Knocking Noise From Engine

[RaYzerman19]

Hard to say without a sound byte or more info or what your definition of a minute is. Hard to say if it was CCT or the cold start/lean fuel thing (would not "knock" in my definition), or if it was like a con-rod-like knock noise, or if it was a clutch noise. If this bike has been sitting a long time, chances are all the oil has drained off parts or leaked out of con-rod bearings so there isn't the full oil cushion between crankshaft and bearings/piston pins and bearings/pistons in the bores/camshaft and bearing caps, etc. Also, if there's the Yamma recommended 20W40 in the crankcase, upon start-up it's going to take a bit to get all the parts lubed properly so they don't have the hammer noise. In this case, the hard knock should have diminished in a few seconds, but the general noise may continue for a minute until things warm up a bit. I've never heard a hard knock in my bike, but I%2

 

[McRide]

... 8,000 miles

It was having a morning stretch... go ride.

 

[SoCalFJR1300]

The ?? I have is - all the time or just some of the time? Just once?

Just one time last Saturday so far...........I'm riding again maybe early this Saturday morning and going for a ride for sure this coming Sunday.

Never heard the knock before and it wasn't a "rattle" was definately a knocking sound.

 

[SoCalFJR1300]

Hard to say without a sound byte or more info or what your definition of a minute is. Hard to say if it was CCT or the cold start/lean fuel thing (would not "knock" in my definition), or if it was like a con-rod-like knock noise, or if it was a clutch noise. If this bike has been sitting a long time, chances are all the oil has drained off parts or leaked out of con-rod bearings so there isn't the full oil cushion between crankshaft and bearings/piston pins and bearings/pistons in the bores/camshaft and bearing caps, etc. Also, if there's the Yamma recommended 20W40 in the crankcase, upon start-up it's going to take a bit to get all the parts lubed properly as oil pressure builds so they don't have the hammer noise. In this case, the hard knock should have diminished significantly in a few seconds, but the general noise may continue for a minute until things warm up a bit. I've never heard a%2

It was ideling for about a minute fine when I first started it........then I heard the loud knocking.....then it stopped after about 10 or 15 seconds.

It ideled without any noise at initial start-up.

 

[SoCalFJR1300]

If you have an inspection mirror, you can see if your CCT is the blue dot version. If you can make an audio recording, even a video recording with a cell phone, that would help considerably if the problem is repeatable. If not, and you're confident you can make the 45 mile trip up to Chino without damaging the motor, I can help you diagnose. If it stumps us both, I can make a video and post it for the world to see. Sound good?

Thanks Goatboy! Really appreciate the offer but so far the "knock" hasn't returned if it does I may take you up on the offer.

I thought by 2008 all the FJR's had the Blue Dot version of the CCT is that not correct?

 

[SoCalFJR1300]

... 8,000 milesIt was having a morning stretch... go ride.

Thanks for the positive attitude buddy.

I'm hoping something just "stuck" for a few seconds and released...............

 

[mcatrophy]

Still not sure what type of knocking. Was it regular, engine-speed related? Or was it an occasional single knock?

If the former, I've nothing to add. If the latter, it's almost certainly a single misfire that "exercises" the backlash in the transmission (even when stationary), nothing to worry about at all. My '06 sometimes did this, maybe once, maybe three times during one warm-up. My '10 has done it once that I remember.

Talked about before, one such thread here.

 

[Fred W]

Yes, that would be the question that would help to characterize this mystery further. Was the knocking continuous and relatively steadily knocking at the engine rpm rate? Or was it occurring more randomly, like: "clunk, pause, pause,pause, clunk, pause,pause klunk, pause, klunk, etc."

 

[08FJR4ME]

Since I have the inferior GenII model

I can attest to all sorts of sounds since 2008. Yes it ocasionally knocks and even use to rattle at start up. I no longer concern myself with the feejer acoustics comming from my cycle. They come and they go. I now have 58K miles and after it warms up all is good. Its getting to the point where if it blows up it has served me well and I will proceed to purchase another one. I hope you have many more miles of noises as I have and enjoy the ride.

