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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #21  
Old 20th August 2018
lmarshall73's Avatar
lmarshall73 lmarshall73 is offline
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Originally Posted by Cropduster View Post
You will probably need framed picture of your drivers license so you can look back fondly at it.....

I would seriously consider heads from Hammer, their kits are bang on and what they told me mine would make, it makes, went together effortlessly too. If you're using their big bore kit and more importantly, their cams, use the head mods they recommend over the SE stuff, you will get more for your money IMO.
My goal was to go as far as I could without requiring any machine work/extended down time (living in Florida, there is no off season for riding). The entire upgrade is being paid for with a bonus, so there is definitely a budget to stick to. My first option was to go with a mild build, foregoing heads and relying on N4 cams and swapping to an HSR42. I found a screaming deal on the SE heads (see what I did there?), so I shifted the build in that direction, pushing the carburetor / manifold upgrade to later.

Of course, the backorder date on the SE heads has changed twice, so I may end up sourcing some heads to have ported sometime down the line.
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  #22  
Old 27th August 2018
jkinkade jkinkade is offline
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Sportster/Buell Model: XLH 88" 2003.
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Originally Posted by Folkie View Post
Apparently you can, but I've never heard of anyone doing it.
Folkie , I have seen a few Eco Sporty stroker's, but I would not build one myself. as built a Shovel stroker big twin years back ( it's still going ok ) And I learnt all the extra things you need to do, like the motor can get longer than stock, so need different intake manifold as heads get wider apart . Also sometimes have to make changes to the frame to fit longer motor in. they also have higher piston speed. so I'll stick to just larger bore myself. but seen some 89" EVO sporty strokers.
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  #23  
Old 20th September 2018
farmall farmall is offline
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I just picked up a garage sitter '92 with the S&S 89" kit, S&S heads (presumed unported because the intake runners were still as cast) cam unknown (elderly previous owner had the work done and doesn't remember), Super E, and drag pipes. The downtubes are stretched about an inch (I haven't measured the welds center to center). The rear rocker box area is VERY close to the box. When I have it down for powder coating I'll whip out the rosebud and heat'n'beat a bit more room. I don't consider the frame changes much work and they are easy to have done precisely if you don't weld. The engine case mods are machine work but not complicated.

Got it running after making one starter out of two and a carb soak. First impressions are gobs of torque and quite nice to ride.

It would be interesting to do a big bore stroker for the best of both worlds...
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