The following is a cut and paste written by an Australian M8 engined Roadglide owner from HDRCGB forum regarding the M8 oil transfer problem that some bikes develop.........
" You don't need the fat pushrod. Good luck to that guy Greg at Macomb Choppers in Georgia USA who sold a lot of those in the first year of the issue surfacing.
You just need the vent that the factory fitted under warranty, now an official part. It's a simple job you can do yourself, or get it done at the next service.
It's basically a plug of rubber with a hose to atmosphere and it is fitted to the far top right rear corner of inner primary. It is the 100% cure.... that pushrod was a profitable Band-Aid for the Georgia guy.
In the meantime DO NOT PANIC. Enjoy your bike. At worst, you will have to drain primary every 500-600 miles or so until you get the plug vent done, and check/top up the gearbox oil level..
Lower gearbox oil level during this
has never resulted in a report/claim of gear damage far as I know" ( Looks like ukGSer have evidence to the contrary ).
cut and paste continues...... "That would make sense to me.... I ran really low oil in my 1980 FXWG gearbox for a few years owing to laziness in replacing worn mainshaft/bushing/spacer and a stuffed seal when it was my only ride..no harm done at all. (fixed that finally).
On my 2019 RG I had the transfer issue for about 2000 miles, in 2019. Couldn't be arsed taking it in specially to be fixed under warranty.... it's a minor inconvenience. As a Shovelhead owner, I found it as troubling as checking battery voltage. But of course, a lot of people who seemingly do not own a spanner went freakazoid about it all over social media. Yawn.
Originally posted by Robert Gunter View Post
yourself the Greg Williams pushrod from Macomb Choppers (they’re on FB).
Many people have had the vent offered by Harley and very mixed results..... some say even worse!
I'm sorry, I call BS - not on your post Robert but on the ''mixed results'' claim and the reports from ''some'' that it was ''even worse'' ... I am on a Road Glide forum where dozens reported having had the fix done at dealerships and every last one said it was the cure. And I back that from PERSONAL experience. I watched all the feedback like a hawk.
When the factory vent kit arrived at US dealerships I took a scan of the official parts sheet, diagram and fitting instructions posted on the RG forum by one of the first guys to get it done in the US, and took it straight to my warranty dealership. They were very intrigued, they had never seen the info and had no record of the part on the Australian H-D database at that stage. They rang H-D Australia HQ and got confirmation that it was coming Down Under. I was all over it.
The factory fitted the vent to all hydraulic clutch M8s from late 2019 because it worked perfectly under warranty..
Greg Williams won't be selling hardly any of those pushrods now. But good on him for spotting the gap in the market while it existed."
From this it would appear that the primary vent fix seems to do the trick.