Going back in... Cylinders and pistons time
To the Dyna, set up my work area so that I can hammer this out after my 45 mile morning pedal. The filter is about a half inch in diameter wider and easily double the depth of my current one.
I will say that the cleaner is beautifully machined and smooth.
The billet back plate has a piece that pops out and then the stack slides out (took me a while to figure that one out, I even pm'd misfit!).
Looking at my other breathers, I think I might be able to use them but if not I'll order the ones from HPI.
Did the velocity stack have an O ring for some sort of seat?
How thick is the backing plate?
What does the back side of the inner plate look like.?
Tokillya is good stuff. Had district 38 desert racing meetings that were called that required a shot of patron tequila that came out of the freezer. Meetings were on Friday night so you had a day to recover before the race.

I had a Trek 560 in the mid to late 80's, it was a good quick bike. I even won a Triathalon on it, "team" triathalon. Had a girl on our team, she swam, I rode, and a buddy ran.
As it happened, she had been an Oregon high school "state" champion swimmer
, she crushed everyone, and it was her that enabled us to win 
There were only two coed teams in the competition but hey, a win's a win
Be careful, folks "vehicle drivers" ain't hospitable like they used to be
Come one down, we have a killer bar right next to the pool table. The wife has started to collect Tequila and we don't sip!
Did the velocity stack have an O ring for some sort of seat?
How thick is the backing plate?
What does the back side of the inner plate look like.?
Tokillya is good stuff. Had district 38 desert racing meetings that were called that required a shot of patron tequila that came out of the freezer. Meetings were on Friday night so you had a day to recover before the race.
To answer the questions above:
It's absolutely machined beautifully!
1. No rubber oring of any sort below the velocity stack, it slides into place below a machined lip of sorts and then seems to be held in place by both the cover and of course pressure from the filter and cover once bolted into place. Think I should use some gasket maker? It's very snug as is.
2. Backing plate is of various thicknesses but where it meets the velocity stack is almost half an inch thick, yet incredibly light.
3. I've attached a few pics for you.
Last edited by robbyville; Aug 5, 2017 at 10:39 AM.
The Best of Harley-Davidson for Lifelong Riders
To answer the questions above:
It's absolutely machined beautifully!
1. No rubber oring of any sort below the velocity stack, it slides into place below a machined lip of sorts and then seems to be held in place by both the cover and of course pressure from the filter and cover once bolted into place. Think I should use some gasket maker? It's very snug as is.
2. Backing plate is of various thicknesses but where it meets the velocity stack is almost half an inch thick, yet incredibly light.
3. I've attached a few pics for you.
Snipped pics
As long as the stack fits tight I wouldn't mess with any sealer unless the instructions say so..
Again a very nice design from HPI.. Thanks for the extra pics..
Yep it slides in nicely and snug. Install was super easy of course, 10 minutes in total. Unfortunately the DK breather bolts and spacers were too short so I'll have to order the ones from HPI. I took out the DK set up and will sell it off cheap I guess. This is still a nice narrow profile but much bigger than the DK. I'm curious if it will translate into a few additional HP although will be tough to guage since I've added in the cylinders and pistons above and beyond the AC. Now back to the long drawn out break in process before getting a Dyno appt!
Will also start to look for a nice cover









