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Sportster Motorcycle - Bottom End Cams, Cases, Gears, Flywheel, Piston Conecting Rods, Oil Pump, etc...

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  #1  
Old 4th June 2019
nightblaster nightblaster is offline
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Default I need help sourcing a stroker crank

I am hoping against hope that someone on this forum can help me. I have a 2009 Nightster and want to do a build that includes stroker flywheels (4 5/16"). I called 5 different companies today and got the same answer from them all, NO can do. With that said I realize that what I want would have to be special made and need every ones help in hopefully locating anyone willing to take this on. With all the internet reading I have done in the past I have to believe if nothing else some one across the pond has gotta be able to handle this. Pretty ingenious people over there doing whatever they have to to build awesome bikes.
Please help me,

Tim
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Old 4th June 2019
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Wouldn't you have to modify the cases, for such a long stroke? I've always thought that you can't get a 4" stroke, much less anything larger, to work without modifying the cases and bottoms of the jugs. (sorry, but this is all recollection of past discussions and may not be accurate)
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Well, to be honest I am about to learn all I need to know about all that. I just don't want to give up just because some one else sees road blocks. I really haven't had but 1 exposure to the insides of the 04 and newer cases. I do know that if I had an 03 or older motor I could do it. So, I want to push forward. Truett and Osbourne said that the problem as they see it is no shafts are being made, otherwise they could help me.
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S&S makes a 100 cube Sportster engine that has a 4" stroke and 4" bore, but they have longer cyl. and S&S cases. Saw it on Zodiac's website.
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Even if a crank was available, you'd need frame mods. Making the stroke longer makes the motor taller, and it doesn't fit anymore. You'd also have to leave room for the motor to move around, because it's rubber mounted.

It would also require a wider intake manifold (which no one makes for your EFI) and a custom exhaust.

So it's a lot of trouble. By comparison, you can get to 90ci on bore instead, and the motor stays the same height and everything still fits.

At the end of the day, going long stroke instead of big bore is a lot more trouble and has no advantages. That's why it's never been anywhere near as popular as the big bore kits, and in fact for the rubber mounts, nobody has even bothered to engineer the crank, as you've discovered.
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Quote:
Originally Posted by Toejam503 View Post
S&S makes a 100 cube Sportster engine that has a 4" stroke and 4" bore, but they have longer cyl. and S&S cases. Saw it on Zodiac's website.
Doesn't fit the rubber mount chassis.
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Quote:
Originally Posted by aswracing View Post
Doesn't fit the rubber mount chassis.
Yeah, all I saw was '91 - present, and may need some frame modification on certain models. Thanks for catching that. I think you would need some really big cases to fit a 4.65 stroke. (Nitrous, anyone!)
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super duper +++1
hammer to the rescue, always informative!
my take is stroke is good but leads to other issues.
how about using what you have with boost, yes true, some issues but i would rather deal with those than a big stroked out engine.
shoot the hammer deals are not sleazy, put some super glue on the seat!!!
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  #10  
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nightblaster nightblaster is offline
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Default

Thanks for the replies. I was aware that what I want would require frame and exhaust modifications but thank you for pointing out the issue about the manifold. Hmmmm....$700-1000+ maybe custom manifold. Still not detour yet. Just not the guy willing to give up readily.
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