Revised V50 gearbox breather |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Online Points: 2402 |
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Posted: 07 Nov 2017 at 14:55 |
As many people are, I was unhappy with the breather on my V50 gearbox which contrives to chuck half the oil over the top of the box. So I came up with this modification.
1. Spun the "top hat" off in the lathe then bored and tapped the remains 5/16" Cycle (not having any metric taps), cut down a 5/16" stud and bored it through 3mm: 2. Secured the bored stud into the body with JB weld to ensure oil tightness: 3. Installed with a new alloy sealing washer: 4. Fitted a breather tube teed into the output from the engine breather box: |
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Online Points: 17641 |
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I did much the same, but just used araldite to fit a tube into the original breather.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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One of my V50`s has the original top hat whereas the other has a large bore breather pipe routed under the bike, however both do not blow oil from the breathers which always appear dry. Question is does anybody know why a lot of these bikes blow oil out of the gearbox and others don`t?
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Motty
Senior Member Joined: 03 Jun 2015 Location: South England Status: Offline Points: 269 |
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I'm not much help but (so far) the V35 has not blown gear oil out of the breather, I don't actually recall it doing so BITD either
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It’s more fun to try to ride a slow bike fast .....
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jeeprat
Falcone Joined: 23 May 2016 Location: Ontario Canada Status: Offline Points: 18 |
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great mod Im definitely doing that . my 1981 V50 accumulates a puddle of oil on the top of the gear box
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jeeprat
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Online Points: 17641 |
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Might just be down to the actual oil level in the box, IIRC the original V50 required 1 litre of oil, I think it was reduced later.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Online Points: 2402 |
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I've heard that too, and prefer to have the full litre so one reason for the mod.
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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ruf
Falcone Joined: 14 Jul 2017 Location: durham uk Status: Offline Points: 83 |
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excuse my ignorance here... looking at my v50 there is some fluid in the recess on top of the casing under the carbs, i assumed this was small amount of fuel. mixed with dirt/oil/wd40, never more than a thin layer. this `top hat` thing , is there actually a hole somewhere on it to breathe out of ? i can`t see one but the bike still has all it`s clothes on so it`s possible i just am not close enough to see,
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g3ls/gn250/v35
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Online Points: 17641 |
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The "hole" is round the base of that top hat.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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ruf
Falcone Joined: 14 Jul 2017 Location: durham uk Status: Offline Points: 83 |
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ok thanks, definite oil puddle like everyone else , haven`t got a lathe so will have to keep mopping it up !
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g3ls/gn250/v35
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cyclobutch
Senior Member Joined: 08 Sep 2015 Location: Essex Branch Status: Offline Points: 750 |
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Have a sniff of that oil. Mine routinely dumps oil on there but it is from the engine breather not the gearbox.
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Butch
V50 II - 'The Black Pearl' T3 - 'Blue' Eldo Loop - 'Jug' |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Online Points: 2402 |
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Mine was definitely from the gearbox as it was pink! Now replaced by proper stuff with a hearty squirt of molyslip.
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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I thought this breather had a spring and plunger underneath it
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Online Points: 2402 |
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It does.......
It's the gear selector plunger. |
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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one bike of mine has a large pipe fitted over the sawn off top hat but even running without it fitted there is still no oil spillage. I also have a litre in there but no additive, so it seems like the luck of the draw as to if it leaks or not.
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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