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General Category >> Rubber Side Down! >> LS650 Extreme knocking out of engine
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Message started by FIFTI on 06/11/18 at 11:35:17

Title: LS650 Extreme knocking out of engine
Post by FIFTI on 06/11/18 at 11:35:17

My LS650 recently started knocking out of engine. Last day when i started the engine, that knocking turned out to be extreme. As louder as to be unbearable. Seems like something has broken down within its chamber. Support needed plz. I can also send video, if needed fpr exact diagnosis. Thanks

Title: Re: LS650 Extreme knocking out of engine
Post by justin_o_guy2 on 06/11/18 at 11:59:54

Year
Mileage
Last maintenance, what has been done.
Time since work done till problem started.
Can't guess without a few clues

Title: Re: LS650 Extreme knocking out of engine
Post by jcstokes on 06/11/18 at 12:14:46

Post the video and as JOG suggests give as much info as you can.

Title: Re: LS650 Extreme knocking out of engine
Post by stewmills on 06/11/18 at 12:24:23

I am not certain if I would suggest running and idling and getting video considering the severity of the noise?

If it's a cam chain tensioner about to drop out this engine could be one crank away from destruction. If we can assess the mileage and see that it is 10-15K or more (within the "inspect your tensioner" range), wouldn't the safest bet to be to open the case before doing anything?

As noted by the previous posts, can you first advise on the year and mileage and any maintenance and then we can suggest next steps (video or not).

Title: Re: LS650 Extreme knocking out of engine
Post by justin_o_guy2 on 06/11/18 at 13:04:07

They have been known to go from noisy to silent in a second, and remain silent, forever.
Wouldn't crank it.

Title: Re: LS650 Extreme knocking out of engine
Post by batman on 06/12/18 at 16:54:30

If the cam chain tensioner isn't the problem(but you should check this first) and the vibration tends to lesson as engine speed increases it could be a loose flywheel ,we have seen a few cases where the nut backs off .

Title: Re: LS650 Extreme knocking out of engine
Post by kojones on 06/13/18 at 06:15:01

And if it's not loose flywheel or the tensioner it could be balancer shaft hitting the crankshaft due to a missing pin on the crankshaft gear.

https://www.partzilla.com/catalog/suzuki/motorcycle/2001/savage-ls650p/crankshaft

Part #14.

Title: Re: LS650 Extreme knocking out of engine
Post by LANCER on 06/13/18 at 08:09:34

There is another possiblilty and that is the piston.
One of my bikes had sat for an extended period of time without cranking/starting, about 6-9 months. When I did start it I noticed a small knocking sound but was having difficulty isolating where the sound was actually coming from. It still ran, and as the rpm increased it seemed to lessen a bit. When I finally pulled the engine for a look I found the rings has rusted just enough to hold the piston briefly when I did finally start it. At that starting sequence the rusted rings held just long enough to yank the piston sideways and cause a gouge in the piston skirt and that left a little deposit of aluminum on the cylinder wall. I was able to remove that deposit and there was a tiny ding on the cylinder but I was able to just hone the cylinder and install a new piston. It works just fine now and only cost the $$ for the piston.
The reason I did not bore the cylinder is because it was already out to 97mm, so no room to bore more. Yes, fortunate.