Sludgy Bings

[John Roberts]

There's a lot of dark brown sludge around the atomisers at the bottom of the needle valves on my 40mm Bings. All the other jets and passages were clear, there was nothing suspicious in either the float bowls or the in-line fuel filter, the filter was as clean as new.

I stripped the carbs in an attempt to cure persistent rough running between 1,500 and 2,000 rpm. It made no difference unfortunately.

I use Castrol Valvemaster additive for the sake of the valve seats.

So why is this sludge there, where is it from?

 

[Rob Farmer]

Probably out of the breather tubes that poke into the inlet tubes. I just live with it having tried various removal options in the past. Most of the remedies seem to end up with oil dribbling down the back of the airbox.

As your guides and bores wear the engine will breath harder blowing more crap through the breather. My PD has badly worn valves, guides and bores and throws an awfull lot of gunk down the tubes. On the other hand my bitsa, having a recently rebuilt engine, chucks nothing through the breather.

 

[Redboots]

Doing my bit to help the global warming climate change with a carbon footprint, I vent mine to the atmosphere

John

 

[VAL. H.]

Doing my bit to help the global warming climate change with a carbon footprint, I vent mine to the atmosphere

John

I was just thinking along thses lines too.


Rob, What's wrong with puting the breather tube into a coke can or similar like they do wuth race bikes. Would that make a difference to the running of the bike, as well as keeping the oil out of the carbs?


Val.

 

[Rob Farmer]

Val,

A coke can wouldn't be a problem if you don't mind the look.

I'd sooner address the worn engine though.

Duckhams 20/50 used to be a nightmare for chucking emulsified goo up into the the breather tubes. worn engine or not.

 

[John Roberts]

You sure of that, Rob? I thought Duckham's Q20/50 was clean (sludgewise) whereas Castrol was the villain of the piece being particularly sludgy. All that was back in the '60's, so I won't swear to it.

Anyway, bollocks to that, and my thanks for the explanation re the source of my current carb sludge, I just took the inlet tubing elbow off the carb and can see how it gets into the atomiser-straight through the little pssage from where it drips from the breather. Seems so obvious now you mention it, why didn't I think of that??!

Thanks again.