K11 Owners Group

SugarHillCTD · Posted: Mon Aug 03, 2009 8:26 am Post subject: SURGING - j o, you out there?

OK boys and girls, (BTW, this is kinda' long)

The K I love to hate is back together (new clutch disc, "O"ring and rear engine seal) NO LEAKS!!!

Saltcreek and I did a short ride so I could show him the Kanc'. Bike feels good now that I am getting used to a clutch that REALLY engages- apparently it had been leaking onto the old clutch for a while......

Jim and I parted ways at the Bear Notch road and I went home to pick up SWMBO for an afternoon ride and dinner (our anniversary).

Almost immediately once Cathy and I hit the road a new problem surfaced- NO LAUGHING, OTG!!

The bike runs strong on acceleration and at almost all other times. But when I am in a higher gear and around 3-4000 rpms and feathering the throttle between accel and decel the bike is SURGING. Never felt that before.

Now just before the clutch job I sync'd the TBs. Or I should say I tried. I am using a 4 gauge setup but I could not get them to completely sync. On 2 cylinders I lightly bottomed the air screws but couldn't get those gauges to go any higher- the other two were the opposite.
I figured that this meant that a valve adjustment is due this winter, so I called it good and then went on the ride with Saltcreek. The bike felt somewhat smoother but DID NOT SURGE. It started once I had Cathy on the back (no weight jokes here- she will kill you and me)

ANY IDEAS??????

Is it similar to what j o went through a few months ago? http://www.k11og.org/forum/viewtopic.php?t=6469&highlight=surging

TPS? Leaky/cracked intake rubber sleeves? I am stumped.

Remember it accelerates hard better than ever.

This one might be my fault (?)

Thanks for ANY help.

John
_________________
John & Cathy

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

Saltcreek · Posted: Mon Aug 03, 2009 8:54 am Post subject: Re: SURGING - j o, you out there?

SugarHillCTD · Posted: Mon Aug 03, 2009 9:25 am Post subject:

I'll let you know later today- ran out of daylight on Saturday
_________________
John & Cathy

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

owrstrich · Posted: Mon Aug 03, 2009 9:46 am Post subject:

my issue was that when i was f ing with some under the tanks secret modifications pieces i got a piece of foam rubber onto the throttle cable...

once i looked at it i saw it and pushed it away with my finger and it has not happened again...

j o
_________________
yeeeeeehaaaaaaa...

SugarHillCTD · Posted: Mon Aug 03, 2009 10:10 am Post subject:

Ya' know- when I did the sync I had to move that rubbery heat shield piece to get to the TBs. Thought I had put it back correctly......

Maybe not.

Thanks for the heads-up, j o. And the crabby pictures.

John
_________________
John & Cathy

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

SugarHillCTD · Posted: Mon Aug 03, 2009 3:00 pm Post subject:

OK, did a short ride without my lovely wife as passenger (ya' never know who is reading this stuff)

Surging is still there. If I get the throttle in just the right spot between accel and decel it almost feels like something is very quickly turning the ignition off/on/off/on.

But otherwise the engine is running great. No hesitation, no backfiring and strong going up through the gears. None of the surging if I am "on the gas"

Gonna' pull the left side of the fairing off in a little while.

I am suspecting the TPS.
_________________
John & Cathy

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

Saltcreek · Posted: Mon Aug 03, 2009 4:51 pm Post subject:

You seemed sure it wasn't doing it when we rode. I just happened to pull my left cover off today and it looked like that heatshield piece had shifted so I crammed it back in but it seems like it would be easy to get it interfering with throttle movement. Can ths be duplicated at a stop on the centerstand?
_________________
Jim

1994 K1100LT Mystic Red, bfd, 37000 miles, sold Sad

2009 Wilderness Systems Zephyr 155 ST
2002 Litespeed titanium

Scott_Anderson · Posted: Mon Aug 03, 2009 6:02 pm Post subject:

Saltcreek · Posted: Mon Aug 03, 2009 6:08 pm Post subject:

SugarHillCTD · Posted: Mon Aug 03, 2009 8:02 pm Post subject:

FIXED

Remember that I couldn't quite get the TBs sync'd?

Today once I pulled the left side of the fairing and hooked up the gauges the non-sync'd situation still existed. No interference with the rubber heat shield.

So I listened and also put my fingers around the intake. Found it-

Air leak.

Cylinder #1- the narrow hose clamp attaching the rubber "boot" from the TB to the cylinder head was loose- took 2 full turns to snug it up. #3 took nearly a full turn. Then I backed off all 4 and wiggled the TB bank downward to make sure they are fully seated. Then I tightened all 4. Done.

Hey- the TBs now sync. And the surging at speed is gone.

I have never touched these clamps so I'm letting myself mostly off the hook. Guess they worked loose over time.

Not going to jinx myself by saying how the bike is now running.

End of story- but check your intake boot clamps!
_________________
John & Cathy

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

Jim · Posted: Mon Aug 03, 2009 10:51 pm Post subject: SURGING

Good to know you got the problem sorted. Hopefully you won't have any more issues with the brick - other than pennies to maintain maintenance...
_________________
Jim
1997 K1100LTSE 94,000 - still has gremlins!
1995 R100RT Classic 16,650 crashed - repaired!
1992 K75RTP 46,000

"We shall not all die, but we shall all be changed."

SugarHillCTD · Posted: Tue Aug 04, 2009 5:56 am Post subject:

whyoldbill · Posted: Tue Aug 04, 2009 11:12 pm Post subject:

SugarHillCTD · Posted: Wed Aug 05, 2009 6:00 am Post subject:

SugarHillCTD · Posted: Wed Aug 05, 2009 6:25 am Post subject:

WAIT!

Getting closer.....

_________________
John & Cathy

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

SugarHillCTD · Posted: Fri Aug 07, 2009 4:50 pm Post subject:

AARRGGHHHHHHHHHHHHHHH!

THIS P.O.S. is gonna' put me over the edge.

Surging worse than ever. Anytime I am "feathering" the throttle between accel and decel it feels like the ignition is being switched off and on rapidly.

If it was running halfway decently I would trade it in tomorrow. PERIOD.
_________________
John & Cathy

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

Flying Duck · Posted: Fri Aug 07, 2009 5:54 pm Post subject:

It could be the ignition switch. You could try hotwiring the bike at the ignition connector to see if that eliminates the problem.

Or if you want to pay shipping I could send you one to test with.
_________________
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: Fri Aug 07, 2009 6:25 pm Post subject:

Thanks for the offer. That will definitely be on the list.

Funny thing is that under acceleration, even over rough pavement, the bike is really strong. It feels like an electronic control and/or F.I. issue.
_________________
John & Cathy

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

whyoldbill · Posted: Fri Aug 07, 2009 6:30 pm Post subject:

You might want to check those TB fittings for air leaks, especially those little rubber caps that cover the vacuum nipples.
Can you reproduce the surge with the bike on the centerstand??

just my $.02 worth Wink

_________________
'02 - GL1800

The desired effect is what you get when you improve your interplanetary funksmanship - George Clinton

SugarHillCTD · Posted: Fri Aug 07, 2009 7:50 pm Post subject: