Found a piston crack
Seasoned HDF Member
Joined: Mar 2021
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From: backwoods
Ok, I don't know anything about m8s.
But if his lifters got 70k on them it is foolish to open up and leave them. Especially what I hear about lifters these days.
I will admit I know nothing about m8 cams. If they have bearings then at 70k I would look at doing it.
An engine with 70k miles needs attention, despite all the people who go forever
But I believe I said early on just bore 10 over and get new pistons
But if his lifters got 70k on them it is foolish to open up and leave them. Especially what I hear about lifters these days.
I will admit I know nothing about m8 cams. If they have bearings then at 70k I would look at doing it.
An engine with 70k miles needs attention, despite all the people who go forever
But I believe I said early on just bore 10 over and get new pistons
Seasoned HDF Member
Joined: Mar 2021
Posts: 18,458
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From: backwoods
Which one of us needs to admit their wrong?
Would be really funny if you were the one wrong,don't you think?
Seasoned HDF Member
Joined: Mar 2021
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From: backwoods
Is this a twin cam? From post 1.
Did any models get m8 sooner? I think of 2016 as TC
AI generated
In 2016, the Milwaukee-Eight engines became available on Touring and Trike models of the 2017 model year
Did any models get m8 sooner? I think of 2016 as TC
AI generated
In 2016, the Milwaukee-Eight engines became available on Touring and Trike models of the 2017 model year
Last edited by Rounders; Aug 10, 2024 at 10:28 PM.
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,158
Likes: 11,249
From: San Diego, CA
I have to agree with Rounders....
A 2016 FLHXS is a Twin Cam engine.
It will have the subpar HD "C" lifters. I replace the OEM lifters, and the OEM inner cam bearings, if I open up the cam chest of any Twin Cam, regardless of mileage. if the OP has never had them replaced I would certainly replace them at 70K miles.
FWIW... at least the first few years of the M8 engines, they also used the subpar HD "C" lifters...
NOTE: I just checked and they still use the subpar "C" lifters in 2024 M8's......
Last edited by hattitude; Aug 11, 2024 at 09:02 AM.
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Road Warrior
Joined: Mar 2013
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From: Lost
Could this be due to all of the different opinions you have been given in this thread by those that have never even seen/heard your bike?
You were satisfied with it before this break occurred, so have the repair done, and nothing else. Then see whether or not you're still satisfied with it. Not that it matters what I would do, but to not replace both cylinders and both pistons at the same time seems like a shortcut to me.
You were satisfied with it before this break occurred, so have the repair done, and nothing else. Then see whether or not you're still satisfied with it. Not that it matters what I would do, but to not replace both cylinders and both pistons at the same time seems like a shortcut to me.
With that said I guess what everyone is saying is to upgrade/replace parts while Im in there. Not a bad idea. Better to do that now than later. I was just not planning to do this. When I add all these Im trying to figure if its worth it or just replace the bike. Add to that I dont know anything mechanical or internals of Harley. So Im just writing down whatever suggestions Im getting here and look for parts.
Im going to request the service department to see if their tech is willing to sit down and talk to me. Maybe go through all the parts that need upgrading while we are there. Do it once and be done with it. I dont mind getting a new bike but New bike is not really pulling me, not getting me excited yet.
The quote I got from Harley is for new pistons but not cylinders. They said they will work on the cylinders for new pistons and put it back. Ill check with them for new cylinders. Thx.
Last edited by pyuchem; Aug 11, 2024 at 09:20 AM.
Club Member
Joined: Apr 2016
Posts: 11,588
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From: Inland NW
One thing is for sure, you don't know what you don't know. You may be thrilled with a bit of torque increase.
You could have them install the SE585 cams, and new lifters, along with the SEPST and the tune that goes with this set up. It would give you a decent boost in torque for those mountains we have in MT, ID, and those awesome rides in Canada!
Good luck!
You could have them install the SE585 cams, and new lifters, along with the SEPST and the tune that goes with this set up. It would give you a decent boost in torque for those mountains we have in MT, ID, and those awesome rides in Canada!
Good luck!
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,158
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From: San Diego, CA
If budget is a concern, and/or you are satisfied with the bike's current performance, I would;
Replace the piston with same OEM.
Let them recondition the cylinder if they are able. If not ,buy a new OEM cylinder.
Inspect the oil pump and only replace if serious wear or damage.
Obviously, replace anything that shows to have serious wear and/or damage when the engine is disassembled.
The only "upgrades" I would do would be:
1) Get rid of the crappy HD "C" lifters and get a set from WFO Larry; 2313, 2313S, or 2313SE... depending on budget. All three are very good lifters at a reasonable price. All three are superior to the HD "C" lifters (the 2313 are OEM replacements, the others have additional benefits).
2) Get rid of the OEM INA brand caged, inner cam bearings. Replace them with the Koyo (formerly Torrington) captive needle bearings.
I have the sickness and would use it as an opportunity to do a bunch of mods.
However, if you are satisfied with the current performance, are contemplating a new bike, and/or just don't like throwing a bunch of money at an older, high mileage bike, I would take the path listed above......
Good luck and hope you get it repaired quickly..
Replace the piston with same OEM.
Let them recondition the cylinder if they are able. If not ,buy a new OEM cylinder.
Inspect the oil pump and only replace if serious wear or damage.
Obviously, replace anything that shows to have serious wear and/or damage when the engine is disassembled.
The only "upgrades" I would do would be:
1) Get rid of the crappy HD "C" lifters and get a set from WFO Larry; 2313, 2313S, or 2313SE... depending on budget. All three are very good lifters at a reasonable price. All three are superior to the HD "C" lifters (the 2313 are OEM replacements, the others have additional benefits).
2) Get rid of the OEM INA brand caged, inner cam bearings. Replace them with the Koyo (formerly Torrington) captive needle bearings.
I have the sickness and would use it as an opportunity to do a bunch of mods.
However, if you are satisfied with the current performance, are contemplating a new bike, and/or just don't like throwing a bunch of money at an older, high mileage bike, I would take the path listed above......
Good luck and hope you get it repaired quickly..
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Road Warrior
Joined: Mar 2013
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From: Lost