By joining you will help ensure that we can continue to provide this service
JOIN HERE!
Non Vented Final Drive on my ‘55 R50
- CWRoady
- Posts: 91
- Joined: Mon Jun 29, 2020 3:42 pm
- Location: SoCal
- Has thanked: 1 time
- Been thanked: 1 time
Non Vented Final Drive on my ‘55 R50
1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS
-
- Posts: 73
- Joined: Fri Oct 27, 2006 3:00 am
- Has thanked: 1 time
- Been thanked: 8 times
Re: Non Vented Final Drive on my ‘55 R50
The key is to vent as furthest to the top of the final drive as possible. Venting off the fill plug can be problematic if not properly designed.
Also, ensure you're using gear lube in the final drive as opposed to engine oil.
- schrader7032
- Posts: 9052
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
- Has thanked: 3 times
- Been thanked: 36 times
Re: Non Vented Final Drive on my ‘55 R50
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Re: Non Vented Final Drive on my ‘55 R50
The main drive casting looks like it had a flat (slight counterbore) machined into it for this to sit flat.
'57 Lambretta LD150
'70 R60/5
- CWRoady
- Posts: 91
- Joined: Mon Jun 29, 2020 3:42 pm
- Location: SoCal
- Has thanked: 1 time
- Been thanked: 1 time
Re: Non Vented Final Drive on my ‘55 R50
1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS
Re: Non Vented Final Drive on my ‘55 R50
https://www.mcmaster.com/vent-plugs/
You might be able to get a 1/8" NPT thread into the fill plug.
'57 Lambretta LD150
'70 R60/5
- malmac
- Posts: 796
- Joined: Sun Jun 29, 2014 2:10 am
- Location: Toowoomba, Australia.
- Has thanked: 1 time
Re: Non Vented Final Drive on my ‘55 R50
What an interesting post. The photos are good and the idea quite achievable.gray7252 wrote: ↑Sun Mar 07, 2021 4:55 pmI may have what flyingtpot is referring (or it's a custom job). I have a 1956 R69 where the final drive has had a vent added by previous owner. Body of 'vent' is aluminum, and the vent hole is about 1/16" dia. I grabbed a piece of wire and stripped it back about 2.5" and fed it into the hole, and it appears to go all they way straight through.
The main drive casting looks like it had a flat (slight counterbore) machined into it for this to sit flat.
You have me thinking, as I have a non vented final drive that is ready to be rebuilt with all new bearings and seal.
Thanks.
Mal
Toowoomba- Australia
- jwonder
- Posts: 784
- Joined: Wed Nov 23, 2016 7:50 pm
- Location: Long Island, New York
- Has thanked: 3 times
- Been thanked: 8 times
- Contact:
Re: Non Vented Final Drive on my ‘55 R50
I just picked up a R50S with a non-vented Final Drive and I am very interested in how yours turns out! Venting the FD in my mind is the way to go!
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
- Bikesmith01
- Posts: 46
- Joined: Sun Jul 12, 2020 4:55 pm
Re: Non Vented Final Drive on my ‘55 R50
Once I get the bike back up and running I'll follow up to let you know if it works. If not, I still have undrilled plugs
Jon the Bikesmith
1959 BMW R60
1940 Royal Enfield WD-C/O
1942 Chevy 3/4-ton special Flatbed
1985 BMW K100RS
******************************************************************
- CWRoady
- Posts: 91
- Joined: Mon Jun 29, 2020 3:42 pm
- Location: SoCal
- Has thanked: 1 time
- Been thanked: 1 time
Re: Non Vented Final Drive on my ‘55 R50
1955 R50 / 1973 R75/5 / 1974 R90/6 Hack / 2015 RT
Yard Art 1968 +/- Hodaka & SACHS