Dave

 

[SoCalFJR1300]

Yes, that would be the question that would help to characterize this mystery further. Was the knocking continuous and relatively steadily knocking at the engine rpm rate? Or was it occurring more randomly, like: "clunk, pause, pause,pause, clunk, pause,pause klunk, pause, klunk, etc."

It was a steady knock, similar to a rod knock sound on a car motor...........

 

[Fred W]

Yes, that would be the question that would help to characterize this mystery further. Was the knocking continuous and relatively steadily knocking at the engine rpm rate? Or was it occurring more randomly, like: "clunk, pause, pause,pause, clunk, pause,pause klunk, pause, klunk, etc."

It was a steady knock, similar to a rod knock sound on a car motor...........

OK, in that case, scratch off my suggestion of lean misfire. That is never steady.

 

[mcatrophy]

...It was a steady knock, similar to a rod knock sound on a car motor...........

Could it have been one cylinder failing to fire, possibly a fouled plug or injector that eventually cleared?

(Not sure what you mean by a "rod knock", I am well familiar with "big end knock", possibly the same thing, different English?)

 

[Fred W]

Yeah, same thing. Knock you get when a connecting rod bearing is bad.

 

[08FJR4ME]

Maybe she needs a good thrashing. Take her out and whip the living snot out of her and show her who's boss.

WOT, good luck,

Dave

 

[ionbeam]

If the noise is a rod bearing I believe it would be a unique failure limited to your bike. And, it wouldn't happen just once and then get better. The test is an oil pressure check, bad rod bearing = low oil pressure. The FJR has an oil level light, not a pressure light so there would be no indication.

The engine balancers don't work in a way that would/could cause that noise.

The coils fire 2 plugs each, you would most likely have two bad cylinders if there was a coil/plug problem.

An injector being held open by ??? preventing the pintle from closing that then clears itself?

Perhaps you were hearing some other part of the bike being vibrated by the engine? How are the engine bolts? You may want to do a 'wiggle inspection" and see if anything is loose on the bike.

At what point are you going to be able to say that it was a one time deal, forget about it and move on with your life?

 

[jmgrif]

This past spring I changed my (not blue dot cct) on my 2008 Canadian Eh! FJR for the new and improved Blue Dot CCT. I'm the sole owner of the bike so I have made all changes since new! Never had loud noise issues at any time, best bike in the world. I would worry though, if all of a sudden it started making metal to metal noise without an apparent reason? I'm going to pick Door # 2. Make sure the oil level is correct? Time spent worrying is a waste of time!

 

[Fred W]

I don't think anyone was suggesting it was a rod bearing. The OP described the noise as being steady similar to a rod knock, and I was trying to help mcatrophy understand the Americanism, "rod knock."

 

[SoCalFJR1300]

Oil level was good, plugs wern't fouled, just changed after the noise incident, looked good in fact I almost left them in.

Ready to move on especially if I don't hear the noice tomorrow when I go for another group ride.

After I heard the noise last Saturday I went on about a 3 hour ride and it rode fine.

I don't baby the bike, but I don't abuse it either, but I do some higher RPM running on EVERY ride, not always to Redline but shifting at say 7,000 rpm's or so.

THANKS for all the replies and ideas guys.

I'll post an update after tomorrows ride.

 

[ionbeam]

I don't think anyone was suggesting it was a rod bearing. The OP described the noise as being steady similar to a rod knock, and I was trying to help mcatrophy understand the Americanism, "rod knock."

And I was putting a stop to rod knock as a possibility. The OP did describe it as a rod knock, but didn't (yet) say it was rod knock, so I wanted to end that line of speculation before it started.

 

[JR'SFJR]

I had that happen when the bike was newer, but for much longer than a few seconds. Might have been a piece of carbon on the piston? Once in a while I would get a vehicle that sounded like it was coming apart, but after running top engine cleaner, it would disappear.