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Old 02-23-2011, 04:50 PM   #1
GPzPop OP
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burping my airhead

Hi Inmates all,

On my beloved 1983 R100RS, after the ride, when I shut down, I can toggle the run/stop switch on the right bar, and the cdi will discharge the coils to the spark plug, which ignites the remaining mixture and will softly backfire thru the carbs or pipe, depending on which valve may be open upon the ceasing of motor.

I usually can get one side to "burp", and sometimes I can get both cylinders to "burp"

Anyone else do this? any downside?

--S
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Old 02-23-2011, 05:11 PM   #2
DaveBall
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Any type of backfiring is not good for the engine.
Stop feeding it mexican fuel and it may go away.
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Old 02-23-2011, 05:21 PM   #3
Mendodave
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k-Blam!

Quote:
Originally Posted by DaveBall View Post
Any type of backfiring is not good for the engine.
Stop feeding it mexican fuel and it may go away.
I hit the kill switch once on the R80G/S while riding with buddies, flipped it back on and blew a 3' flame out the back, K-BLAM!

quite impressive.

I did it on purpose once while passing some road impediment, he was not happy.

No, it isn't good for the engine.

Mendo
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Old 02-23-2011, 05:38 PM   #4
fishkens
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Quote:
Originally Posted by GPzPop View Post
I usually can get one side to "burp", and sometimes I can get both cylinders to "burp"

Anyone else do this? any downside?

--S
Burp, eh? This happens occasionally on my 88 GS but I never knew what it was and I hadn't correlated it with the kill switch (I usually don't use it). It's more like a gentle "poof". I don't do it intentionally and I don't know if there's upside or downside to it.

It's not something I'd do intentionally unless someone here says that it'll extend the life of the flux capacitor.
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Old 02-23-2011, 06:00 PM   #5
The Raven
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Quote:
Originally Posted by fishkens View Post
Burp, eh? This happens occasionally on my 88 GS but I never knew what it was and I hadn't correlated it with the kill switch (I usually don't use it). It's more like a gentle "poof". I don't do it intentionally and I don't know if there's upside or downside to it.

It's not something I'd do intentionally unless someone here says that it'll extend the life of the flux capacitor.
No, but it will keep the dragons fed and happy so they don't eat your beancan sensor

I once came up with a story that I had dragons living in my bean can, they sent a poof of spark up to the coil where bigger dragons lived. Those dragons when receiving the signal would then throw a massive poof to the cylinders and make the the bike go. If you didn't keep the dragons happy, bad things happen to the bike

That's my story and I stick to it.
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Old 02-23-2011, 06:53 PM   #6
DaveBall
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fishkens, Is that policitally correct saying that your bike "poofs"? Don't the Brits have another meaning for that.

The Raven, I like your story. In reality, it makes perfect sense. So therefore should not be shared with the inmates here. They will start arguing about it and each one will have to describe exactly what kind, style and colour of dragons are involved. then they will get into the care and feeding of such dragons. Might even start a couple of new threads all about dragons they have known and nutured over the years.
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Old 02-23-2011, 08:36 PM   #7
fishkens
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Originally Posted by DaveBall View Post
fishkens, Is that policitally correct saying that your bike "poofs"? Don't the Brits have another meaning for that.
Don't worry, I've got a US spec bike.
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Old 02-23-2011, 08:50 PM   #8
fishkens
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Quote:
Originally Posted by DaveBall View Post
The Raven, I like your story. In reality, it makes perfect sense. So therefore should not be shared with the inmates here. They will start arguing about it and each one will have to describe exactly what kind, style and colour of dragons are involved. then they will get into the care and feeding of such dragons. Might even start a couple of new threads all about dragons they have known and nutured over the years.
ADVDragon Rider: Old's Cool

My dragon prefers synthetic maidens

No! My dragon prefers dino maidens.

Well, my dragon prefers to have its breather routed back into its intake.

No! my dragon prefers its breather routed into a catch tank made of the skins of Royal Knights.

