 883 to 1275 conversion. I’ll be going with Hammer Performance and will hopefully get close to 90+ HP.

I got the Energy one clutch and spring plate done today. Tomorrow begins the engine tear down and packing the heads up to ship them to Hammer for some head work.



While the heads are away I’ll get the Impact 560 cams installed, chop the cam cover, and install A Lowbrow Customs belt to chain conversion w/1200 gearing.

I’ve already got a powervision tuner, and I’ll be upgrading to the bronze oil pump drive shaft while I’m in there doing the cams.

Any other suggestions from the experts?

Last edited by Bryan83taco; 8th December 2019 at 01:58.. Reason: Whoops
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  #2  
Old 8th December 2019
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seajay seajay is offline
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You have a service manual, right? Double check everything.
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  #3  
Old 8th December 2019
Bryan83taco Bryan83taco is offline
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Default

Quote:
Originally Posted by seajay View Post
You have a service manual, right? Double check everything.
I definitely have a service manual. I wouldn’t dare tackle this job without one! I think the manual was one of the first things I bought for my bike when I first bought it.
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  #4  
Old 8th December 2019
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Default

aren't the pulleys and belt the same between the 883 and 1200? I thought the gearing difference was the primary drive.

Andy
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  #5  
Old 9th December 2019
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Need to check years
28 tooth for 883 29 tooth for 1200
primary is different front pulley for 1200 @38 and 883 @34
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Old 9th December 2019
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Looks like 2010 is the last yr the 883 had the 28t sprocket.
Starting in 2011 both the 883 & 1200 get 29t.
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  #7  
Old 9th December 2019
Bryan83taco Bryan83taco is offline
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Default

I ordered this kit from LowBrow Customs

https://www.lowbrowcustoms.com/lowbr...t-2004-up.html

It’s for 2004+. The front sprocket and and rear pulley dictate gearing, 883 vs. 1200. Please correct me if I’m wrong.

Got the heads and jugs off today. I’ll get the heads shipped off to Hammer this week. Next weekend I plan on installing cams (Impact 560), the above belt to chain conversion kit, and preparing the cam cover for a chop.



Odd question but, what do you guys do with the 883 jugs and pistons? Trash?
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Old 9th December 2019
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Quote:
Originally Posted by Bryan83taco View Post
It’s for 2004+. The front sprocket and and rear pulley dictate gearing, 883 vs. 1200. Please correct me if I’m wrong.
You're right but there's also the primary gearing, the crank and clutch "sprockets".
883's get 34t on the crank while 1200's have 38t.
Both have 57t on the clutch.
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Old 9th December 2019
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The 2006 saw some transmission changes as well
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  #10  
Old 9th December 2019
Bryan83taco Bryan83taco is offline
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Quote:
Originally Posted by Tomcatt View Post
You're right but there's also the primary gearing, the crank and clutch "sprockets".
883's get 34t on the crank while 1200's have 38t.
Both have 57t on the clutch.
Ahhh I see, thanks for the correction. Do you see any issues with running a 1200 belt to chain conversion on an 883 primary? I’m really just looking to lower the RPMs for 70+ MPH interstate cruising.
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