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1Back to top Go down    Vibration Reduction on Mon Aug 31, 2015 5:40 pm

Be made

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After many months of procrastination I have finally got around to resetting the engine/gearbox - frame bolts to the correct torque settings and tightening them in the correct sequence.

I also replaced the Cam chain guides and the Cam chain. I had a brand new one from the recond of the other engine (which only survived 3000k's due to another wrenches #$@%up) so, after giving it a lot of thought and consideration I thought to myself that maybe these things was responsible for at least some of the vibes. And I was right.

I have experienced about a 50% reduction in vibes and now it is at least bearable. I no longer get a numb hand until at least the first 45 minutes has passed as opposed to previously 15 - 20 minutes and when the hand does go numb it is restored a lot quicker - within a minute or so as opposed to about 2 - 3 minutes previously. I really enjoyed doing the job and had a great sense of satisfaction when we rode out for the first time when it was finished. According to Mr Haynes I had to remove both left and right engine covers to get the front one resealing properly but it was all good. The old guides showed a little bit of wear on the top one so I assume that was part of the source of vibration.

With my old engine, when I pulled it down to rebuild @ 110,000 k's, one of the guides was nearly sheared through and it looks like I just reached it in time. I am glad I have done this, I have great piece of mind knowing it has been done and will be good for another 60 - 100k.

My engine now has 66666ks on it.



P.s - I have an appointment at the hospital plastics unit for the carpel tunnell assessment on 18 sept :-)

    

2Back to top Go down    Re: Vibration Reduction on Mon Aug 31, 2015 6:06 pm

Brad-Man

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Wonderful that you forestalled a disaster and reduced vibration at the same time!

Have you sync'd your TB's?

Regards,

Brad


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Toys don't make the man - Man makes the toys....
    

3Back to top Go down    Re: Vibration Reduction on Mon Aug 31, 2015 7:46 pm

Be made

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@Brad-Man wrote:Have you sync'd your TB's?

Regards,

Brad
Yep. Everything else is perfect at the mo bro.

Thanks for the post

    

4Back to top Go down    Re: Vibration Reduction on Mon Aug 31, 2015 8:23 pm

indian036

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Can't tell from your images. How are your handlebar end weights? My K100 came without any, and a cheap set from eBay (marked with the triple tuning forks logo if you look closely) made quite a difference.
I'll be making a new heavier set on the lathe when I get a chance to see how more weight goes.

The lead shot in the handlebars idea may have merit, but my lead shot was too fine and fell through the handlebar holes in the middle. Maybe buckshot.

Bill


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1985 K100RT Red. VIN 0028991K100RT ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT ENG 104EA32848523
    

5Back to top Go down    Re: Vibration Reduction on Mon Aug 31, 2015 8:53 pm

Be made

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@indian036 wrote:Can't tell from your images. How are your handlebar end weights? My K100 came without any, and a cheap set from eBay (marked with the triple tuning forks logo if you look closely) made quite a difference.
I'll be making a new heavier set on the lathe when I get a chance to see how more weight goes.

The lead shot in the handlebars idea may have merit, but my lead shot was too fine and fell through the handlebar holes in the middle. Maybe buckshot.

Bill
Yeah . . I had 330gm when purchased the bike as a standard LT and stupidly lost one. The heaviest I can get now is 170gm. Will add them at some point

    

6Back to top Go down    Re: Vibration Reduction on Fri Sep 11, 2015 1:03 am

Be made

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@Be made wrote:Yeah . . I had 330gm when purchased the bike as a standard LT and stupidly lost one. The heaviest I can get now is 170gm. Will add them at some point
Bar weights added today. Same as the last lot. 330gm. A lot better but still wanting to improve

    

7Back to top Go down    Re: Vibration Reduction on Fri Sep 11, 2015 6:19 am

Dai

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What speed is the worst vibration? I'm curious because my RS is a magic carpet up to about 60mph, at which point I get a high-frequency vibration. It's useful for not having to look down at the speedo but otherwise, damn annoying. At around 75mph it smooths out again.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

8Back to top Go down    Re: Vibration Reduction on Fri Sep 11, 2015 6:44 am

92KK 84WW Olaf


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The dreaded 4,000rpm vibration. Funny thing is my vibes on the RT disappeared.


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 81,400miles
    

9Back to top Go down    Re: Vibration Reduction on Fri Sep 11, 2015 11:31 am

Point-Seven-five

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Have the balance of the front wheel checked.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

10Back to top Go down    Re: Vibration Reduction on Fri Sep 11, 2015 4:06 pm

Dai

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The wheels are rebalanced every time I change the tyres. As Olaf says, it's probably the built-in 4k vibrator.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

11Back to top Go down    Re: Vibration Reduction on Fri Sep 11, 2015 6:25 pm

AL-58

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My RS is good, The 'new' RT is good and smooth. My sidecar is terrible at around 3500rpm, the bars buzz, the fairing buzzes etc. One of todays projects is complete disassembly of the fairing on the sidecar bike and very careful reassembly to see if I can find the source of what's moving and buzzing with the motor.

Front wheel balanced finally yesterday, no more shake at 100kmh. It took a lot of weight, really I need to get a flat spot in the rim fixed, but for the moment it's not shaking anymore Smile. It's a custom 3 piece aluminium 15" wheel so I cant just buy another.

Al


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (an ongoing renovation project, registered and on the road with original patina)

'87 K100RT with Paralever backend

"money cannot buy happiness, but it can buy another K and that's the same thing"

    

12Back to top Go down    Re: Vibration Reduction on Sat Sep 12, 2015 1:54 am

Be made

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Thanks for the posts guys. Front wheel balance is not an issue. Vibes are terrible when engine is cold, better once warmed up, really noticible around the 100k mark, non existent @ 160 +

That might be the answer !

Just stay above 160 :-) :pirat:

    

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