My dragon has the perfect colors and stripping as intended by the Creator of all Dragons.

No! Your dragon's colors are all wrong. Cant you see that its scales are not proportional? The Creator would never approve.

My dragon wouldn't start this morning.

It's the battery. Always the battery.

No! It's the rotor.

No! It's the bean can.

Bean can! My dragon eats bean cans for breakfast and has run flawlessly for three millenia on its original, never touched points.

It's the battery!

I'm a member of DOA.

DOA is for idjits! I'm a member of DBC!


















Nah, that'd never happen. We're too sophisticated for that.
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Old 02-23-2011, 10:43 PM   #9
Tosh Togo
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Quote:
Originally Posted by DaveBall View Post
Any type of backfiring is not good for the engine.
Explain why, puhleeze...
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Old 02-24-2011, 06:25 AM   #10
lkchris
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Mostly it's not good for the muffler, which is where the combustion occurs.

But, why are you toggling your kill switch? MSF is 200% wrong in their advice that that's how you stop your motor every time. Your ignition switch is heavy duty and designed for constant use; the kill switch isn't and you'll soon end up with it broken by using it all the time.
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Old 02-24-2011, 06:32 AM   #11
Bill Harris
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I noticed that, too, after I added a Dyna Points Booster to my /5. If I turn the ignition switch "ON" within a few minutes of shutting the engine down, sometimes I'll get a soft "poot" (can we say that here?) when I turn the ignition to "OFF" and the Booster fires a plug in a "live" cylinder.
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Old 02-24-2011, 06:39 AM   #12
LasseNC
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Location: Denmark, Danimarka, Danmark, Dänemark
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Quote:
Originally Posted by GPzPop View Post
Hi Inmates all,

On my beloved 1983 R100RS, after the ride, when I shut down, I can toggle the run/stop switch on the right bar, and the cdi will discharge the coils to the spark plug, which ignites the remaining mixture and will softly backfire thru the carbs or pipe, depending on which valve may be open upon the ceasing of motor.

I usually can get one side to "burp", and sometimes I can get both cylinders to "burp"

Anyone else do this? any downside?

--S
Installed new performance coils on my XS650. It will do the same, up till several minutes after I shut it down.
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Old 02-24-2011, 09:49 AM   #13
Tosh Togo
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Quote:
Originally Posted by lkchris View Post
Mostly it's not good for the muffler, which is where the combustion occurs.

But, why are you toggling your kill switch? MSF is 200% wrong in their advice that that's how you stop your motor every time. Your ignition switch is heavy duty and designed for constant use; the kill switch isn't and you'll soon end up with it broken by using it all the time.

Ok then...it's amazing how "engine" morphs into "muffler" when old-wives tales are challenged.

I've been doing it, on purpose, with a 30 year-old bike whenever the opportunuty presents itself, ie: downhill at ~60 mph in 5th, turn off w/kill switch, count to 5...then switch it back on and BOOM!.

This misbehavior has been going on for a long time, and when the exhaust system has been off there have been no indications of unhappiness inside either muffler body. The bike's still quiet, until a booming opportunity arrives.

It's also effective for getting the attention of tailgaters.
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Old 02-24-2011, 10:28 AM   #14
fishkens
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Quote:
Originally Posted by Tosh Togo View Post
It's also effective for getting the attention of tailgaters.
Oy. I'd hate to get the attention of tailgaters by turning my engine off...and slowing down...right in front of a tailgater.
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Old 02-25-2011, 07:49 AM   #15
bpeckm
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Quote:
Originally Posted by The Raven View Post
No, but it will keep the dragons fed and happy so they don't eat your beancan sensor

I once came up with a story that I had dragons living in my bean can, they sent a poof of spark up to the coil where bigger dragons lived. Those dragons when receiving the signal would then throw a massive poof to the cylinders and make the the bike go. If you didn't keep the dragons happy, bad things happen to the bike

That's my story and I stick to it.


.....you still in cahoots w/ Datchew?






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