engine knocking

[broncodave]

Have tenere with 1500 miles and have noticed an engine knock on acceleration since new. I kinda ignored it waiting until it was broke in. Now it's broke in and I'm starting to worry. It sounds like piston slap or predetination. Mainly around 3000 rpm in 1st or 2nd gear, if you whack the throttle, it will knock for a little bit and then clear up. Originally thought it was related to traction control because mainly did when I was on gravel and traction control engaged at same time. I've experimented with traction control off, and it still does it. It is worse on slippery surfaces. I tried to search for other posts with similar issues but couldn't find anything. I have no idea if this is related to the stalling issues I talked about in other posts.

And YES, I always run premium in it. This is NOT a California model.

Anyone else with this experience?

 

[~TABASCO~]

Does this same thing happen it TC1 - TC2 & TC off?

Does it do the same thing in (S) & (T)...

Is your bike (engine) stock ?

No headers, no muffler, no PCV ?

Do you always fill up at the same station ?

 

[Spider]

If it is piston slap, it will end up self destructing and you will get a new engine under warranty. To see if it is knock, you might try some aftermarket octane boost in a tank of gas (or buy a tank of 100LL at the local airport if you're not worried about disabling your catalytic converter). If the higher octane makes the problem go away, best bet to fix the problem would be a powercommander or the like. If the higher octane doesn't make a difference, could be something minor like an exhaust system issue. Which will take some experimentation to diagnose.

Good luck!

G

 

[dcstrom]

I've noticed the same thing. I occurs under the same kind of conditions you would expect for pinging - that is, large throttle openings from lower revs. If it IS pinging, it's the weirdest pinging I've ever heard. It's a deep knocking sound, more like a failed big end than the high-pitched rattle of detonation.

If it IS a big end or something bad internally (again, I really really doubt it), all the more reason to hammer the crap out of it and hope it self-destructs before the end of the warranty period

It doesn't matter what fuel is in it, standard, mid or premium, so I'm pretty convinced it's not some form of pinging. Also fairly sure it's not a big end, so I've so far put it down to being one of the many weird noises that come out of this engine.

We can't be the only ones that have heard it?

 

[broncodave]

Does this same thing happen it TC1 - TC2 & TC off?

Does it do the same thing in (S) & (T)...

Is your bike (engine) stock ?

No headers, no muffler, no PCV ?

Do you always fill up at the same station ?

Yes, it does it in TC1, TC2, and off. In the off, it goes away quicker just because the RPMs rise faster. I think it does it in T-mode.. i ride with earplugs and can slightly hear it sometimes. I've only ridden without earplugs once... today i rode it up my rode without a helmut and knock sounds really bad. Bike is completely stock. I do not always fill up at the same station.

 

[broncodave]

I've noticed the same thing. I occurs under the same kind of conditions you would expect for pinging - that is, large throttle openings from lower revs. If it IS pinging, it's the weirdest pinging I've ever heard. It's a deep knocking sound, more like a failed big end than the high-pitched rattle of detonation.

If it IS a big end or something bad internally (again, I really really doubt it), all the more reason to hammer the crap out of it and hope it self-destructs before the end of the warranty period

It doesn't matter what fuel is in it, standard, mid or premium, so I'm pretty convinced it's not some form of pinging. Also fairly sure it's not a big end, so I've so far put it down to being one of the many weird noises that come out of this engine.

We can't be the only ones that have heard it?

Have others mentioned it? I have not ridden or heard any other teneres so nothing to compare it to. It's going to dealer Saturday for throttle body sync....not sure if that will help. Maybe some of it could be because it's lean but I can't believe that would be the only contributing factor.

 

[jajpko]

If you were to install a Power Commander, it will not change the Octane of the fuel. It will however change the Air/Fuel mixture.

 

[veets]

FWIW

When my carbs were out of sync and I hit the throttle hard it would hammer pretty loud.

 

[Spider]

If you were to install a Power Commander, it will not change the Octane of the fuel. It will however change the Air/Fuel mixture.

Agreed. In my experience, a somewhat richer mixture than is necessary to meet EPA standards can reduce pinging without changing the type of gas used. A really lean mixture can create hot spots. Since it isn't possible to lower the compression of the engine, and expensive to add octane boost to premium gas, this might help.

Anyway, good luck!

G

 

[Kevhunts]

Have tenere with 1500 miles and have noticed an engine knock on acceleration since new. I kinda ignored it waiting until it was broke in. Now it's broke in and I'm starting to worry. It sounds like piston slap or predetination. Mainly around 3000 rpm in 1st or 2nd gear, if you whack the throttle, it will knock for a little bit and then clear up. Originally thought it was related to traction control because mainly did when I was on gravel and traction control engaged at same time. I've experimented with traction control off, and it still does it. It is worse on slippery surfaces. I tried to search for other posts with similar issues but couldn't find anything. I have no idea if this is related to the stalling issues I talked about in other posts.

