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

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  #11  
Old 2nd February 2016
dkarma dkarma is offline
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Quote:
Originally Posted by 8ball View Post
I don't know the differences but didn't the head bolts change mid 73 I'm sure that has something to do with it
Yes the early 73 and before have 6 point bolts for the heads while later 73 and after have the 12 point... the 12 point are longer as well so you can't use the 12 point on early 73 or before heads as they're too long and you can't use early 73 bolts on a late 73 or after because they're not long enough IIRC
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  #12  
Old 2nd February 2016
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Simply Solution for Hunting at Swap Meets, keep a 1972 and a later 1973 > Head Gasket with You... Happy Swaping
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  #13  
Old 2nd February 2016
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http://www.ebay.com/itm/HARLEY-IRONH...pWp5Wt&vxp=mtr
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  #14  
Old 2nd February 2016
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a good price
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  #15  
Old 2nd February 2016
60weight 60weight is offline
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Originally Posted by 72 Ironhead XLH View Post
a good price
Yup. Id recommend the 82 up head gaskets also
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  #16  
Old 2nd February 2016
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60 weight What was the head gasket change?
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  #17  
Old 2nd February 2016
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Gaskets are thicker...fer lower compression i believe, and fer lower octaine gas
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  #18  
Old 2nd February 2016
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Quote:
Originally Posted by Shovelpeter View Post
Hi Folks,
I´m looking for some new jugs for my 1976 Sportster. Part # is 16464-73 (front) and 16465-73 (rear) for the piston/cylinder combination. So far so good, but there is an appendix at the end: -73a, -73b, 73c. Does anybody know what these last letters mean? (My thought ist different compression, but I don´t know for sure). BTW: the 1979-1985 parts catalog mentions the # -73c...

Cheers, Peter
If your question is more about what are the correct jugs for my '76, the answer is you will need Late 1973 up jugs to match your stock heads(if indeed your heads are stock).
The Early 1973 and down 1000cc jugs have a different bolt pattern and will only work with Early 1973 1000cc heads.
Dkarma is right also about the bolts and the cylinder wall thickness.

I thought this was noted in the stickies somewhere, as DrDick has a very explicit explanation of this variable.
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  #19  
Old 2nd February 2016
Shovelpeter Shovelpeter is offline
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Hi Folks,
thanks for the explanations and the warm welcome. I read the notes about pre 73 jugs and I´m confident about the difference. I just wondered if there is any significant difference between the that cylinder/piston combinations. I suspect as mentioned above that it just describes minor changes. About the swapmeets: I´m from germany and there are very few swapmeets for Harleys and even less parts for Ironheads. Some must be very lucky to find something even for a price. It´s also special buying parts in the US: Many private sellers don´t ship to oversea (the guy from ebay also doesn´t), the shipping is quite expensive and I have to pay taxes and import dutys on top. And if the part doesn´t fit or is scrap I´ve got a problem returning it (same story back: shipping and taxes). But anyway: the rear cylinder of that ebay-auction looks different from mine as it has rectangular "extension" at the gasket-surface. Probably one of the changes (which will not affect the function IMHO).
Cheers, Peter
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  #20  
Old 2nd February 2016
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Quote:
Originally Posted by Shovelpeter View Post
Hi Folks,
thanks for the explanations and the warm welcome. I read the notes about pre 73 jugs and I´m confident about the difference. I just wondered if there is any significant difference between the that cylinder/piston combinations. I suspect as mentioned above that it just describes minor changes. About the swapmeets: I´m from germany and there are very few swapmeets for Harleys and even less parts for Ironheads. Some must be very lucky to find something even for a price. It´s also special buying parts in the US: Many private sellers don´t ship to oversea (the guy from ebay also doesn´t), the shipping is quite expensive and I have to pay taxes and import dutys on top. And if the part doesn´t fit or is scrap I´ve got a problem returning it (same story back: shipping and taxes). But anyway: the rear cylinder of that ebay-auction looks different from mine as it has rectangular "extension" at the gasket-surface. Probably one of the changes (which will not affect the function IMHO).
Cheers, Peter
If you're talking about the second picture, the aluminum rectangular section is the tops of the pistons that are shown in the first picture.
I'd ask the seller to give you a good pic of the inside of the jugs to see if it looks like any deep scoring,or,just ask them.
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