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Author Topic: 88 K100LT Random Misfire Suddenly Worse  (Read 22912 times)

Offline Edb100cafe

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88 K100LT Random Misfire Suddenly Worse
« on: May 19, 2016, 09:59:08 PM »
Hello All,

I'm having an issue with my K100, that after searching, I couldn't find another post with similar symptoms. This is only my second day of riding the bike, although I bought it this winter and did some modifications as well as yard riding. First day out I rode it for 20 minutes round trip, bike started right up, seemed a little rich, but had no misfire to speak of. Today I took it out, maybe 15 minutes into the ride, the bike started misfiring badly. When I let off the gas the engine died, would not restart. I gave it a little throttle while cranking and the bike started but was still misfiring badly. I was only 2 minutes from a friends house so I nursed it there. In a quick investigation I found spark on all cyls, good spray from all injectors. Also found all 4 plugs to be fouled. Will look into it more tomorrow but was curious to see if anyone has had similar issues. Any help is greatly appreciated.
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  • 88 K100LT

Offline TrueAce

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #1 on: May 19, 2016, 10:02:25 PM »
And just how old is the gas in the tank? Was the tank full with fresh gas and a pint of stabilizer when stored? Try fresh gas and report back.
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Offline TrueAce

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #2 on: May 19, 2016, 10:05:30 PM »
BTW clean cafe........but get out your Dremel and lose the tank holes right & left. Beyond fresh gas, check the fuel pump function.
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Offline Edb100cafe

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #3 on: May 19, 2016, 10:32:00 PM »
Thanks. Gas tank was filled today with 93. Friend filled up at the same time and had no issues so I am ruling out bad gas.
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Offline mystic red

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #4 on: May 20, 2016, 02:10:42 AM »
I would look at air intake issues. Check the bushings by the injectors with propane.  (Sounds dangerous but actually safer than started fluid).  That rubber can crack suddenly and give the problems you describe.
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Offline Edb100cafe

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #5 on: May 20, 2016, 06:23:48 AM »
Thanks, Ill check it out
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Offline johnny

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #6 on: May 20, 2016, 06:48:25 AM »
greetings edb100cafe...

your cafe moto needs fork gaiters to be taken seriously here at motobrick.com...

j o

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Offline Laitch

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #7 on: May 20, 2016, 07:11:13 AM »
Quote from: Edb100cafe on May 19, 2016, 09:59:08 PM
I'm having an issue with my K100, that after searching, I couldn't find another post with similar symptoms.
Right. :laughing-on-ground:

Following on from Mystic Red's suggestion, also pull the fecking airbox, clean the box of mice, gazelle and road deposits, clean the filter, check all hoses large or small, check the vacuum caps on the throttle bodies for integrity, then report back.  Don't forget the installing of fork gaiters, too.
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Offline Edb100cafe

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #8 on: May 20, 2016, 07:32:42 AM »
Everything I came up with had some similar symptoms but a few variables missing. Ill pull the intake and check it out, thanks. Gaiters are on the list
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Offline johnny

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #9 on: May 20, 2016, 07:47:07 AM »
gaiters come in colors now... donts gotts to be black... you can getts them in gray to match your battery...

j o
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Offline TimTyler

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #10 on: May 20, 2016, 08:52:56 AM »
So you searched motobrick.com for "rough idle" and couldn't find any similar problem threads?

Quote from: Edb100cafe on May 19, 2016, 10:32:00 PM
Thanks. Gas tank was filled today with 93. Friend filled up at the same time and had no issues so I am ruling out bad gas.

Doesn't matter. Pour a bottle of Seafoam or HEET in your tank and rule out water for sure.

It's probably an air leak though.
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Offline TrueAce

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #11 on: May 20, 2016, 10:02:17 AM »
Guess our inmates are interested in rebuilding your cafe while they solve your problem.............so let me join in..... you can get a 12 cell lithium,mount in in the battery box on it's side to lose the ugly big battery.
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Offline Laitch

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #12 on: May 20, 2016, 10:59:43 AM »
Quote from: TrueAce on May 20, 2016, 10:02:17 AM
so let me join in..... you can get a 12 cell lithium,mount in in the battery box on it's side to lose the ugly big battery.
Be advised though, doing that will attract dogs.
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  • Along the Ridley in Vermont.
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Offline jakgieger

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #13 on: May 20, 2016, 02:52:00 PM »
http://www.amazon.com/Rancho-RS1952-Shock-Boot/dp/B000CPCCFY?ie=UTF8&colid=23Z9PYKMM8YT7&coliid=I2P5KZWKKZA24K&ref_=wl_it_dp_o_pC_nS_ttl

Good cheap gaiters w/chaos's 5 star approval  :bmwsmile

"Be advised though, doing that will attract dogs."  Laitch, when did you go from helping people to giving fecked up opinions? :bmwsmile
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  • Kansas USA
  • 1989 K100rs se
"What we've got here is failure, to communicate.  Some men, you just cain't reach.  So you get what we had here last week.  Which is the way he wants it...Well, he gets it.  I don't like it any more than you men do."

