SuzukiSavage.com - Shutting down the engine.....Sounds?

T Mack 1 - FSO Serious Thumper Alliance Member Offline sold 2001 LS650 for a 1986 XLH1100 Posts: 2919 Emmaus,Pa Gender:	Re: Shutting down the engine.....Sounds? Reply #15 - 10/04/07 at 03:01:10 Sometimes the exhaust pop (not always) and always the starter winding down noise. Or Maybe I should say the " Starter clutch set" assembly. It free wheels when the bike is running. I figured it was the inertial keeping it moving for a sec when the bike shuts down but what Max says also makes sense.
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youzguyz Serious Thumper Offline Posts: 2538 San Antonio, Texas Gender:	Re: Shutting down the engine.....Sounds? Reply #16 - 10/04/07 at 03:12:55 Reverse of T-Mack. Usually the chuff, (sometimes the POW). On occasion, the starter noise. I knew it was the starter area, just never knew why. Max and T-Mack give plausible explanations.
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Oldfeller2

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Re: Shutting down the engine.....Sounds?
Reply #17 - 10/04/07 at 04:11:02

The idea that our bikes can release compression by rolling the engine off the compression stroke has been debated before -- inconclusively.

I am one of the ones that think it does/can happen and that's why our cam chain tensioner has the little notches on it to keep it from compressing and allowing the chain slop from increasing on a "temporary sudden backwards roll" to the point we can skip timing.

The chuff and the pow is the last charge of gas/air mixture releasing pressure as the bike rolls off compression and an exhaust valve opens. The gas/air charge runs down the exhaust pipe and hits the still red hot baffles in the exhaust pipe and igniting.

chuff POW

If an intake valve happens to be the lucky one this time around the compression goes out the carburetor.

chuff or .... chuff chrrrrrrr (or a "crunch" added occasionally)

Every simple chuff is the motor rolling backwards and is likely accompanied by the churrrr sound of the starter gear running backwards and maybe the short crunchy sound is the cam chain running backwards a bit. Or maybe it the the starter clutch engaging a bit and trying to spin the starter (who knows for sure?).

You should prefer the chuff POWs to the chuff chrrrrs to the chuff "crunch"s -- less wear and tear on your various bits and pieces.

The older your bike gets the freer & looser the motor will be and the more this sort of stuff will happen.

Oldfeller

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youzguyz

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Re: Shutting down the engine.....Sounds?
Reply #18 - 10/04/07 at 04:43:05

This is a non-intentional hijack.
The more I read Oldfeller2's post.. the more I was thinking "So that's why my body makes those noises.. " especially the "The older your bike gets the freer & looser the motor will be and the more this sort of stuff will happen. " part. Yep.. as I get older the more chuffs, POWs and crunchs.
LMAO!!
"Growing older, but not up" Jimmy Buffett

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Most motorcycle problems are caused by the nut between the seat and the handlebars. Make sure yours isn't too tight or too loose.

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PerrydaSavage Serious Thumper Alliance Member Offline Riding "The Rock"! Posts: 3522 Republic of Newfoundland Gender:	Re: Shutting down the engine.....Sounds? Reply #19 - 10/04/07 at 05:53:44 What T-Mack1 describes above sounds like what I was trying to describe ... albiet in a more "non-technical" manner than Mack! ... that's what my Bike does ... sometimes followed by a muted "chuff" from the exhaust!
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firsts40 Senior Member Offline Proud PGR Member Posts: 316 South Mississippi Gender:	Re: Shutting down the engine.....Sounds? Reply #20 - 10/04/07 at 06:05:00 I get the occassional "Klunk" when I turn it off also, not that often though. After reading this, it does sound like something that is all of a sudden put in reverse motion. And of course the little "poof".
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Savage_Greg

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Re: Shutting down the engine.....Sounds?
Reply #21 - 10/04/07 at 06:52:08

FreeSpirit wrote on 12/31/69 at 16:00:10:

So it kinda sounds like the engine just went bad....lol...I can't describe the sound of mine like Jkhulon did,but after reading all the problems here,I am a little paranoid

It's kinda a loud sound? Like it died?

Or a clunk?

I hope that I make a loud sound when I die, but chances are that I'll just poot Tongue

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Savage_Rob

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Re: Shutting down the engine.....Sounds?
Reply #22 - 10/04/07 at 07:06:52

PerrydaSavage wrote on 12/31/69 at 16:00:10:

Mine sometimes makes a slight high(er) pitched "pheewer" type sound (almost a whine, but not quite?) when shutting down ... been doing it since I bought her new in '03, so to me it's normal.

That almost sounds like the reports of meowing at shutdown, which was attributed to the fuel tank trying to equalize pressure. I think it should only apply to those models without a vented gas cap. I think these are usually equipped with the emissions stuff like CA models. I don't know whether Canadian or European bikes have vented caps or not.

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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: Shutting down the engine.....Sounds? Reply #23 - 10/04/07 at 14:01:51 Mine gos Ka Put
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vtail Senior Member Offline life's short, ride fast Posts: 408 Portland,OR Gender:	YeppRe: Shutting down the engine.....Sounds? Reply #24 - 10/04/07 at 15:25:40 Yepp mine too sometimes goes whuff-POW or wuff-wuff. Kind of get a kick out of it when they all duck for cover and I'm just screaming "Faulse alarm, just my bike farting"
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FreeSpirit

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Re: Shutting down the engine.....Sounds?
Reply #25 - 10/04/07 at 23:30:04

I don't know after reading all this if my bike is ok or not Undecided

Hopefully!!

But I seem to notice it more on days that I dont ride,(if I've been busy and havent started it in a day or two),just starting it,letting it run a few minutes and shutting it off.(To make sure it will start since I had the battery problem one time.)

That's when I notice the clunk sound moreso.

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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: Shutting down the engine.....Sounds? Reply #26 - 10/05/07 at 05:46:15 And, of course if you want some more interesting reading on potentially destructive shutdown sounds, search for "backlash" and set the wayback meter for something like "9999".
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FreeSpirit Serious Thumper Offline Joy is my Compass ! Posts: 3823 North Georgia Gender:	Re: Shutting down the engine.....Sounds? Reply #27 - 10/05/07 at 09:21:49 Thanks Rob....didnt have a good idea what to search for on this
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Savage_Greg Serious Thumper Alliance Member Offline Don't go around your ass to reach your elbow... Posts: 7844 SW Washington State Gender:	Re: Shutting down the engine.....Sounds? Reply #28 - 10/05/07 at 10:00:36 I wonder how many potential buyers are lurking and reading all this? Bet they won't buy a Savage now
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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: Shutting down the engine.....Sounds? Reply #29 - 10/05/07 at 10:13:51 Savage_Greg wrote on 12/31/69 at 16:00:10: I wonder how many potential buyers are lurking and reading all this? Bet they won't buy a Savage now Their loss.
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