And YES, I always run premium in it. This is NOT a California model.

Anyone else with this experience?

Better get it documented at the dealer NOW before it grenades.

 

[Z06]

Mine makes a noise like being described. Usually one knock right when you hit the throttle. Did it before and same after ECUnleashed reflash. Still have 4 years 8 months of warranty left so no worries.

 

[simmons1]

Mine does the same thing. Has done it since new.

 

[coastie]

Mine will make the pinging noise at times if you blip the throttle while idling, but I solved the problem by not doing it. Have not had a problem since. I just chalk it up to being a big bore inline twin.

 

[markjenn]

Diagnosing strange engine sounds over the net is always problematic, but big twins like the S10 are not terribly fond of big throttle openings at 3K RPM, especially if you're "whacking the throttle" open. This is lugging the engine in my book and engines that are lugging tend to make bad noises - a combo of knocking, piston slap, and general "stop doing that" noise.

There may be something wrong, but based on your description, I vote that you're simply using the engine outside its design envelope.

- Mark

 

[broncodave]

road bike more today without helmut and earplugs, def. does it in T-mode. It does it even if you roll on the throttle (not whacking) but it's worse when you whack it. If you are at anything less than 3000 rpms and roll on, it will knock right at 3000 rpm. We're talking gently rolling on .....

I bought it to use as a dual sport. For me, when I'm offroad in rough situations, I can't ride above 3000 rpms without wrecking the bike. So not riding in that range is not an option for me. I don't go for the "it doesn't like it so don't do it" scenario.

 

[markjenn]

I can't ride above 3000 rpms without wrecking the bike. So not riding in that range is not an option for me.

I don't get this at all as there is nothing about revving the bike above 3K that makes it in any way uncontrollable - just use less throttle and more RPM. The only real restriction that a 3K floor on RPM places is that you can't do big throttle at speeds less than 15 mph or so without clutch slipping, which might cause issues in technical terrain and hills where you can't maintain speed (e.g., a steep uphill picking your way around rocks). But that's usage well outside the bike's normal operating envelope.

In any event, I'd try and ride others to assess whether yours is different. But based on what you've said, I'll stand on my judgment that what your bike is doing is normal. You might be able to make some incremental improvements with tuning, exhaust, PC, ECU remaps, etc.

- Mark

 

[broncodave]

Basically it is the speed. What I am referring to in my riding conditions which are dirt roads with large potholes. I like to go quite slow and be able to hop the front wheel across the potholes which if the rpms were up in the 4-5k range, speed increases and usually I will get wheel spin instead of tire lift. I completely understand what you are saying, I thought the was supposed to be a dualsport bike.

Also what is the PCV mod? I see it referenced a few places but have no idea what it is and keep forgetting to ask. I plan on doing exhaust and few other upgrades but waiting a year.

 

[markjenn]

Basically it is the speed. What I am referring to in my riding conditions which are dirt roads with large potholes. I like to go quite slow and be able to hop the front wheel across the potholes which if the rpms were up in the 4-5k range, speed increases and usually I will get wheel spin instead of tire lift. I completely understand what you are saying, I thought the was supposed to be a dualsport bike.

I understand better your usage and why you are having the issues. The S10 isn't really very well-suited to what you're talking about.... popping the front wheel over obstacles at slow speed. Discussions about bike classifications are always contentious, but most wouldn't classify the S10 as a dual-sport bike, at least not in the sense of a DRZ being a dual-sport bike. You're using it a bit outside the normal operating envelope of a 625-lb adventure tourer. But you run what you brung. Have you tried clutching-up rather than relying on a throttle wheelie?

Also what is the PCV mod? I see it referenced a few places but have no idea what it is and keep forgetting to ask. I plan on doing exhaust and few other upgrades but waiting a year.

Power Commander V. The latest version of the power commander fuel enrichening device. This might allow you to richen up the mixture a bit in the rev range you're operating in and lessen the problem.

Good luck getting a solution,

- Mark

 

[jajpko]

You can mod your bike with a can, headers, and PCV to lift the front wheel If you have the grip. I would prefer a lighter bike with chain drain. Then you can change the gearing to do exactly what you want. That's just my opinion.

From what you describe (very low rpm and twisting the throttle to lift the front end) sounds like you are lugging the engine.

 

[Brntrt]

Mine does something very similar in off road conditions and I chalk it up to the TC kicking in and cutting the engine back. If turn the TC off the and whack it,the knocking is eliminated.


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Mark