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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #1041  
Old 11th September 2019
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Quote:
Originally Posted by boomerguy View Post
There is a fairly new hardback/"coffee table" book about the history of the Sportster. The author talks about his 883 that he rode as stock until it needed some work at 45K miles. He had the 1200 conversion kit done to it but left the original smaller valves in it. He preferred this combination because he said it gave more low-end torque and less high-end speed. This is exactly what I plan to do when my 883 needs some major work done.
I don't care about the interstate but I love the mountain twisties. The higher low-end torque combined with the shorter gears of the 883 will make a "stump-pulling" monster.
Well... that´s what I am doing... 1275 kit with stock 883 heads... will see!!!

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  #1042  
Old 11th September 2019
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The waayyy better heads of a 1200 would pull bigger stumps and much easier. Especially with a 28 tooth final.
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  #1043  
Old 15th September 2019
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Got interested in Sportsters about 2 years ago and rented two for a full day to see if they were right for me...the accompanied test rides I'd done were not enough to know. First time was an 883 Iron which didn't do too much for me, second was a 1200 Roadster that I liked a lot and I eventually bought one.
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  #1044  
Old 15th September 2019
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Quote:
Originally Posted by Highly-Dangerous View Post
Well... that´s what I am doing... 1275 kit with stock 883 heads... will see!!!

That is what I did to my 2016 iron 883 , Hammer 1275 kit , ported my 883 heads and kept the stock sized valves , n4 cams , powervision, Vance and Hines , short shots . I’m happy , now I have room Down the road to find some Xb heads and have them worked over before I buy my next hammer kit for the rebuild when it’s time . I’m keeping my eyes open for some heads now . Bike is really fun off the line . Plenty more power than my buddies factory 1200 stage one .... fun bike ..... but I’ll want more ina couple of years lol .... keep the hammer guys in business I guess LOL my only regret is not sending my 883 heads to hammer to do the work, I won’t make that mistake again , I may not even buy new heads down the road , they do great work with 883 heads so I may have mine done over .
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  #1045  
Old 15th September 2019
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This pretty much sums it up in a nut shell...

Quote:
Originally Posted by addertooth View Post
apples, oranges, bananas...

Stock to stock 1200 heads outflow 883 heads
stock to stock 883 heads have a better squish zone than 1200 heads, allowing a higher compression ratio without the risk of pinging...
stock to stock 1200 heads have larger valves, and higher better flow above 4500 rpms....
stage 2 to stage 2 1200 heads require less machining to achieve the same flow numbers as a 883 head
stage 3 to stage 3 (welding up the ports and re-machining, oversized valves, recontoured combustion chamber) The award goes slightly to the 883 head...
Stage 1 XB (or 2004 and up 1200 head) versus stage 3 883 heads... The XB style head performs better... stage 2 and up XB heads are dramatically better than anything that can be achieved through machining or voodoo with an 883 head.

Now real world... You are a smart guy with a dremel tool.... You can get more performance HOME porting a pre-2004 1200 head than you can with a 883 head. Read my signature before you ask how I would know.

If I had it to do again... I would use an XB (post 2004 1200) head to do my performance build.

If I want to get into the 70 HP club, and I want to do it cheap... 883 heads... 3.500 forged lightweight pistons... Cams.... Jets for carb....Gaskets.... Less than a thousand spent, and you will gain about 35 horse assuming you have a good exhaust and breather already.
With your Low 883 gearing you will be beating the factory stock 1200s on a stoplight to stoplight drag race.
You will have to figure out what kind of rider you are... will you want a few more HP, and be satisfied, or will this HP pursuit be a never ending quest. Most people fall into the latter catagory. If you are the latter type.. start purchasing parts so that you won't have to remove them at a later point.

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  #1046  
Old 1st October 2019
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Quote:
Originally Posted by 60Gunner View Post
This pretty much sums it up in a nut shell...
Problem for me is that it is NOT easy to find good used heads over here... neither can send mine to Hammer... neither know someone who I can trust to do do a decent porting job... I think I am pretty much stuck with my stock 883 heads!
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  #1047  
Old 1st October 2019
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Why can't you send them to Hammer?
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  #1048  
Old 1st October 2019
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Quote:
Originally Posted by Folkie View Post
Why can't you send them to Hammer?
- Distance (I am in Spain).
- Trouble with Customs on their way back into Spain.
- Time down without the bike.
- Expensive all together!!!

Maybe I would be better off buying a new set of heads? Expensive too... almost (or more) than the Hammer kit itself!!

You wont know any in the UK by any chance???

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  #1049  
Old 2nd October 2019
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Rocketmangb has a couple sets of heads for sale.
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  #1050  
Old 2nd October 2019
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Quote:
Originally Posted by Highly-Dangerous View Post
- Distance (I am in Spain).
- Trouble with Customs on their way back into Spain.
- Time down without the bike.
- Expensive all together!!!

Maybe I would be better off buying a new set of heads? Expensive too... almost (or more) than the Hammer kit itself!!

You wont know any in the UK by any chance???

I use this site quite a lot...

https://www.leboncoin.fr


Click on any region,
In box at top of page choose Equipment Moto,
In center box type Harley Davidson,
In right box delete the chosen region (this gives you all of France).
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