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Old 11-06-2003, 09:29 AM   #1
Loadedagain OP
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lc4 vibration again

someone asked me the question, so i did my best to answer. this is what i told him. what do you guys think?

Quote:
Here it goes…. The lc4’s all vibrate a bit. Even after they have been broken in. there’s nothing you can do about it. Just learn to love it. Once they are broken in (mine woke up at around 6000km) they start to soften out a little. It was funny actually. I was on my normal ride to work, riding at about 80km/h, and with not throttle input the bike started to accelerate. My bike went from break in to broken in instantly. There was a very noticeable gain in hp from that day on. I have been around engines all my life and I have never seen, or felt something like this before. Apparently this is common with the lc4. Some owners say it happened at 3000km and others say 10,000 km. I have not figured out why.

Now she’s finished her running in. it is time to start eliminating the vibration that did not go away with the engines teething pains. I have started at the top and worked my way down, where others have done the opposite. I chose this method because the power without modification is plenty for me. Here is the list of mods I have either done myself, or heard of people doing. Some are proven, others are not.

Bar ends – done this. Adding a few grams of brass out there at the end of your bars seems to help. It really does feel different. Mechanically all it does is reduce the vibrations frequency. I do not believe it dampens at all, but it does improve the feel. Cheap and easy fix.

Silicone in bars – done this. Pump a large tube or two of plain jane clear RTV silicone into the handle bars. This absorbs the vibration like you wouldn’t believe. Doesn’t stop the turn signals from shaking, but your habds feel better. Again…. A cheap and easy fix.

Bolt the engine down – done this. What? Bolt the engine down? Yes! Those bolts that hold this big shaky thumper in the frame come loose after all the shaking. I can’t remember who told me this, but they were right. All the bolts holding the engine in my bike were loose. Torque them to spec. mod cost? Free!

Adjust your valves – done this. How often? As often as you can. When they’re to spec the engine runs smooth like silk. Why is this overlooked? Its in the manual. Mod cost. Free.

Jet your carb – in the works. Many guys who have been on these lc4’s for a few years swear by jetting. I am working on it right now. I am not an expert on it, so I wont tell anyone how to do it. You have any real technical questions about jetting, bug flanny. If he’s nice he may help you. If he doesn’t, do a search of advrider, or ktmtalk.com for jetting tips and lc4.

Now. There are also a host of things that can be done to increase power. Cheap, easies. I am not going to touch those. This is an anti vibration thing only. I do hope this helps. I have found it to be true. I am going to post this in the thumper section too. Lets see what the others have to say.

Talk later,

Colin
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Old 11-06-2003, 10:04 AM   #2
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Loadedagain wrote:

> This absorbs the vibration like you wouldn’t believe. Doesn’t
> stop the turn signals from shaking, but your habds feel better."

"habds"?! - does this indicate that your fingers are still recovering?
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Old 11-06-2003, 12:01 PM   #3
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Looks like I'll be adding the silicone this weekend and the bar ends when I can find someone who has them for sale. Haven't tore the skin off the bike to get at the guts underneath, but so far, the engine mounting bolts I've had access to, HAVE needed to be re-torked. I've got quite a few miles of riding to get to "broke-in" mode.
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Old 11-06-2003, 12:45 PM   #4
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Quote:
Said 1stiski:and the bar ends when I can find someone who has them for sale.

send me a pm. i still have a few sets left.

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Old 11-06-2003, 02:25 PM   #5
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Quote:
Bolt the engine down – done this. What? Bolt the engine down? Yes! Those bolts that hold this big shaky thumper in the frame come loose after all the shaking. I can’t remember who told me this, but they were right. All the bolts holding the engine in my bike were loose. Torque them to spec. mod cost? Free!
Me tell you this white man. How soon they forget the helping hand. Ungrateful gaijin!
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Old 11-06-2003, 02:38 PM   #6
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Quote:
Said Drif10:
Me tell you this white man. How soon they forget the helping hand. Ungrateful gaijin!
i thank you good sir. now. shut up and get back to work
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Old 11-06-2003, 02:49 PM   #7
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Quote:
Said Loadedagain:
i thank you good sir. now. shut up and get back to work
Check the time zone, dognuts. I'm @ home sipping a cerveza
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Old 11-06-2003, 06:41 PM   #8
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Quote:
Said Drif10:
Check the time zone, dognuts. I'm @ home sipping a cerveza
good thing i didna check this til i had juice in hand. i woulda been pissed if i were at werk.

i love you drif
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Old 11-07-2003, 04:29 AM   #9
Flanny
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Loaded..You 'da man...That's the anti-vibe list to end all anti-vibe lists!
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Old 11-07-2003, 08:34 AM   #10
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Quote:
Said Flanny:
Loaded..You 'da man...That's the anti-vibe list to end all anti-vibe lists!
yabbut. did i lie? you did some other stuff too, didnt you?
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Old 11-07-2003, 08:39 AM   #11
Flanny
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Quote:
Said Loadedagain:
yabbut. did i lie? you did some other stuff too, didnt you?
Nope..That's it man...that's the list - you nailed it!
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Old 11-07-2003, 06:51 PM   #12
DirtyVFR
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Vibe list

I know these are items to deal with existing vibes, (unlike Loaded's excellent "vibe-killer" list). But do we have any Best Practices for:

Anti-vibe mirrors?

Different grips?

Peg mods?
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Old 11-07-2003, 09:03 PM   #13
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Best Mirrors --> I use Honda XR650L mirrors - they come with anti-vibration (via rubber bushing) mounts. They work well on my Laverda 750 which is a confirmed vibrator...
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Old 11-07-2003, 10:50 PM   #14
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Re: Vibe list

Quote:
Said DirtyVFR:Anti-vibe mirrors?
you bellowed?

ever think of pulling from the ktm parts bin? try the duke ii mirrors. i have a set on my bike. so does scotty (thanks for the idea dude). nice, low, and they dont shake. almost like they figured something out late in a model, but never carried it over to us.

btw.... have you noticed the duke ii comes with brass bar ends?
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Old 11-08-2003, 08:12 AM   #15
Flanny
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I use the Dual-Star anti vibe mirrors...work like a charm.

I have them mounted on top of the IMS folding mirrror perches.
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