M8 sump?
Seasoned HDF Member
Joined: May 2015
Posts: 7,702
Likes: 17,167
From: MA
As I recall, it wasnt technically sumping, but rather oil transfer, due to a pressure build up. The addition of the vent hose stopped that, and there have been very few, if any, cases since that fix. The sumping issue, as I recall reading, primarily had to do with when people went to stage II, or III, and it was a part failure that caused it. I am certainly no expert, but that is, essentially, what I recall reading.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,144
Likes: 6,166
From: SE Michigan
As I recall, it wasnt technically sumping, but rather oil transfer, due to a pressure build up. The addition of the vent hose stopped that, and there have been very few, if any, cases since that fix. The sumping issue, as I recall reading, primarily had to do with when people went to stage II, or III, and it was a part failure that caused it. I am certainly no expert, but that is, essentially, what I recall reading.
Road Master
Joined: Jan 2016
Posts: 1,143
Likes: 433
From: Menifee, CA
In my 71 years of using machines and fixing them, I have plenty of times got two or three consecutive parts that were bad out of the box. When I was working as a tech on postal automation machinery, I saw plenty of weird things come out of the parts rooms, things that were hard to explain, odd coincidences that made us scratch heads and wonder at the wonder of it all.
Tourer
Joined: Nov 2009
Posts: 327
Likes: 19
From: Florida
I thought so too, till some "expert" told me a while ago that cam only on a Stage 1 tune was still sage 1. According to him, Stage 2 and above involve displacement, head work, machining, etc. in greater amounts as you go up the stage #. In any case, 1 or 2, I love mine just the way it is!!!
Road Warrior
Joined: Sep 2016
Posts: 1,887
Likes: 1,059
From: SE Washington
I thought so too, till some "expert" told me a while ago that cam only on a Stage 1 tune was still sage 1. According to him, Stage 2 and above involve displacement, head work, machining, etc. in greater amounts as you go up the stage #. In any case, 1 or 2, I love mine just the way it is!!!
Couldn't agree more with the last statement. These M8s are excellent machines.Harley "stage" terminology has been around a long time and has been used by HD as well as many aftermarket companies. The idea is that you can build a little at time with each stage building on the previous. Anyway, just to clarify in my own laymens tems:
Stage 1 = pipes, a/c and tune
Stage 2 = Stage 1 plus cam
Stage 3 = Stage 1 plus cam and displacement
Stage 4 = Stage 3 (basically) plus heads
Last edited by MTBIG G; May 2, 2020 at 03:19 PM.
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