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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: fastxl on March 10, 2022, 09:32:50 PM

Title: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: fastxl on March 10, 2022, 09:32:50 PM
Doing a bit of work to an 88 K75S I inherited. New Fuel injectors, Intake Manifolds, Fuel Pump, Spark Plugs, All the stuff to get it running good.

What is this Plug? Battery Charger?

I found this line that is plugged. What is if for? Looks like it goes the crankcase.

Is it normal to use 2 different brand and part number spark plugs??? (This is sarcasm, I know better but apparently someone didn't)


Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: frankenduck on March 10, 2022, 09:50:47 PM
The photos you attached don't work.
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: Chaos on March 10, 2022, 10:09:29 PM
not sure about the wire, the vac line was a fuel tank vent that vented into the crankcase (I think, might be wrong) but it was a bad idea and most bikes had it plugged so they would run right.  As for the oddball plug, it happens :laughing4-giggles:
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: fastxl on March 10, 2022, 10:12:33 PM
Thanks for sorting out the pics. I think the plug/wire might be for some sort of battery trickle charger?
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: Chaos on March 10, 2022, 11:16:10 PM
it sort of looks like a broken plunger switch for the brake light, but those are next to the hand lever or foot pedal. 
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: frankenduck on March 10, 2022, 11:55:56 PM
Quote from: fastxl on March 10, 2022, 09:32:50 PM
I found this line that is plugged. What is if for? Looks like it goes the crankcase.

Mystery hose: http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/mysteryhose/mysteryhose.htm
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: fastxl on March 11, 2022, 07:11:17 AM
The mystery plug is attached to the plastic cover that covers the coils. To me it looks like a cig lighter only smaller, it even had a flip up cover on it like a cig lighter in car. I don't even see on the wire diagram in the repair manual I have.
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: Laitch on March 11, 2022, 07:18:39 AM
Quote from: fastxl on March 11, 2022, 07:11:17 AM
The mystery plug is attached to the plastic cover that covers the coils.
It's an accessory power socket, so your impression of it is correct. I receives a BMW-style plug and can be used for heated gear or other accessories.
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: Laitch on March 11, 2022, 07:24:14 AM
This is an image of a BMW plug to SAE plug adaptor. The BMW plug is on the right; the SAE is on the left.
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: The Mighty Gryphon on March 11, 2022, 08:12:56 AM
That outlet that was on the coil cover is a broken accessory socket. 

The plugged hose goes to a small hose barb on the top of the engine block near at the front of the engine near the coolant temperature sender.  It was part of the California air quality requirements that was later disabled.
Title: Re: 88 K75S Few questions, Spark Plugs, Wire Plug and Mystery Vac Line
Post by: frankenduck on March 11, 2022, 01:13:46 PM
The "BMW" power socket uses a Powerlet or Hella plug.  It's connected to the battery so, in addition to being used for output to heated gear or whatever accessory, it can also be used to keep the battery charged with a trickle charger.