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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 4th June 2019
panama86 panama86 is offline
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Question Big bore stroker cases, need a recipe.

Hey all,
I'm new here. I don't have a sporty but I do have a set of molested 72 Ironhead cases. My main bike is a 51FL and other project is a 79 FXEF.

I have a spare FX roller and had considered modifying the frame to take evo running gear but then I came across some photos of shortsters online and thought it could be a good project to leave the frame mostly unscathed. A friend of mine mentioned a fella locally had a set of cases that had already been divorced and had also been set up for big bore cylinders and 4 5/8" stroke. I picked them up and now I am trying to make a plan as to what I should do with them. Or if I am going to dig myself a deep and expensive hole and should bail out now. The bike wouldn't be an everyday rider but it would be for street use only.

The bloke I purchased the cases from gave me a rundown on what had been done, the holes for the cylinder spigots have been opened up to 3 7/8", they have also had rod clearance slots cut, pushrod area has been reinforced and new oil passages added. Obviously, the divorce is still in the works, much like my own. He also mentioned there was a boss shaved down inside the right case to allow for better oil flow. overall they look in pretty good shape, albeit grimey.

So to the questions:
- Is there anything else you can notice in the photos that has been done or that I should be worried about
- What size cylinders should I run to fit in that 3 7/8" hole in the cases, 3 7/16"
- I know I am already starting with cases that probably aren't the best for reliability and street use. I'm looking for opinions on what components I should be running here, what pistons, top end work etc
- It seems like a lot of the heavy lifting has been done on the cases already and as I am in Australia and there's not a lot of guys capable of the machining work required I figured maybe I could buy the barrels (trock?) and have the head work done in the US and final assembly locally. The bloke who built my pan does a good job and has a lot of knowledge but doesn't have experience with something like this

I am very green on performance stuff and even greener on Sportster stuff so forgive me if these are rookie questions.

Here is a link to all the photos of the cases

Thanks for your time.
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  #2  
Old 4th June 2019
panama86 panama86 is offline
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Photos:










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Old 4th June 2019
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I'll move this to the Ironhead section where you'll get more response on this.
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Old 4th June 2019
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Thanks Folkie, wasn't sure where best to post it.
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Old 4th June 2019
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Where you posted it would have been finally normally (for a more recent year bike), but the Ironhead guys tend to stay in the Ironhead area, and may not even see a thread somewhere else.
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Old 4th June 2019
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You need to get in touch with Ron jr...
http://xlforum.net/forums/archive/in...t-1673993.html
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Old 4th June 2019
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I have been doing some reading and read that his son producing jugs again. I might call him up shortly. I have also reached out to Nitro Frankie as he seems to be pretty knowledgeable on this type of thing.
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Old 4th June 2019
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I would not attempt a big bore in stock cases.

I would use the Sputhe cases that offset the cams outboard to make room.
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Old 4th June 2019
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Where would you find the Sputhe cases? Alan Sputhe died 3 years ago and he hadn't made any cases for years before that? One thing that was done a couple of times for a big bore motor was to use the wider big twin crankpin and rods and make a spacer between the case halves and make cylinders for the new wider base pattern.
The Allen plugs in the breather cavity under the cams are usually used for oil drains from the rocker boxes.
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I've never seen flat top pistons like that in an ironhead motor.looks like they turned the domes down to nubs.
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