Engine Knocking??!!!??

sxecafe

sxecafe

You think the Carpet Pissers did this?
Dudes & Dweebs

I noticed today while riding that as I was coming to a stop, there was a decent knocking that seemed like it was coming from the bottom of the crank case. It was a solid 8-10 knocks that successively slowed down as I came to a stop. I have NO idea what would cause this but It clearly cant go un-noticed.

Any thoughts?

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Are you positive it came from the bottom of the crank case? Only reason I ask is you were riding the bike at the time, I assume,--kinda tough to be sure of the location from the saddle. Maybe do the usual tune-up items, tappet adjust, cam chain, etc etc and see if it's still there?
 
I had been riding for a month or so and didnt have this issue until this weekend. However, that was the farthest I had been from home since getting the bike on the road. I had the whole top end apart.

Maybe I have to tighten shit down?


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At this point, who knows. I'd definitely see if you can isolate the location of the noise first.
 
I tried to see if when I stopped and rev'd the engine to see if that made it happen... it doesn't seem like that's what makes it happen. It's when I'm actually rolling and come to a stop, which is harder to isolate, unless I go all "The Shinning" on my shit and hang on to the bottom of the bike while I'm riding.


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Huh. Even more possibilities then. Does it do it with the engine off? Maybe get a little speed then kill the engine.
 
Im not sure. I have to get home from where I'm at (gotta love technology that I can be on DTT right now)...

Maybe when I pull in the driveway I'll kill is and see what happens.


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Sounds like its connected to wheel rotation if it slows down as you slow down and isn't affected by revving the bike.

Check chain, sprockets, brakes and wheels?
 
I know it's not a great picture of the chain but here is what I bought (it was a long time ago).

DSC_0318.jpg


I did a little more detective work on the way home. I could only reproduce the effect when I pulled the clutch in first gear to stop. Speed made no difference. I could recreate it putting through the parking lot as well as stopping from 40 mph. I pulled the clutch and hit the kill switch a few times as well and was NOT able to recreate the effect. Truth be told, it happened much less on the way home than it did on the way to my destination (roughly 15 miles one way). I have no acceleration issues either.

I'll do some checking on the wheels, sprockets etc. Any other ideas?
 
Look for wear marks on your cases, sprocket covers, anything near your chain, it could be that you experienced less noise the further you went because it has worn down whatever it was rubbing against.
 
The reason I asked if it was an o ring 530 chain is because they do hit the transmission case on the cb550, I had the same issue. Pull the cover and check your case. Wear it rubs you can kinda grind a little bit and it clears no problem after that, it hits very little and it also took me a little bit to hear it.
 
That looks an awful lot like chain slap to me... Check the tension, my chain driven bikes only did that while the chain was breaking in or had gotten stretched with age/use. Or were a link or more oversized after a sprocket swap.
 
Both sprockets are new as well as the chain. I had to shorten it when I put it on. Is there a way of calculating the number of links you should have on a chain?
 
http://www.rebelgears.com/chainlengthcalculator.html

Try that.

I usually just "eyeball" it based off the stock chain spec, wheel rammed as far forward as possible in the adjusters, add or subtract length to connect the ends and get the right lower span "sag". Sometimes it is right, other times it bites me in the ass.
 
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