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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 25th February 2009
Richard D Richard D is offline
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Default Horsepower and Weight Specs

Quoting from here:
http://www.sportster.org/history/index.shtml#1953
"1972:
The 61 cid (called a 1000cc) XL replaced the 900.
Rated for 61 hp, 9:1 CR, 110+mph, 13.38 sec ╝ mile (97.7 mph), and 43 mpg. Bendix/Zenith carb.
Wet clutch.
New oil pump.
Oil tank placed near chain
Seat is thinner w/less padding.
Production Information:
XLH (7,500) $2,120
XLCH (10,650) "

That was the last entry before '77(my year) that listed horsepower, I assume it didn't go down.

I also remember reading smewhere that
"all Sportsters weigh less than 500lbs."

Do these figures sound accurate? What would the weight reduction be with a weld-on hard tail?
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  #2  
Old 25th February 2009
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flathead45 flathead45 is offline
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my 72 is a small bike, its still the 900 frame, just a 1000 engine. so it might be lighter than 73 and its heavier frontend.

but different models have different weights in any given year.

HP should be about the same through the 70's
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  #3  
Old 25th February 2009
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dwint dwint is offline
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when i took my 72 to my machinist (he was in his early 60's)i told him i should have 61 hores.he started to laugh saying back then they did'nt have accurate dyno's and i bet you don't have more then 45 horses.with 10to1 -40 over and drags it was 46 rwhp.so he told me of his friend down the street would get some more h.p out of it.well when i went to pick it up the dyno showed 56 rwhp.so he got me 10 more horses.i asked what did you do to get so much more.he adjusted the carb and put 1/4 inch bolts threw the drags.i could'nt believe 56 hp had so much power,so i figured i would try the bolts in my wifes 95 1200 with drags and it whistled like crazy.i looked at mine and noticed the dyno guy grinded off the threads so i did the same and no more whistle.it's funny how the old timers no these little tricks.
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  #4  
Old 25th February 2009
Richard D Richard D is offline
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Quote:
Originally Posted by dwint View Post
when i took my 72 to my machinist (he was in his early 60's)i told him i should have 61 hores.he started to laugh saying back then they did'nt have accurate dyno's and i bet you don't have more then 45 horses.
I forgot to add I read the same thing, on page 100:

http://books.google.com/books?id=cM9...um=6&ct=result
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  #5  
Old 25th February 2009
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jagdprcp jagdprcp is offline
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The first spec was horsepower at the crank. Your primary, transmission and final drive all play in to figuring RWHP but would account for only having 46HP at the rear wheel (RWHP.) The only way to know what your bike weighs is to take it somewere and have it weighed.
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  #6  
Old 26th February 2009
Richard D Richard D is offline
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As far as weight, what's a rough estimate? A stock Sporty, under 500lbs?
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  #7  
Old 26th February 2009
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my 72 was 472 pounds
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  #8  
Old 26th February 2009
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SirAsh SirAsh is offline
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my 79 hd service manual says as shipped from the factory xlh-522lbs xlch-513lbs
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