Top end refresh for a 2020 M8 117"

[scott7d]

Last summer I found a guy with the same 2020 CVO Road Glide who had a crate 131 installed before ever picking up the bike. He sold me his OEM heads, pistons, and cylinders for $500. Not a single mark or signs of usage on any of the parts.

My bike is getting up there in mileage so had plans this winter to swap my parts out with what I got from him. Aside from more oil consumption and gas mileage not being what it used to, the bike still runs good. The cam chest had a recent service and crank runout was fine. While we're doing some more invasive work, is there anything else we should check out aside from basic wear items? I didn't know if there were things with the lower end that should be looked at or just take the "if it ain't broke, don't fix it" approach for now.

Thanks!

[HogMike]

Sounds like a good deal!
May do a leak down test on the heads and if you have the new stuff when you get your barrels off check rod play, if that's ok put on your new stuff and you'll be fine for another 90k miles!

 

[DTTJGlide]

Just making sure, is your bike a 114 or 117 with a 4.5 crank already? A lot of people think they can do that set-up on their 107. I did a similar replacement on my 17 RG 107 last Spring at 152K, I just used 117 cylinders with 114 stg3 4.075 bore pistons. The bottom end checked out OK, I also got takeoff heads, but didn't get the rockers, the bronze bushings were badly worn, my indy just replaced the bushings since he's also a machinist. We also replaced cam & lifters, so I'm not sure what your cam chest service included, just look stuff over replace whatever looks marginal so you don't have to go back in later. It sure made for a low cost overhaul!

[scott7d]

Thanks. I'll inquire about that as well. The bike actually has 195,000 with the stock top/lower end. Only the cam chest and a few basic things have been checked and replaced along the way. The most invasive being a new stator at 170,000.

[scott7d]

The bike is already a 117 so it's like for like parts. With almost 200,000 miles, it's probably been on borrowed time for a while. Ready to get ol' girl freshened up.

[DTTJGlide]

The bike is already a 117 so it's like for like parts. With almost 200,000 miles, it's probably been on borrowed time for a while. Ready to get ol' girl freshened up.

I wasn't sure about that so just wanted to put that out there, the bottom-end seems to be pretty stout on the M8s if they haven't been abused. I'm hoping to get 250K plus, at 173,500 now, at almost 72 it'll be my last touring bike, I don't care for all of the tech on the new bikes, too much to go wrong & I don't need it to enjoy the ride, stream music & nav from my phone & use maps to pick the roads "I want" to take &  try to stay out of cites as much as possible. Good luck with your project, you should have a good result for a low cost, leaves more $$ FOR FUEL & TIRES!

[r0de_runr]

Wow!

What other work have you done? Belt? Swing Arm? Steering stem? Clutch or Comp?

I've got a 2020 CVO Limited.

I put 45k miles on my 14 limited and about 46k on my 19 limited.

[scott7d]

- Stator at 170k
- Cam chest service at 150k
- New front compression release at 140k
- Replaced both O2 sensors around the 150k mark. One was throwing a code so just replaced them both.

Around 110,000 a friend went through and replaced some bearings, motor mounts, belt, and clutch. I'm still on just my second clutch and it still has the original compensator. Top end has never been off. My second belt still looks good. Aside from the top end, we'll replace the primary chain tensioner this winter.

[rigidthumper]

Consider a new primary chain-when they do fail, it can take out the clutch basket, I & O primary, trans main shaft, and/or cause crank shift/failure.

[scott7d]

I will get that ordered ASAP. Thank you for the heads-up!