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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 21st July 2019
CDeckner CDeckner is offline
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Default Upcoming 1275 hammer upgrade carb choices

I’m in the works on an ‘89 883 to 1275 upgrade. Well actually a 1200 to 1275 upgrade. I bought a project and when I finally got it running I discovered a hole in the rear piston. I disassembled the top end to discover the 883 cylinders was bored to 1200 and it look like someone opened up the cylinder chamber on the heads with a die grinder. Given that the whole engine was rattle canned black I’m not surprised.

I’ve bought some ‘86 bathtub heads and my crank sent off to hammer getting the impact treatment. I’m excited to get this engine back together and munch some miles.

The bike came with an S&S super E when I bought it. I was planning on running it when the time comes. I know hammer recommends a Mikuni or rejetting a CV. Is anyone running one on their builds? Any jetting recommendations from stock? Or should I pick up a cv and intake and jet as hammer recommends?
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  #2  
Old 21st July 2019
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I would go to the HSR 45 Mikuni
I ran one on my '06 1200 as a Stage I and after a full 1250 build
Just installed a 48 on the bike,sounds good !
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  #3  
Old 21st July 2019
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The stock CV carb is horsepower-limited, but if it's not the "weak link" in your build then that doesn't matter. Then again, too small of Mikuni is also limited.

Some really like the Mikuni for throttle response - it is better. Tuners like it because it's much faster to change jets, etc.

I have chosen to stick with the CV for a few reasons:
1) I already own it
2) It works better at varying altitudes
3) I prefer riding over wrenching. I put on lots of long miles (see #2). So I'll take the little extra time for tuning, and then be done wrenching for many thousands of miles, don't care that the Mikuni is easier for making adjustments.
4) It is not the "weak link" in my build. It would be fun to have better throttle response, but that doesn't outweigh the above factors.
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Old 21st July 2019
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I went with the 45 mikuni
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Old 21st July 2019
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Got a steal on a new 42 or I would've gone with a 45. Plenty big enough for my build. I'd never go back to a vacuum operated slide now.
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  #6  
Old 22nd July 2019
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I run a Super E, not on a 1275, but a descent performing 1200 putting out mid 90's HP. Since you already own the E, I see no reason to spend the extra money for something different. It's a relatively easy carb to tune and to get to run well, since you are dealing with only the intermediate and main jet circuits. Start with a 295 intermediate jet, and probably a 70 or so main jet. S&S has good instructions on their site. Some of the attraction of the E (and the main reason people always knock it) is the simplicity of the circuitry. It makes it fairly easy to find the best jetting; then you can stop screwing with it and just ride!
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Old 22nd July 2019
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With that build I would highly recommend the Mikuni 45. Why spend all that money on a screamer and choke it with an inadequate carb? Nothing will tune that bike better than a Mikuni.
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Old 22nd July 2019
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Quote:
Originally Posted by RussW View Post
I run a Super E, not on a 1275, but a descent performing 1200 putting out mid 90's HP. Since you already own the E, I see no reason to spend the extra money for something different. It's a relatively easy carb to tune and to get to run well, since you are dealing with only the intermediate and main jet circuits. Start with a 295 intermediate jet, and probably a 70 or so main jet. S&S has good instructions on their site. Some of the attraction of the E (and the main reason people always knock it) is the simplicity of the circuitry. It makes it fairly easy to find the best jetting; then you can stop screwing with it and just ride!
I do run a Super G in my S&S 117 ci and I like these Carbs for their simplicity to tune... the S&S are good Carbs.

but then...

Quote:
Originally Posted by jharback View Post
With that build I would highly recommend the Mikuni 45. Why spend all that money on a screamer and choke it with an inadequate carb? Nothing will tune that bike better than a Mikuni.
I don´t think the S&S Super E would choke it.... but yes, nothing can beat a Mikuni.
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  #9  
Old 22nd July 2019
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I'd go with the builders recommendations. My 2¢.
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Old 22nd July 2019
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Not carb related but I would also pay atention to a weak primary design on this 4 speed engine...
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