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It can be done.....

Started by Speeddog, October 22, 2010, 06:50:38 PM

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Speeddog

October 22, 2010, 06:50:38 PM
40k miles on my S4, *no* flaking rockers.  ;D

- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

DucHead

#1
October 23, 2010, 06:52:12 AM
 [thumbsup]

I'm pulling my cams out next month to check the rockers.   :)
'05 S4R (>47k mi); '04 Bandit 1200 (>92k mi; sold); '02 Bandit 1200 (>11k mi); '97 Bandit 1200 (2k mi); '13 FJR1300 (1k mi); IBA #28454 "45"

Bill in OKC

#2
October 23, 2010, 01:03:50 PM
Quote from: Speeddog on October 22, 2010, 06:50:38 PM
40k miles on my S4, *no* flaking rockers.  ;D

What kind of oil are you using?
'07 S4Rs  '02 RSVR  '75 GT550  '13 FXSB  '74 H1E  '71 CB750

Turf

#3
October 23, 2010, 01:09:37 PM
You do realize now that you're doomed right?

Next post will be about how you shouldn't brag about your flakeless rockers

No worries, just preparing myself for 996 ownership  ;D
I may not have gone where I intended to go, but I think I have ended up where I needed to be.

lazylightnin717

#4
October 23, 2010, 06:52:39 PM
Has this been a big issue with the S4's? Is there any easy way to check?
Comes a time
When the blind man takes your hand
Says don't you see
Gotta' make it somehow
On the dreams you still believe

Langanobob

#5
October 24, 2010, 12:45:43 AM
Quote from: Bill in OKC on October 23, 2010, 01:03:50 PM
What kind of oil are you using?

Bill, That was my first thought also. But isn't the problem due to fatigue of the plating bond and not due to any sort of wear?  So it wouldn't make much difference what oil was used?   

Bill in OKC

#6
October 24, 2010, 03:00:02 AM Last Edit: October 24, 2010, 03:06:05 AM by Bill in OKC
I had read that the problem was caused by poor oil feed during cold starts - the problem was rare in the horizontal exhaust rockers supposedly because they sat in an oil bath when the engine was off.  The vertical exhaust rockers were the ones that were most vulnerable because it took a while for oil to reach them after the engine was started.  A friend's street legal 748R had the problem, and again with Megacycle re-chromed rockers.  It has over 30K miles now and they just found a problem with the main bearings, I guess they are narrower than the regular 748 bearings and stress the cases more, enough to have started cracking around the edge of the bearing :(
'07 S4Rs  '02 RSVR  '75 GT550  '13 FXSB  '74 H1E  '71 CB750

ducpainter

#7
October 24, 2010, 09:35:08 AM
Quote from: Speeddog on October 22, 2010, 06:50:38 PM
40k miles on my S4, *no* flaking rockers.  ;D


So...

what's the secret?
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#8
October 25, 2010, 01:00:06 PM
Secret? I wish!  [laugh]

I've kept up on the valve clearances.
Tried to always let it warm up before getting the rpm very high.
Spectro dino oil, Spectro synth blend, Motul 5100 synth blend oils.
Seldom run the engine past 7k rpm.

The above, combined with a large helping of luck...
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

ducpainter

#9
October 25, 2010, 01:03:39 PM
Quote from: Speeddog on October 25, 2010, 01:00:06 PM
Secret? I wish!  [laugh]

<snip>

The above, combined with a large helping of luck...
I was afraid you'd say something like that. ;D
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


Speeddog

#10
October 25, 2010, 01:40:32 PM
Anecdotal evidence is that rpm is the main thing, citing more flaking rockers on 748's than other DQ's.

I've got an ST3 waiting for 3 new opening rockers at 23k miles, I'm pretty convinced that was just neglect, as all the closers were .012"-.021"...  :o
- - - - - Valley Desmo Service - - - - -
Reseda, CA
(951) 640-8908

~~~ "We've rearranged the deck chairs, refilled the champagne glasses, and the band sounds great. This is fine." - Alberto Puig ~~~

DUCMONROB

#11
October 27, 2010, 01:26:43 AM
I know this issue is with the Desmoquatro motors but is there any similar issues with the Testastretta?

998 owner Rob
M1000SDS, ZZR1200, GPZ900R.
Gone:
900 Monster Special
S2R1000
998 Matrix

ducpainter

#12
October 27, 2010, 04:01:11 AM
Quote from: DUCMONROB on October 27, 2010, 01:26:43 AM
I know this issue is with the Desmoquatro motors but is there any similar issues with the Testastretta?

998 owner Rob
Not as regularly as the Desmoquattro.

I hear that you'll see the occasional flaker.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


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