for the same freaking reason. the hd website is for 'aftermarket' parts and accessories. not for oem parts. for oem parts, you look them up on the different microfiches for your stock numbers. for chrome bits, the p&a catalog or website. it isn't rocket science (heatwave)

 

he just likes to flap his gums and make himself even less credible and more full of **** if that’s even possible.

 

Agree 100%. The transfer problem was because the engine was sucking on the primary. Now with a vent it's magically pushing into the primary? I don't buy it....

 

Sounds like a used car salesman.

 

The vent fix sure as heck worked on my 2019 CVO Limited.
At about 5,000 miles found out the bike was transferring, and took it to my dealer who installed the vent under warranty the next day. 3 days later I left on a 2 week 4,800 mile trip. half of the time the high temps were over 100, 3 days over 105! (that sucked!) Cranking a constant 85 plus down I-70 to get to the Pikes Peak 5 in 1 ride.
No transferring to date (14,500 miles), yeah, I'd say it worked.....

 

Hey skratch, whose microfiche are you using here. The only one I know of is Ronnie's since Outpost Alaska shut down. I would sure like to have access to another.

The thing is the primary always was vented. It was just through the transmission by way of the clutch rod passage, so if the crankcase was creating excess pressure in the primary it would have vented out the transmission vent and oil from the engine may have entered the primary. There have been very few if any confirmed cases of this. The ones that do exist were caused by a defective engine seal that needed to be replaced. When I devised "The Fix" it was necessary to vent the primary because I was sealing off the transmission from the primary so that nothing, even gasses, passed between them. I did this by drilling a small hole in the clutch actuator.

There is most assuredly a pressure build up in the primary as the oil and materials heat up. This was previously relieved by the transmission vent. Had it not been relieved the primary would eventually start to seep oil past the primary cover gasket. It obviously sometimes also develops a vacuum. This could be in some cases because of the engine seal not being able to sufficiently hold against the vacuum created in the crankcase. When this happens with the way the inner side cover was designed, where oil would pool in the actuator cavity, then the oil would be sucked through the clutch rod passage into the primary. Relieving the inner side cover so that the oil would drain back into the transmission seemed to prevent this. The primary is also going to create a vacuum as it cools. The little bit of oil that transferred in this case would have been negligible. These are the owners that are reporting 1-2 oz. of transfer in 5000 miles. So Harley giving the primary it own vent is really a good thing IMHO.

So as I see it, the guy pushing a separate crankcase vent is selling it to prevent a none existent problem as far as the primary is concerned. The crankcase is already vented through the breathers in the rocker boxes, although there have been cases of these not working well and they do in some cases puke oil into the air cleaner / throttle body. Could a crankcase vent serve a purpose? Possibly, if it was designed correctly, but not the one he is alluding to.

 

https://shop.suburbanharley.com/oem-parts Another parts fiche

 

Not sure why, but I was convinced my September ‘16 build was going to be a problem child. So much so that I had planned on installing one of Stonecold’s kits.

At 950 miles my trans. was down about 4 oz; and the primary was over filled. I have serviced it myself since day one. Engine oil change at 950 (with a camshaft, slip ons, and tuner), 2700, 5000, and 7500. Primary and trans. at 950 and 5000. Only has 8000 on it but if it has pushed 1 oz. out of the trans. in the last 3000 that is about the extent of it. Still well in the X on the stick. And I turn this thing 6000 RPM virtually every time I ride it.

I am assuming at this time that A) the primary was overfilled from the factory, and the trans. was a bit shy, or B) it stopped. Certainly not complaining.

 

Appreciate your posts and insight on this! I wish more would read, and understand this. The several threads are rampant with misinfo, opinions, and straight up BS.

 

Thanks dawg