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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 6th April 2012
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Default twin carbs on a iron head

currently collecting parts to build a trad styled cafe racer around a iron head motor and a fetherbed frame

looking at running a reversed rear head on the front so that I can run an exhaust out each side of the bike

this will also allow me to run twin carbs

what size carb would be hest for this and what would people recommend

please don't recommend amals as they were crap 40 years ago and I'm in the process of replacing the amals that have never worked on my bsa with mikunis
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Old 6th April 2012
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before the thing will even run,you need to change the cam timing,on the rear cylinder,because the intake and exhaust valve locations ,are now reversed. its not a,simple swap.normally 2,front heads are used.
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  #3  
Old 6th April 2012
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If it were me, I'd bring the rear pipe through the frame to have it on the left and keep the single carb.

If you're dead set on doing the work to swap the heads, look for carbs for 500cc singles & use two of them.
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Old 6th April 2012
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looking at running a reversed rear head on the front so that I can run an exhaust out each side of the bike

where have you seen this before?
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Old 6th April 2012
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Quote:
Originally Posted by brucstoudt View Post
looking at running a reversed rear head on the front so that I can run an exhaust out each side of the bike

where have you seen this before?
I haven't seen it done but it probably has been done

but have looked at all the options and this looks the cheanest way of getting the exhaust headers where I want them
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Old 6th April 2012
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Yep, it'll work and look like this one, early 70s from my friend Jim Haubert:



He used 2 Tillotsons... NICE!!! But if you used 2 rear heads, cam timing will stay the same...

Patrick
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  #7  
Old 6th April 2012
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would s&s b's be too big?

or would I need to get down to something around 32-35mm
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Old 6th April 2012
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Default Ironhead

Don't know about Amal's (The new ones that is) being rubbish. Bruce runs them on his dual carbed outfit and he holds the lap record at Broadford. From memory they're 38's but I can ask him if you like.

Had he asked me before he did this I would have told him that HD tried this arrangement back in the late 60's and it really didn't help. To really get any benefit you do need to use the reversed head trick. But the truth is if it's just performance your after I'd spend the money on making it BIG first. You can build a 100HP Ironhead when no limited to capacity rules.


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  #9  
Old 6th April 2012
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Quote:
Originally Posted by Ferrous Head View Post
Don't know about Amal's (The new ones that is) being rubbish.
was thinking about mk1 amals - and they are crap

never thought about mk11
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  #10  
Old 6th April 2012
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is that a,choke plate in the velocity stack?
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