SuzukiSavage.com - lugging sound...knock...what is it?

mojohand40

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lugging sound...knock...what is it?
07/26/12 at 18:48:07

At idle and at revving in neutral (or with the clutch in) my engine ('98 with 13k) sounds pretty good. Like a "angry sewing machine" as some have said. But, if I lug a little, like say have it in 3rd when it should be in second...or have it in second when it should be in first...I get a pretty loud rapping sound. Kind of reminds me of the sound of the decompression solenoid at start up.
Like a knock-knock-knock until the engine revs up.

Now I know the answer is to not lug the bike....but what is hitting what when that happens? What makes that sound? Loose front pulley? is it normal and I'm just not used to a thumper?
thanks!

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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 29195 Tucson Az Gender:	Re: lugging sound...knock...what is it? Reply #1 - 07/26/12 at 19:18:19 It's the piston banging it's head against the cylinder in frustration because you refuse to downshift, even though you know you should... ...
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: lugging sound...knock...what is it? Reply #2 - 07/26/12 at 19:38:16 I went to see my Doctor,, every time I leaned over a certain way & lifted anything over 30 pounds,, it hurt,, You know,, I Hadda PAY that guy & all he did was review my complaint & make sure he understood, then he said Dont Do That...
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Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12686 Fayetteville, NC Gender:	Re: lugging sound...knock...what is it? Reply #3 - 07/26/12 at 21:48:16 Tighten all your motor mounting bolts (3 sets of them) and stop doing that lugging nonsense. You gonna rupture your crods if you keep on lugging at them.
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Boofer Serious Thumper Offline Nearly too old. Posts: 1760 N Ms Gender:	Re: lugging sound...knock...what is it? Reply #4 - 07/27/12 at 15:54:59 imo lugging is worse than over revving. Push down on the shift thing.
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ralfyguy Serious Thumper Offline Posts: 932	Re: lugging sound...knock...what is it? Reply #5 - 07/27/12 at 16:59:54 From my experience the motor doesn't like it much below 2,500 rpm. At least not for accelerating hard. Just keeping the speed is fine, but I try to keep it above that. A multi cylinder motor is not as picky, but that big piston doesn't like it to be thrown around at low rpm.
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 29195 Tucson Az Gender:	Re: lugging sound...knock...what is it? Reply #6 - 07/27/12 at 17:01:28 Correct me if I'm wrong,... but... I believe that sound is not anything physical,.. but it's still very bad... It's the sound of pre-ignition... The fuel is going boom while the piston is still traveling upward... .. so the boom hit's it like a hammer... Knock, knock... Who dare?... ...
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: lugging sound...knock...what is it? Reply #7 - 07/27/12 at 23:09:31 Yea, & I dont Dare do that,, I hate that sound. Till mine was broken in, It did that if I launched w/o keeping the RPM up pretty high,
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Digger

Serious Thumper
2005 No Login

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Ya gotta be tough to
ride singles!

Posts: 1604
Colorado Springs, CO
Gender: male

Re: lugging sound...knock...what is it?
Reply #8 - 08/04/12 at 22:09:11

mojohand40 wrote on 07/26/12 at 18:48:07:

.....What makes that sound?....

It's the sound of your motor telling you to stop doing that!

All kinetically complex machines have languages. It's on us to try and understand them.

It's when we can't understand the languages (or disregard their content) that we run into problems. As in the Space Shuttle (may she RIP) killing 14 fine human beings. The Shuttle always broadcast well in advance what her problems were.....but sometimes, we could not understand her cries..... Sad

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Digger
2001, Metallic Glacial Blue, Raptor Petcock, Verslavy (first hole) (otherwise, mechanically, the bike is stock), 13,xxx miles
I don't own a cage.
www.astronautbiker.com

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Serowbot

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OK.... so what's the
speed of dark?

Posts: 29195
Tucson Az
Gender: male

Re: lugging sound...knock...what is it?
Reply #9 - 08/05/12 at 01:31:08

Digger's pullin' the astronaut card... Huh

...
That's so COOL!... Grin

...
We Savager's have an astronaut in our family... Man, that's cool!...
No matter how fast you've ever gone,... Digger has gone faster...
That's amazing to me...
What is it, Digger?... something like 25,000mph?... More?...
(I wish I coulda' done that... not really, I don't even like the roller-coaster..)... Undecided

...

Is a thumper really that torquey after all that?... Undecided

...

.. but,.. Yunno'.......
I've watched most of those shuttle launches...
... and I think we could take it,.. 0 to 60...

Okay,.. maybe not straight up... Tongue

...

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Ludicrous Speed !... ... Huh

...

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Digger

Serious Thumper
2005 No Login

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Ya gotta be tough to
ride singles!

Posts: 1604
Colorado Springs, CO
Gender: male

Re: lugging sound...knock...what is it?
Reply #10 - 08/07/12 at 21:56:43

Serowbot wrote on 08/05/12 at 01:31:08:

....What is it, Digger?... something like 25,000mph?... More?......

Nope, only the Apollo guys got going that fast. We topped out at about 17,800 mph on STS-109.

Still, 17.8 is faster than most Shuttle missions got....we needed the velocity since we were going to the Hubble Space Telescope (350 miles high, as opposed to the low 200's where the Space Station lives).

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Digger
2001, Metallic Glacial Blue, Raptor Petcock, Verslavy (first hole) (otherwise, mechanically, the bike is stock), 13,xxx miles
I don't own a cage.
www.astronautbiker.com

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Borracho Full Member Offline SuzukiSavage.com Rocks! Posts: 132 Albuquerque, NM Gender:	Re: lugging sound...knock...what is it? Reply #11 - 08/07/12 at 22:35:48 Hey, what is the best kind of oil to put in a spaceship? Synthetic or Rotella? Did you ever put Seafoam in the tank?
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 29195 Tucson Az Gender:	Re: lugging sound...knock...what is it? Reply #12 - 08/07/12 at 23:10:03 Borracho wrote on 08/07/12 at 22:35:48: Hey, what is the best kind of oil to put in a spaceship? Synthetic or Rotella? Did you ever put Seafoam in the tank? Seafoam?... of course they did... .. and a rabbit foot,..a chickin' foot, and a bible... 17,000 mph is not the time to take any chances... ...
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thumperclone Serious Thumper Alliance Member Offline PGR rider riding with respect Posts: 6720 Grand Junction Colorado Gender:	Re: lugging sound...knock...what is it? Reply #13 - 08/07/12 at 23:20:20 suck, compress,fire, blow four stroke single get in tune with her
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