M8 problems
Road Warrior
Joined: Jul 2015
Posts: 1,512
Likes: 345
From: Ohio
on the M8 its p/n 18400073
Just me but I've never seen the HD compression release valve go bad on a twin cam - I've heard about it once or twice but never run into it myself. I have had problems with the HD battery going bad when it gets colder. Ive seen a couple go bad in the cold even if they've been garaged and on a tender every single night... just bad luck of the draw I guess.
Last edited by rjjj629; Oct 31, 2017 at 03:04 PM.
At a M8 workshop l attended at a harley dealer Saturday one of the techs mentioned that MOCO had upped the cold cranking amps on there batteries. They also said the engines were designed to turn over twice before starting in order for the lifters to be pumped up.
Ultimate HDF Member
Joined: Jul 2014
Posts: 5,649
Likes: 430
From: MASS_hole
Guessin I should have stated that an ACR valve can be installed. PITA and expensive less you’re a DIY’er
Now on the cold weather amperage bump on the m8 batteries, didn’t know a out that.
Now on the cold weather amperage bump on the m8 batteries, didn’t know a out that.
Road Warrior
Joined: Jul 2015
Posts: 1,512
Likes: 345
From: Ohio
I'm thinking its standard on the M8s - at least my parts manual says its common to all the 2017 tourers.
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,003
From: Charleston, SC
ACRs have been standard since the introduction of the TC103 as an option (in 2011).
The TC103 which became standard in 2012, the HO103 (2014), and M8 (2017) also have them standard.
OP's problem sounds like a weak battery. Normally shows up in cold conditions.
Last edited by lp; Oct 31, 2017 at 04:37 PM.
Seasoned HDF Member
Joined: Apr 2015
Posts: 6,863
Likes: 3,727
From: St. Charles, MO
You're not wrong...
ACRs have been standard since the introduction of the TC103 as an option (in 2011).
The TC103 which became standard in 2012, the HO103 (2014), and M8 (2017) also have them standard.
OP's problem sounds like a weak battery. Normally shows up in cold conditions.
ACRs have been standard since the introduction of the TC103 as an option (in 2011).
The TC103 which became standard in 2012, the HO103 (2014), and M8 (2017) also have them standard.
OP's problem sounds like a weak battery. Normally shows up in cold conditions.
Ultimate HDF Member
Joined: Jul 2014
Posts: 5,649
Likes: 430
From: MASS_hole
Wish I’da known bout the ACR’s bein optional in 2014. Didn’t do my homework, so my fault.
My bike will occasionally lock up during starts. And than bags hard pryor to ignition. Scary
My bike will occasionally lock up during starts. And than bags hard pryor to ignition. Scary
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,003
From: Charleston, SC
Good catch. Yep forgot those. First year for the "Limited" and the TC103. Back when the Limited was more... well unique and more like a CVO Jr.
Basically, for the standard/limited bikes, ACRs were introduced with the TC103.
CVO's had them since 2007 with the introduction of the 110 but not in the CVO103 in years past - probably because of the shorter stroke.
Basically, for the standard/limited bikes, ACRs were introduced with the TC103.
CVO's had them since 2007 with the introduction of the 110 but not in the CVO103 in years past - probably because of the shorter stroke.
Last edited by lp; Oct 31, 2017 at 10:02 PM.
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Seasoned HDF Member
Joined: Dec 2005
Posts: 19,925
Likes: 8,027
From: poway
Good catch. Yep forgot those. First year for the "Limited" and the TC103. Back when the Limited was more... well unique and more like a CVO Jr.
Basically, for the standard/limited bikes, ACRs were introduced with the TC103.
CVO's had them since 2007 with the introduction of the 110 but not in the CVO103 in years past - probably because of the shorter stroke.
Basically, for the standard/limited bikes, ACRs were introduced with the TC103.
CVO's had them since 2007 with the introduction of the 110 but not in the CVO103 in years past - probably because of the shorter stroke.
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,003
From: Charleston, SC
In 07 they basically put a variation of the CVO103 crank into the TC96.
I'm not sure what cam came with the CVO103, it was small ended though (small bearing).