Scooterotica

I have the old problem of my breather plug spitting out oil, no seals are shagged , is there a fix for this?

frank

I've seen a few breather bolts machined down to accept a flexible plastic tube with a small air filter on the end.

I'm sure someone was producing them, but would be fairly simple to knock up yourself.

I always use an original breather plug from which I've removed all the crud and the wire wool from the last 40 odd years- this allows any build up of pressure within the case to exit via the plug as intended and not force its way past any seal. There may be a slight "weeping" of oil but this is preferable to a blown seal IMO

Chris

bristolmod wrote:I always use an original breather plug from which I've removed all the crud and the wire wool from the last 40 odd years- this allows any build up of pressure within the case to exit via the plug as intended and not force its way past any seal. There may be a slight "weeping" of oil but this is preferable to a blown seal IMO

Chris

Good advice and seconded by me....

Avantone wrote:I've seen a few breather bolts machined down to accept a flexible plastic tube with a small air filter on the end.

I'm sure someone was producing them, but would be fairly simple to knock up yourself.

Pretty much what i'm thinking.... but running a hose from the breather plug to the air filter, simular deal to a PCV setup on a car.

a while ago i fitted a mbd stainless breather plug, then noticed oil being forced out? put the old one back in and problem solved

red ghost wrote:

Avantone wrote:I've seen a few breather bolts machined down to accept a flexible plastic tube with a small air filter on the end.

I'm sure someone was producing them, but would be fairly simple to knock up yourself.

Pretty much what i'm thinking.... but running a hose from the breather plug to the air filter, simular deal to a PCV setup on a car.

I thought this was only done on a four stroke, somthing to do with crank pressure and Inlet vacume on diffrent parts of 720 degree ( Two revolutions ) four stroke cycle.... I would be very interested to know how this performs if you connect back to the air box. Please dont forget to post back your findings if you go down this route, as any knowledge gained is a good thing....another Idea on this forum that I had never thought of....so for now disregard my last post...

On 4 strokes any unburnt hydrocarbons getting past the piston rings go directly into the crankcase, due to emission laws these were no longer allowed to be vented to air so are fed back into intake system to be re-burnt. On a 2 stroke blow-by does not get into the crankcase unless the drive side seal has gone so PCV would be a waste of time.

J1MS wrote:

red ghost wrote:

Avantone wrote:I've seen a few breather bolts machined down to accept a flexible plastic tube with a small air filter on the end.

I'm sure someone was producing them, but would be fairly simple to knock up yourself.

Pretty much what i'm thinking.... but running a hose from the breather plug to the air filter, simular deal to a PCV setup on a car.

I thought this was only done on a four stroke, somthing to do with crank pressure and Inlet vacume on diffrent parts of 720 degree ( Two revolutions ) four stroke cycle.... I would be very interested to know how this performs if you connect back to the air box. Please dont forget to post back your findings if you go down this route, as any knowledge gained is a good thing....another Idea on this forum that I had never thought of....so for now disregard my last post...

The remote breathers I've seen vent to atmosphere, and were not recycled. Though one of the photos on the 100 MPH Lambretta Club site show a breather tube disappearing into the main frame tube, with what maybe an integral filter?

here's mine :

I just cut the top off an old breather, welded a bit of tube on and fitted that boy racer filter which cost about £3 from ebay. seems to work, and doesn't leak, unlike the stainless one i was using previously