die out from lite,bucking while cruising

[racinrich]

k1100 1993 died on left turn in first gear this am 15 minutes into ride restarted ok
have noticed 2 times at speed 45 mph steasdy state throttle ,stumble run,die run die run die back ok
1 time started cold(summer cold) idle rough and no response from throttle then it responded
fuel pump new
battery new
new plugs
107k miles, any ideas ,what do the engine controllers do before they quit
side question  any way to get bike to start in gear with clutch pulled in,I E shifter switch override,
the way I ride I can't have intermittent stalling ,thanks

[frankenduck]

Usual suspects:

Check, clean (steel wool works well) and tighten the ground connections on the left side of the transmission near the shift lever.  Check, clean and tighten the battery terminal connections.  Also check the wiring connections for the ignition coils. Each has a two lead clip-in connector and a ground wire with a ring terminal on it.

Make sure the wiring harness connector for the Motronic is well-seated.

Make sure that all of your fuses are well-seated.

With those miles it may also be your ignition switch is starting to fail and needs to be cleaned/replaced.

Also, since it's a 93, look at the bottom of the first post at this link for instructions on how to refresh the heat sink compound on the back of your ignition amp.

[racinrich]

grounds were tite ,clutch new. seems to be worse tonite,got 3 blocks from work died ,runs like on one coil pak on accel starts and idles sounds smooth,crank on throttle  may get 1500 sounds like 2 cylinders ,wiggled coil wires primary nothing,let cool a few minutes got back to shop and ran on centerstand pulled rt side panel disconnected a few connectors while running ,2 wire yellow green dies  right out .after reconnect seemed to to not die while running.do not have engine wiring

[robleyd]

In the Lieberry you'll find http://www.motobrick.com/index.php/topic,2043.msg10762.html for wiring diagrams

[racinrich]

no hall effect, ignition amp,or primary ignition coil wiring shown, is this wiring shown in clymers manual?

[frankenduck]

You really need to redo the heat sink compound on the ignition amp.  It's there for a reason.  I'll bet it's never been done on your bike.

The K1 I bought last year didn't run great when it got hot.  Redid the heat sink compound and it runs like a top.

I spent HOURS on the phone with some dude from LA last spring.  I kept telling him to redo the heat sink compound.  He swapped Motorincs and a bunch of sensors and other crap but what cured his rough running 93 LT was redoing the heat sink compound on the ignition amp.

I didn't recommend that for my own entertainment. I recommended it because it usually works to cure rough running 93 and earlier 4V bikes. I think chasing wires without doing that first is an exercise in futility.

[racinrich]

I will do this first,the fact that it failed less than 2 minutes after start up today seems like a component failure ,all rides previous have been 1.5 to 2 hours without missing a beat.I am not doubting your experience.the first die out I did not know what failed ,when I left tonite I could tell ignition system was rite section to further diagnose.I am a tech by trade and do not blanket repair. I'll email you when I need parts,thanks for all your help

[frankenduck]

Sorry, just thought you were ignoring it so wanted to put a little emphasis on it.

If it's a wiring or component failure then sometimes those take a little trail and error to resolve.

[racinrich]

pulled the primary connectors off coil 1 and 2 found light corrosion in terminals,cleaned out and reconnected,test drove 40 miles and got bike hot.has not stumbled or died since,tuesday it would not run more than 5 minutes without acting up.Am going to go thru ALL connectors this weekend and redo amp heatsink grease ,found some at radio shack,thanks all for the input.One can't buy the wealth of knowledge offered up .just hope I can help out the same way :mbird