How to Install a Big Bore Kit In a Milwaukee Eight Engine | Weekend Wrenching

As the old saying goes, “there ain't no replacement for displacement” . And in this video we show you how to add those extra cubic inches to your Milwaukee Eight powered machine. This installation will be the same for Milwaukee Eight powered Softails and touring bikes. It also doesn’t matter which displacement you're moving up to, 124”,128” or even 131” this video is the one for you and your build.


For the install you will need these:
Set of standard hand tools
File

[scottluna]

I just got a 129 big bore kit with 550 gear cam for my ‘19 SG. This video will help me big time with my install. Thanks for this great video.

[olpanrider]

Great Video, I own the exact same ring compressor. It works much better on a Harley if you flip it over so the Bottom stamped marking is "UP" its marked bottom for a car piston not a harley (on a car the piston skirt goes in cylinder first on A Harley the piston dome goes in cylinder first)

[SRR]

Wicked vids love it, don’t forget to re torque them studs though they’ll wind out when their undone 👍🏼

[oldyeller]

I've done it the other way as well. Push piston and ring up thru bottom of cylinder then lower it too the rod and put wrist pin n c_ clip on.

[stephendwinells]

That light solvent is that brake clean

[Jhood_jerrymesser]

Is there a 2nd video finishing the kit? The top end im referring to

[johnbeardsley]

is going to 12 to 1 compression a problem and what other changes are needed to run correctly

[SwarnimAgrawal]

Should I go for the 131 crate engine by screamin eagle or s&s cycle 132 power kit? I use my bike for long distance touring

[ericcarnegie]

I have just finished the big bore kit, I cannot find torque specs for motor mount bolts. 2017 ultralimited.

[roncoburn]

sometimes its a bitch by yourself sliding the cylinders on.good video

[BBD]

It’s common for big bore kits to use forged pistons. Why is forged preferred over hypereutectic? Hypereutectic have less thermal expansion and contraction properties and are just as capable of supporting these levels of performance

[js-amg]

Great job Patrick. But I didn’t see ya hone the bore to get that x hatch pattern for the rings.

[tonybattaglio]

Hey I put one in and have piston slap, ever heard of this?

[stephenwilliams]

May seem very butch but, speed limits are always being monitored by camera and radar.

[betruly]

I have a real bike XL1200T and I'm not feeling jealous at all. 😂

[OhioGuy]

Call me silly but.. 1868cc isn’t enough you should probably just buy a faster, more powerful bike.

[allanable]

can put pistons in the cylinder first then install and put in gudgeon pin? be easier?