Offline johnny

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #14 on: May 20, 2016, 03:43:27 PM »
fouled plugs... now new plugs... same thing...

wondering if your new plugs have the nipple and if the wires are on there properly...

j o
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Offline BAMBAM1039

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #15 on: May 20, 2016, 03:50:00 PM »
just had a friend start his bike for first time this year and have similar problem  drove to my work and i discovered he had been driving around with chock on  i know its a shot in the dark and sounds strange but its has happened before  good luck  you are correct my mistake totally forgot bricks are all injected sorry
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Offline The Dude

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #16 on: May 20, 2016, 04:11:03 PM »
Quote from: BAMBAM1039 on May 20, 2016, 03:50:00 PM
just had a friend start his bike for first time this year and have similar problem  drove to my work and i discovered he had been driving around with chock on  i know its a shot in the dark
Yep,Bricks don't have choks,or chokes...they have cold start idle speed raising levers.
Hmmm. fouled plugs...running rich...dies when hot....
Either the air's not getting in (enough)or the brain thinks the air's not getting in.(maybe?)
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Offline Martin

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #17 on: May 20, 2016, 04:23:18 PM »
Possibly  faulty temperature sensor check the post on how to test.
Regards Martin.
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Offline Laitch

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #18 on: May 20, 2016, 05:01:48 PM »
Quote from: jackgeiger on May 20, 2016, 02:52:00 PM
"Be advised though, doing that will attract dogs."  Laitch, when did you go from helping people to giving fecked up opinions?
It wasn't meant as an opinion, Jack, but rather as a heart-felt warning. I deduced such an outcome by observing Ace's avatar photo as I read his battery advice. I just don't want anyone bitten who doesn't actually deserve it. I care too much.
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Offline jakgieger

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #19 on: May 20, 2016, 05:13:16 PM »
Quote from: Laitch on May 20, 2016, 05:01:48 PM
Quote from: jackgeiger on May 20, 2016, 02:52:00 PM
"Be advised though, doing that will attract dogs."  Laitch, when did you go from helping people to giving fecked up opinions?
It wasn't meant as an opinion, Jack, but rather as a heart-felt warning. I deduced such an outcome by observing Ace's avatar photo as I read his battery advice. I just don't want anyone bitten who doesn't actually deserve it. I care too much.
:threadjacked  Sorry, Laitch...you have the sharpest eyes, a dry new england wit, and the greatest attention to detail on this forum.  I missed your reference AND Trueace's new signature :hehehe  Now the remark about needing bit might be slightly fecked up...
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  • Kansas USA
  • 1989 K100rs se
"What we've got here is failure, to communicate.  Some men, you just cain't reach.  So you get what we had here last week.  Which is the way he wants it...Well, he gets it.  I don't like it any more than you men do."

Offline TrueAce

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #20 on: May 20, 2016, 06:27:36 PM »
JackGeiger, since you aren't noticing things, allow me to notice that if Laitch says "because I care", put your hand over your wallet. And by the way, better get that jackass picture in your avatar, cause apparently the HC is on a Love Animals" jag again, who knows how long this will last. Bet he's feeling bad about running over the neighbor widow's cat when I was up there riding with him .
EVERYBODY PAY ATTENTION :mbird IT's LOVE ANIMALS, PEOPLE. POST THOSE AVATARS! :2thumbup:
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Offline jakgieger

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #21 on: May 20, 2016, 08:02:29 PM »
If this keeps up I'm gonna get a depends from Bob Dole :bmwsmile
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  • Kansas USA
  • 1989 K100rs se
"What we've got here is failure, to communicate.  Some men, you just cain't reach.  So you get what we had here last week.  Which is the way he wants it...Well, he gets it.  I don't like it any more than you men do."

Offline Edb100cafe

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #22 on: May 21, 2016, 06:55:52 PM »
Little update. Checked the resistances on the MAF, IAT, water temp and all came back within spec. Added some Heet just as a precaution. Cleaned EFI connector and replaced plugs with D7EA. Also inspected injectors for any leaks, all hold. Replaced a cracked line from the tank to FPR. Next up is checking the fuel pressure. Bike is dumping fuel at all times it seems. Will not start with the fuel pump plugged in while cranking.
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Offline Martin

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #23 on: May 21, 2016, 07:01:02 PM »
When you say will not start, is it flooding. And if so will it start with the fuel pump fuse removed ( Kraffstoppe # 6 ).
Regards Martin.
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Offline Edb100cafe

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Re: 88 K100LT Random Misfire Suddenly Worse
« Reply #24 on: May 21, 2016, 07:38:36 PM »
I have been unplugging the 4 pin plug for the pump/sending unit. But yes it floods. I can get it started with the pump unplugged and cracking the trottle.
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