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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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  #11  
Old 26th November 2004
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Ya know, it's strange that there are so many folks getting lower than what I'd expect HP from XB headed bikes. I'm at a loss for ideas. But geeze, what's the good of these new heads if they can't do better than Thunderstorms?
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Old 26th November 2004
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Nallins makes a lot of power with em but they spin the bikes to 7000rpm's plus. The average guy can't afford to put that kind of money into bottom ends and stuff. I don't think my motor would last to long at those rpm's. The folks that did my heads said they are better than previous heads but the valves and ports are to big. He gets more power and torque out of the 883 heads. He has an 04 1200R with 04 883 heads, wiseco 9.5 to 1 and factory cams making more than 80ft lbs. Of cours it has no top end with the factory cams but I have a lot of work in to mine and just cracked 80ft lbs with custom made N3's. There is a good artical to read about his work here if you want to read it.

http://cycledoctor.com/JohnsonArticles/JET.html

and this one

http://cycledoctor.com/JohnsonArticles/Head.html

It makes sense and has worked well for him. He did a Dyna I had a few years ago and it made 100/100 at the wheel. 10 to 1, .010 over wiseco's, his heads, 560 cam, T-header and an S&S super E w/intake modified by him. And it made that HP at 6200rpm.

He won the HP shootout one year in Daytona with his 80 cu in FXR back in 85 or so. It made 114 Hp at the wheel. He let me ride it and it was a blast.
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  #13  
Old 26th November 2004
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Barry ...

Very interesting reading!
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Old 26th November 2004
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i noticed that ...there hp dyno was at 7500 rpm. Some time this winter i will spin mine that high on the dyno, but not for real life. i will set the cieling at 6800 and the shift light at 6500. I am interestd in what it will pull that high...its doin 124 at 6500 some who knows....
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Old 26th November 2004
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I think the people who are getting mid 80s are likely on optomistic dynos.
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  #16  
Old 26th November 2004
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Dyno's tell lies too...

I've had my '03 gsxr 1000 on a local dyno and it only showed 131.2.....

My mate on the same dyno won the day with a 135......

Now his bike had been dyno'd at 159.8 on another dyno.




I don't know what my sporty was puttin out BUT it ran high 11's all day in full street trim...changin at 6300....


I havn't seen a set of XB heads but I think some of the benefits are from a flat quench area....this is also possible with 883 heads...so it would explain the apparent lack of extra HP over good ported 883's
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  #17  
Old 26th November 2004
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OK - here's my question, b/c this has been bugging me. Everyone refers to them as XL1200R heads. Does that mean that the XL1200C's don't have the same heads? I don't have a parts manual, so I can't confirm this for myself. It would seem silly to have 2 different parts for the 1200's - especially when they share with the XB's. So that leads me to believe that we're just calling them 1200R heads, when they're really 1200R/C heads.

Thanks
Speedy
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Old 26th November 2004
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No, they both have the same heads. 1200C and 1200R wear all the same parts just different colors, black or powdercoat.
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They mean all 04-05 XL1200 heads. (Custom & Roadster)
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