Exhaust Bung – OLD Bull Trailriders

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February 12, 2012 at 11:28 am #101033

Matt Baker
Member

Why do people have the exhaust bung in when towing their bike to and from a ride?

Some even go to the extent of taping up the exhaust???

I have a bung that I use when washing the bike then I take it out and start the bike to make sure any water that might have got in is blown or burned out.

How much water from rain can get in whilst on the trailer? Not enough to worry about it I reckon….

February 12, 2012 at 11:50 am #216033

Nick Jackson
Member

I use a bung all the time because of the bloody mud wasps up here love building nests in your pipe !!

February 12, 2012 at 11:56 am #216036

Mick D
Member

I have heard that leaving the bung in the pipe during storage isn’t such a good idea as it will trap any water and or condensation in the pipe. Dunno whether that is an issue or not. I dont keep them in my bikes during storage as a rule.

February 12, 2012 at 11:59 am #216037

Matt Baker
Member

Nickj wrote:

I use a bung all the time because of the bloody mud wasps up here love building nests in your pipe !!

Good point, I had a generater with a wasp nest in the exhaust, took ages to figure out why it wouldn’t start.

February 12, 2012 at 12:23 pm #216038

Greg
Member

Yeah Mick you should run the engine and bung the exhaust when hot. It is also to help prevent damp air / moisture in the air from entering through the exhaust valves if they are open allowing surface rust to settle on the valve seats and in the cylinder bore

I also always make sure my engine in on TDC so all the valve are shut

TB

February 12, 2012 at 1:20 pm #216039

glenn
Member

I do it cause it Looks cool.. doesn’t it help keep dust out when you travelling on dirt roads?

February 12, 2012 at 1:46 pm #216040

Matt Baker
Member

Boony wrote:

I do it cause it Looks cool.. doesn’t it help keep dust out when you travelling on dirt roads?

As soon as you start it up any tiny amount of dust would blow straight out.

February 12, 2012 at 2:26 pm #216041

Dean
Member

something to do with negative ionisation :unsure:

I dunno, I got nuthin :laugh:

I agree those wasps are a pain,happened on my old Husky 430 , Was running sweet as a Peach when I parked it. 3 months later wouldnt start,when it did it wouldnt rev , blamed my younger brother for muckin around with stuff he shouldnt :laugh: I was mightly embarrassed when I found out what it was :blush: , Sorry Shano

Ollie

February 12, 2012 at 3:19 pm #216042

Geoff Forshaw
Member

Yes I would mhave to agree with TB. Although there is another good reason to run an exhaust bung, especially if you have say 3 bikes on one trailer and one is put on backwards so bars don’t clash etc. All the air, water dust etc when travelling will enter your pipe (on the one facing backwards) and if you exh valves are open this crap has the potential to enter your engine, with the possibility of causing damage. :huh: :ohmy:

Cheers,
Lefty

February 12, 2012 at 9:25 pm #216034

Roy
Member

When I first got back into bikes I asked the same question and was told it was to stop dust getting in during travel. So I thought about it for a while and said “so it has to work its way up the exhaust and into the cylinder if the piston happens to be down and into the valves if they happen to be open”. I’ve never believed it could be an issue and never bought one. Maybe there is some potential if a bike is backwards on the trailer like Lefty said. I do have a bung now but it is only for washing and I take it out as soon as I’m finished (well nearly every time). I must admit though that the main reason I take it out straight away is that otherwise I will forget and it is embarressing when someone has to tell you why your bike is not starting.

February 12, 2012 at 10:17 pm #216060

Adrian Snowden
Member

I pack one when we do a three day ride as I find them the only effective way of shutting Boony up

February 12, 2012 at 11:01 pm #216063

glenn
Member

snowy09 wrote:

I pack one when we do a three day ride as I find them the only effective way of shutting Boony up

Ha,Ha,,,

If didnt talk to you,,you would be a very lonely man!!!! 😆

February 13, 2012 at 9:49 pm #216044

Jason Anderson
Member

Lefty wrote:

Yes I would mhave to agree with TB. Although there is another good reason to run an exhaust bung, especially if you have say 3 bikes on one trailer and one is put on backwards so bars don’t clash etc. All the air, water dust etc when travelling will enter your pipe (on the one facing backwards) and if you exh valves are open this crap has the potential to enter your engine, with the possibility of causing damage. :huh: :ohmy:

Cheers,
Lefty

+1
The only time the bung is out of my pipe,is when its running.
I have nearly 15,000 DIRT ONLY KM on my bike and havnt had any dramas with the motor at all.

…spud…

February 13, 2012 at 10:05 pm #216045

Bill
Member

Lefty wrote:

Yes I would mhave to agree with TB. Although there is another good reason to run an exhaust bung, especially if you have say 3 bikes on one trailer and one is put on backwards so bars don’t clash etc. All the air, water dust etc when travelling will enter your pipe (on the one facing backwards) and if you exh valves are open this crap has the potential to enter your engine, with the possibility of causing damage. :huh: :ohmy:

Cheers,
Lefty

Maybe if your inlet valves were open and the air filter out and cover off

better off making sure the bike is in neutral on the trailer so you dont get the ring bore damage from the bike rocking on long trips

February 13, 2012 at 10:27 pm #216035

Bob Dowsett
Member

My bike got a wash at Bellingen :laugh:

If your having valve issues buy a WR :laugh:

Boony has got one for his Goat not his bike :ohmy:

You would think it would be feasible to stop all of the above, dust ,water ,rain .hot air , cold air ,wasps ,mice , also would inhibit people from throwing bottletops in there as this then becomes a oh&s issue as they fire out at a rather fast pace and could hurt someone don’tbthey lc(this bit was just to keep it valid in the tech help section)
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