K11 Owners Group

drikko · Posted: Wed Jan 27, 2010 9:15 am Post subject: TB Sync

After I had disturbed the #1 cylinder throttle setting the other day, I made a guess at where to set it. Then on the ride yesterday (see photos section) I noticed it was running terribly, coughing and spluttering, in particular backfiring on the run down. Also at idle there was a graunching clunking coming from the engine, it was truly terrifying. I have to admit it sounded so mechanical I didn't connect the 2 issues together, I just thought I'd blown a big end or the timing chain tensioner was stuffed or something. The Kspert with us (riding the F800) wasn't sure what it was either.

Anyway to cut a long story short I borrowed the Vacuum syncing meters, a 4 meter jobby, and started to fiddle, calibrated them first off one cylinder and plugged it in to all cylinders. The one I had disturbed was way off so started to adjust it, the noise got worse, screwed it the other way until the vacuums were equal and wow, the noise went away and it started running beautifully! #4 was a bit out too, so adjusted that as well, #2 was spot on.

What a difference it made! idles like a singer sewing machine now! Thanks for the advice and instructions on this, really appreciated.

So if it's rough running especially at idle get it done! Magic, feels like a new bike!! Shocked

_________________
K1100RS '97
Laverda RGS 1000 '84
Jim Young Trailer Sailer 5.7M WB

DISCLAIMER:- Anything I say may have been when I was drunk so please don't take it personally.

'Bigamy is having one wife/husband too many. Monogamy is the same.'
Oscar Wilde

SugarHillCTD · Posted: Wed Jan 27, 2010 10:44 am Post subject:

Looking forward to it-

Last year I purchased the gauges and tried to sync the TBs.

#2 couldn't be adjusted to agree with 1, 3 & 4. I then sprayed WD-40 around the base of TB and the bike's idle evened right out.

I'll be replacing the TB "boots" in the next week or so.....
_________________
John & Cathy

'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F.

heatmizr · Joined: 25 Jan 2010 Posts: 16 Location: Charlotte NC

Could you elaborate on the WD-40 please? Are you implying that it sealed a leak or crack in the boot that you will now replace?
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Todd Glasier in Charlotte, NC
1996 k1100rs (on loan)
2002 RC1
2000 VFR

Flying Duck · Posted: Wed Jan 27, 2010 1:46 pm Post subject:

WD-40 used to be* flammable. I think he's implying the boot is cracked, leaking air and needs to be replaced.

(* WD-40 is not longer flammable)
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93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

SugarHillCTD · Posted: Wed Jan 27, 2010 2:49 pm Post subject:

drikko · Posted: Wed Jan 27, 2010 3:50 pm Post subject:

Woops, sorry, I meqnt to post this in the tech forum, feel free to shift it! Must have had too many sherberts.
_________________
K1100RS '97
Laverda RGS 1000 '84
Jim Young Trailer Sailer 5.7M WB

DISCLAIMER:- Anything I say may have been when I was drunk so please don't take it personally.

'Bigamy is having one wife/husband too many. Monogamy is the same.'
Oscar Wilde

Flying Duck · Posted: Wed Jan 27, 2010 4:54 pm Post subject:

SugarHillCTD · Posted: Wed Jan 27, 2010 5:13 pm Post subject:

Drake,

Either way it would improve the mix on that cylinder- if it was the flammable WD, it would offset the extra air coming through the cracked boot. If it was the non-flammable WD it would very briefly "seal" the cracked boot.

Being that I could NOT get the TBs sync'd (and I know that this can also be the result of bad valve adjustment- which I am doing in the next few days..) I have to figure that the rubber parts of the intake are faulty.

But thanks for helping me explain the WD stuff Very Happy

John
_________________
John & Cathy

'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F.

Jim · Posted: Thu Jan 28, 2010 12:51 am Post subject: