Noise opinion

MikeM

Well travelled
Location
So Cal USA
Is it louder when its cold? The noise is similar to a detonation now, kinda like a cylinder rattling (clatter)? Mine does that but does it a lot less now.
 

tom_d

Well travelled
Location
US
Hi, I know this is an older post but I was hoping you might have some updated info. I have EXACTLY the same issue with my 2022 Himalayan. Everything is fine until I hit about 3700 RPM then it


Hello! I know this is an older post but I was hoping you might have an update on this issue. My 2022 Himalayan does the exact same thing. Everything is fine until 3700 RPM then, from the top end I can hear a knocking sound (almost like bad gas or a timing issue) as it revs up. But here's the thing; if you listen to the exhaust note it sounds fine. It doesn't lose power, it's responsive and rides fine. The noise is most pronounced when I listen directly above the gas tank. I've got about 800 miles on it and it's done it from day one and isn't getting better. First service was completed, exhaust valve good and only a minor adjustment to the intake valve. Changed to an iridium plug but that didn't help.

It's most noticeable in 2nd, 3rd and 4th gears and can be heard a little in 5th. Revving the bike in neutral won't reproduce the sound. Typically happens more noticeably when it's *not* under a heavy load (for instance, it's far less pronounced [or nonexistent] when going uphill with a lot of weight on the bike). But if you're just cruising around and stretch out second or third gear, you can really hear it.

I've read about the harmonics but this seems different to me...but I'm not an expert. The fact that it doesn't lose power and has a clean exhaust note is what has me truly confused. That and the fact that revving in neutral is no problem. Many other threads point to various idiosyncrasies that smooth out as the bike breaks in (runs in). Was this your experience? Did it finally go away?

Any thoughts or opinions would be welcome.
There are some items under the tank, but the vibration doesn't usually make them rattle but you can check them the next time you are under there. You can try premium fuel for a couple of tanks and see if you hear a difference. A note about the cockpit experience, the windshield is at a perfect angle to reflect the sounds which come from the engine or bounce up from the ground and direct them to you so may be more amplified or pronounced in one spot vs another due to this. There are some points where vibrations can makes some noise, but they are all harmless. If your chain is adjusted correctly, your valves set correctly, and your oil level correct, then all is probably fine but will be glad to try to pinpoint the issue if you wish.
 

Bluestrom13

Well travelled
Location
Elswhere
Mine's made "noises" from day one. Lessened as the miles totted up, but still there when I make the effort to hear them. (Note - plural).
Done approaching 10K now in a little over 12 months. If it was going to break, it surely would have done by now.
A friend has more than double my mileage on his, same story.

Air cooled motor, gear driven balance shaft and weight, oil pump sprocket held on by goodwill. All add up. I've heard the term "cacophony" used to describe it.

The tappets, on the other hand, are a mere whisper when I put my ear to the cam box. :)
 

tom_d

Well travelled
Location
US
Mine's made "noises" from day one. Lessened as the miles totted up, but still there when I make the effort to hear them. (Note - plural).
Done approaching 10K now in a little over 12 months. If it was going to break, it surely would have done by now.
A friend has more than double my mileage on his, same story.

Air cooled motor, gear driven balance shaft and weight, oil pump sprocket held on by goodwill. All add up. I've heard the term "cacophony" used to describe it.

The tappets, on the other hand, are a mere whisper when I put my ear to the cam box. :)
Mine became noticeably quieter and ran stronger over time, probably 2-3 thousand miles. It was weird because I hadn't own a new vehicle or do I remember something which was different after a appreciable time frame.
lol, I was going to mention the internals can make noise but didn't want to cause concern, but yeah the oil pump kinda makes me chuckle. It always does its job, but since its strength is only where needed to do its job, its allowance for play and relative simplicity can be a surprise. It seems a solid design by a great engineering group, i bought it because it was engineered to be easier to maintain and was less complicated and it has lived up to that reputation.
 

Typhoon

Well travelled
My himi makes a metallic grind that increases when idling on the side stand, yet quietens down when you straighten the bike up. Sounds like cam in cyl head trying to seize as it sounds at half engine speed. I also have the 3500 rpm I'm gonna self destruct sound too. Anyone else sorted this?
 

tom_d

Well travelled
Location
US
@t
My himi makes a metallic grind that increases when idling on the side stand, yet quietens down when you straighten the bike up. Sounds like cam in cyl head trying to seize as it sounds at half engine speed. I also have the 3500 rpm I'm gonna self destruct sound too. Anyone else sorted this?
@Typhoon i haven’t seen a post reporting this. What does the dealer say? Perhaps this should be looked at?
 

American Tom

Getting there...
Thanks everyone. I'm just going to keep on chugging. If it were a bearing it wouldn't diminish in noise level as mine does past 4200 rpm. Load wouldn't matter either. I'm thinking the ECM *may* have something to do with it....I know they (RE) tinker with the mix starting at mid band, probably for emissions. Maybe it leans out too much. I'll be looking into that next. Appreciate you all.
 

MikeM

Well travelled
Location
So Cal USA
While I was testing out the fork emulators I was reaching around and holding various parts of the headlight and instrument cluster during the 4000 rpm rattle. I was able to dull the sound by pressing on the headlight bucket. Time to dig into that issue.
 

tom_d

Well travelled
Location
US
Ahhhhh, exhaust wrap, it can be the gift which keeps giving. Condensation seems to really love them, their aftermath usually looks to me a mix between old duck tape and the rusted stainless tableware found hiding in the dishwasher. :)
The ring around the light bucket was my buzz, the windscreen focused it nicely at my head just in case I might otherwise have missed it. I couldn't detect the origin at first, but I recycled the full tuck position from my earlier days so I could test muffling various items in situ. I used rolled up electrical tape at strategic locations on the light bucket's rim as my quicky fix which has held so far.
 

Typhoon

Well travelled
Got rid of that tinny sound . The pipes are single wall and really need another brace/mount on the horizontal so the head doesn't take the force of impacts . Oldmate Roy's hooking me up with a replacement pipe I'm gonna decat and derestrict at the muffler joint where it steps down a few mm and I'll make a mount that bolts to the engine mount. I'll share some pics when I get it done. As to the pipe getting damaged, mine already looks like it's been thrown around the factory for a week or so before fitting
 

American Tom

Getting there...
I will consider that wrap. I know there are some down sides but the noise I'm dealing with has a lot to do with the single wall pipe. As the revs climb it sounds like the exhaust gasket is missing (it's not, and everything is tight). Unpleasant. I love the bike, but I've had a lot of thumpers over the years and have to say I've never heard a racket quite like this.
 
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