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General Category >> Rubber Side Down! >> Knock Knock
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Message started by Slowlane on 02/26/21 at 14:38:47

Title: Knock Knock
Post by Slowlane on 02/26/21 at 14:38:47

2009 S40 1288miles. With this few miles is it normal for the engine to make a lot of knocking sounds? I know about the cam chain tensioner but this bike just knocks all the time especially at 0 to 50 mph. It's got an new filter and correct level of Rotella 5-40 T6. Thanks, Slowlane

Title: Re: Knock Knock
Post by Gary_in_NJ on 02/26/21 at 15:14:54

No, the LS650 engine is a quiet running engine. The cam chain tensioner "slaps" when out of spec. The rod knocks when the bearings are worn.

When you say 0 mph, are you talking about when the bike is idling, in neutral? If it only happens when you are moving, perhaps you are lugging the engine (always in the wrong gear). If you hear it with the engine unloaded (in neutral), you may have a problem.

How long has it been knocking? Can you determine if it's coming from one side of the engine or the other? Does it sound like both equally? You can use a wooden dowel against your ear as a stethoscope to try to locate the source.

Other than to diagnose the knocking sound, I suggest you stop running this engine until the cause is identified. It could be nothing...or it could cost you thousands.

Title: Re: Knock Knock
Post by Slowlane on 02/26/21 at 16:15:21

I took it down to my neighbor and let him and his wife listen to it cause my hearing is fubar. He said he heard some tapping/knocking but considered it normal but dosent know anything about Savages. He's a Mustang lover. I'm just gonna ride it and keep the oil clean. Iv'e worked on this thing for months and it's time to ride.
Thanks Gary.

Title: Re: Knock Knock
Post by ckahleer on 02/26/21 at 16:52:44

Next time you fill up, try using premium gas. Probably not the cause, but worth trying

Title: Re: Knock Knock
Post by Matchless G11 on 02/26/21 at 17:16:00

Might want to check your oil.
Enough?
Too much (gassy) !

Something to look at.

I am not a expert in any way, but You might listen near the decompression lever. I heard somewhere if that is out of adjustment .

Anyone else want to comment ?

Title: Re: Knock Knock
Post by justin_o_guy2 on 02/26/21 at 17:53:00

What speed are you changing from first?
Second?
Is it a constant thing or just sometimes?

Title: Re: Knock Knock
Post by Ruttly on 02/26/21 at 19:10:39

It might be gettin ready to chuck the counterbalancer on the road , like that last guy maybe a year ago. He said it was knocking and then not. That’s when his counterbalancer past him up.

Title: Re: Knock Knock
Post by Hiko on 02/26/21 at 19:47:21

Knocking noise is not normal
I think you should investigate what it is trying to tell you
Its not that much work to take the clutch cover off and have a good look in there as a start point Look at the tensioner and the LH nut on the crankshaft gear and every thing else in there that might show some signs of something amiss.
Others may have some other/better ideas

Title: Re: Knock Knock
Post by Dave on 02/27/21 at 03:12:14

Does it knock louder at low engine rpm?

Does it knock louder under engine load and or full throttle?

Title: Re: Knock Knock
Post by Slowlane on 02/27/21 at 06:38:25

The knock is more like a sewing machine knock.

It knocks at all speeds lower than 50mph. Too much wind noise to hear any knock above 50.

I'm using 93 Marine grade non-eth gas.

I will try to get more people to listen to it.

Title: Re: Knock Knock
Post by Dave on 02/27/21 at 07:01:10

If it is more like a sewing machine ticking....it is likely normal.

The headlight bezel and the speedometer are good sources of noise, and it is surprising how much it sounds like it is coming from the engine - especially if you ride with a full helmet.

I though the top end of my engine was beginning to come apart, and there was a lot of noise....especially when I came to a stop at a traffic light. Finally I reached forward and put my hand on the top of the headlight, and I discovered my headlight was making all the racket. I took the bezel off and installed some foam tape to take up the slack and things got a lot quieter.

You can do a search for the cure for the speedometer rattle.

Title: Re: Knock Knock
Post by Gary_in_NJ on 02/27/21 at 08:27:34

Agreed Dave, that’s why I suggested in my first reply to locate the source. Suggestions from others to take things apart is nonsense. Don’t go down a rabbit hole, do the simple things first - identify from where the noise emanates.

Title: Re: Knock Knock
Post by ohiomoto on 02/27/21 at 09:19:49

In my book, an engine knock isn't a knock until it's bad enough to know for sure that it's a knock and you're only screwed if it's actually a knock.

It's served me well over the years...knock on wood.

Title: Re: Knock Knock
Post by justin_o_guy2 on 02/27/21 at 10:03:15

You know these are noisy engines, right?
If it's not ticking, it's dying.
Sewing machine is the way we describe it .

If someone who has ten thousand miles on a savage says it's got a problem, you should listen.
Anyone else, you might be ahead to ignore.

Title: Re: Knock Knock
Post by Ruttly on 02/27/21 at 10:07:07

The important question is , Is there rough running and/or any vibration , hesitation in conjunction with the knocking ? Cold or hot , uphill , downhill , accelerating , decelerating , all are key in locating/troubleshooting the knocking sound. Gotta find it before it leaves you walking/pushing !

Title: Re: Knock Knock
Post by Slowlane on 02/28/21 at 18:50:52

Got two sets of good ears that know what to listen for to hear it run today and they said it was fine. So.....it's snot nokkin.