K11 Owners Group

Kipp K11RS · Joined: 23 Feb 2006 Posts: 17 Location: Honeoye Falls, NY

I replaced my Stock Exhaust on my 93RS is a Staintune exhaust, and now I get an occasional sneeze and more rare occasional backfire pop Shocked

on deceleration. It seems mostly to happen when engine is on the colder side. Is there an adjustment I can make to fix this?
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Kipp
'94 K1100RS
Honeoye Falls, NY

Off the grid · Posted: Tue Jun 17, 2008 10:02 pm Post subject:

Do nothing, that's normal.
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Bane of your existence since July 2006
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Jim · Posted: Tue Jun 17, 2008 11:29 pm Post subject: sneeze and pop

Kipp - you can check the TPS. I don't know how much different it is on the K11's and K75's - backfiring was a common problem on the 75's - adjusting the TPS slightly off from spec would fix it. I have a Remus - it pops some, but doesn't out and out backfire like the 75 did - it backfired like a truck!
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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."

Flying Duck · Posted: Wed Jun 18, 2008 12:04 am Post subject:

On 2 valve Ks it's a switch. On four valves it's a potentiometer.

And a K75 will still backfire under the right circumstances even with the TPS adjusted properly.
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Jim · Posted: Wed Jun 18, 2008 12:52 am Post subject:

That's what I said - the 75 would backfire like a big truck unless the TPS was set slightly off spec.
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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."

Flying Duck · Posted: Wed Jun 18, 2008 1:27 am Post subject:

CheapJapCopy · Posted: Wed Jun 18, 2008 2:43 am Post subject:

Mine was making some lovely pops and bangs before I welded up the exhaust..
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1992 K1100RS - Red and gold.

abreeze · Posted: Wed Jun 18, 2008 8:23 am Post subject:

the poping and back fireing is a engine running LEAN. makes sense as the new pipe is freeer flowing.

you could adjust the TPS very slightly to richen it up.....I have not tried it but in theory could work.....

btw...the 2V motor has a mass air flow so you can adjust the CO to richen the mixture.

Kipp K11RS · Joined: 23 Feb 2006 Posts: 17 Location: Honeoye Falls, NY

Thanks for the input, I am going to take it for a long week end of riding and then see if it is worth messing with. I don't quite get why popping would be from lean...I would think it would be from rich unburnt fuel igniting in the freer muffler...anyway I am a bit nervous about messing with the TPS...
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Kipp
'94 K1100RS
Honeoye Falls, NY