Engine vibration increases at 5K - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 19 Old 08-09-2009, 10:51 PM Thread Starter
 
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Engine vibration increases at 5K

I thought I'd ask if anyone would have an idea what might be causing an engine vibration that comes on at 4.8K RPM. Now this is not a wheel vibration thing as I can recreate it in 1st gear.

I bought the bike with about 9K miles on it and I know has about 13.5K. The air filter is likely original, the valves haven't been adjusted yet. I do have a ruff spot at 3K when I transition through that but as far as I can tell that is normal until I put a PCIII in it.

Would a PCIII help with this 5K and up vibration?

The throttle bodies have been synchronized at the 1200 rpm range and it is much smoother at the lower rpm's. This was done six months ago so I don't remember if the high rpm vibrations where there originally or not. I remember it being a bit ruff across the entire rpm band before it was synchronized. I guess I could try to tweak it at a higher rpm if it doesn't try to suck up the fluid in the manometer.

This vibration isn't severe but it is definitely noticeable and I don't like running the engine in this range if I don't have to.
I would like to get rid of this vibration as it limits my desire to use half the RPM range. As you know this engine just starts pulling hard at 5k so it is killing some of my fun. Now my VTR1000F engine (Honda V-twin) is a smooth all over. Maybe that is due to the superior technology used, carburetors (just kidding).

Anyone ever have some similar vibration issue and have an ideas of what to try to get rid of it?

Thanks in advance.

Bdudemon

Last edited by bdudemon; 08-09-2009 at 10:54 PM.
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post #2 of 19 Old 08-09-2009, 11:39 PM
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Would help to know what model you own? And........are there any crashbars installed?

BRIAN "GO Buckeyes, GO Wildcats"!

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post #3 of 19 Old 08-09-2009, 11:52 PM
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....are there any crashbars installed?
Or metal panniers? Mine growl like crazy at 5k when they're empty.
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post #4 of 19 Old 08-10-2009, 12:17 AM Thread Starter
 
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2003 DL1000,
SW-MOTECH Crashbars/Engine Guards are intalled and no panniers.
I have foam grips on the bars and the vibration is mostly sensed through the handle bars.
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post #5 of 19 Old 08-10-2009, 02:37 PM
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The 2002/03 DL1000 have a faulty clutch basket design causing vibrations between 4K and 5K rpm. It sounds like that's your problem. Suzuki replaced some when bikes were out of warranty a few years ago but I replaced it myself on my 2002. I think it was a few $100 for parts.
post #6 of 19 Old 08-10-2009, 02:44 PM
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Some complain of vibrations caused by the SW Motech crash bars. You might try removing them and seeing if you still have the vibration issue. Alternatively: https://www.stromtrooper.com/showthread.php?t=43625 Also, see if you can meet up with another Vee owner and take a ride to compare the two. You may just be experiencing normal vibes that you aren't used to on the new bike.

Last edited by Warhammer; 08-10-2009 at 02:52 PM.
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post #7 of 19 Old 08-10-2009, 02:47 PM
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Big B, I have to ask -- did you airlift your bike to Nevada for a ride or something?
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post #8 of 19 Old 08-10-2009, 08:22 PM Thread Starter
 
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I took the bike out for a short trip around the neighborhood running 5-6K rpm in first gear and those crash bars really vibrate at about 5.2K to about 6K. I looked at taking off the crash bars as a test until I realized that my SW-Motech skid plate would have to come off and I really dig that as it is powder coated black on my yellow DL1000 and looks really good. I bought the bike with the skid plate and bars on it so I'm not as familiar with them as I would be if I had initially installed them. I did notice that the largest cross engine bolt wasn't really as tight as it could be so I tightened that up and the 3 of the 4 smaller bolts a bit and the vibes seem a lot less on the 2nd test drive. The vibes that were there where of a higher frequency but much lower amplitude. If that is what I end up with I can live with it, my foam grips (a must have) will filter that out. I have to take a rare 40 mile ride tomorrow morning on the highway instead of going to work at 30 mph, ahh that just sucks so I'll see if if this helped the vibes in the 5K-6K range and report back. I wonder why they didn't design the mounting solution with hard rubber donuts in where the bars mount and cut those spacers in there in half. It would be hard enough to take the impact of the bike falling over and possibly cut down on the vibrations getting to those bars and then being amplified. I notice they do have rubber grommets attaching the skid plate to the bike and to the crash bars, now how about to the bike?

Now after taking that highway ride this morinng it seems about 1/2 the amplitude of the vibes is now gone at 5K and well as across the lower rpms. And it can be felt by grabbing the crash bar when at the rpms. The bars begin to buzz again with a higher frequency at 6K rpm. So tightening the bars helped quite a bit. Especially the main bolt that runs across the span of the engine. So the rest of the vibration is the engine IMO. Has anyone successfully dialed out higher RPM vibration with a PCIII? I believe you can adjust the fuel rate to each cylinder with it so I'm wondering if a little experimentation with the air fuel mix would work. First dial both of them in a basic air fuel mix then try to tweak one cylinder at a time a bit to see if it helps at high rpm. Basically the bike is a joy to ride below 5K which is easy to do but above that it looses that smoothness. My V-twin on my Superhawk with just carbs is smooth all over the rpm range. I would think this engine could do the same if tweaked right. Anyone have a VStrom that is as smooth or very close to it running the engine at 6K rpm as they do at 3K rpm? I haven't rode any others so I have no basis of comparison. I also have to do the clutch modification on this bike next spring and maybe to get rid of the idle clatter or chudder they call it and maybe that is contributing to the vibrations. I also need to get a PCIII for it around Xmas. I have done more of my fair share in supporting the economy lately with spending on my three bikes so I'll have to wait.

Last edited by bdudemon; 08-11-2009 at 01:28 PM.
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post #9 of 19 Old 08-20-2009, 08:04 PM Thread Starter
 
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Latest, well I broke down and bout a PCIII for this bike, rather pricey but you can't argue with results. With the stock map, the PCIII took out the lean snarl at around 2.5K to 3.5K that the bike had. The PCIII made the bike fun to ride down in the lower RPM ranges. I always tried to get to 4K and stay there as much as possible to avoid the snarl and lag experienced with transitioning through the lower RPM ranges. This fixed that. I can detect a very slight snarl once in awhile but it doesn't impact the bikes power or throttle responsiveness. So I'm now a believer that a PCIII is a requirement for this bike.

I still get vibrations starting at 5200 rpm on the bike. Now I if I remember right I don't ever get there if I'm in 6th gear going down the highway so that isn't as big of a deal overall as I don't need to cruise at that RPM. However I will still work on trying to figure that one out since I'm an engineer and I can't help myself. It almost smacks of some resonance based vibration. It is too damn hot here in FL right now to take on any extra garage work so I'll save that for November. I'll pull off the SW-MOTECH Crashbars/Engine Guards then and see what happens.

Why am I posting this? Just in case it helps out one other person with a VStrom DL1000 enjoy their bike more. I'm sure there are many others out there that are new to the Vee out there all the time that have the same issues.

Last edited by bdudemon; 08-20-2009 at 08:06 PM.
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post #10 of 19 Old 08-20-2009, 08:30 PM
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Quote:
Originally Posted by bdudemon View Post
Latest, well I broke down and bout a PCIII for this bike, rather pricey but you can't argue with results. With the stock map, the PCIII took out the lean snarl at around 2.5K to 3.5K that the bike had.
Ok, but ... I still do not understand why so many DL650 owners seem to want to run this bike at potato-potato-potato like a big-bore cruiser (swapping sprockets and whatnot). Why not just run at higher engine speed, ferpetesake, like it's designed to do??

I fail to be convinced that any actual problem is being solved here. This is all subjective silliness. Just my humble opinion, of course.
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