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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: Devil K on June 10, 2016, 05:08:54 PM

Title: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Devil K on June 10, 2016, 05:08:54 PM

Do you guys think it's possible to transplant a k100 motor into a k75 and if so is there a difference in their transmissions, drive shaft, and final drives?

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Martin on June 10, 2016, 05:20:51 PM

Front down tubes are different, probably cheaper to buy a K100 and sell the K75. Transmission drive shaft and final drive ( different ratio ) will fit.
Regards Martin.

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: K1300S on June 10, 2016, 07:24:27 PM

Nor will the 4cyl fit under the S bodywork....

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Martin on June 10, 2016, 10:04:38 PM

 Marshall about 12 years ago there was a guy in the BMWMCQ who did fit K75s fairing to a K100 minus the belly pan. I have looked for pictures on their website but have been unable to find them.
Regards Martin.

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: K1300S on June 10, 2016, 10:25:18 PM

That is only part of the package.   No complete S fairing. ...it doesn't count!

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Martin on June 10, 2016, 10:34:45 PM

Does so, some K75s did not come with a belly pan, it was originally optional, so there. Nana nana nah nah. :neener:
Regards Martin

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Martin on June 10, 2016, 11:44:23 PM

Marshall just for you I finally found a picture of the K100s and it had a belly pan.
Regards Martin.

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: jakgieger on June 11, 2016, 08:00:22 AM

K100 belly pan... :bmwsmile like on my avatar

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Devil K on June 11, 2016, 02:43:34 PM

So my question is, is there anyone out there who could give me advice on the motor swap. And you are saying that it is possible?

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: johnny on June 11, 2016, 02:46:45 PM

greetings devil k...

it is possible with the right shop equipment... plasma cutter... tig welder... tube bender... frame table and so forth...

j o

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Martin on June 11, 2016, 04:51:02 PM

+1 Johnny but anything  is possible, but it will require modifying the frame, a procedure that should be done by experienced persons.
Martin.

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: bmwrn on February 13, 2017, 07:52:21 PM

  I think that the K75RT frame is a K100 frame. The radiator shroud from a K100 bolts on to a stripped RT. I understood that the K75 RT was built on the K100 frame to save reengineering the K75RT.
  I d[size=78%]on't have a reference for this, only my experience with my stripped RT :2thumbup: [/size]

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Chaos on February 13, 2017, 08:15:15 PM

I bet a 3 cylinder turbo diesel from a smart car would fit.

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Martin on February 13, 2017, 10:29:40 PM

bmwrn definitely different front down tubes between a K75 and a K100.
Regards Martin.

Title: Re: Engine swap K75S 740cc trade for a 987cc from a k100
Post by: Dennis de Vries on February 14, 2017, 01:27:46 AM

As mentioned a few times now, the downtubes are different as the k75 lump is one pot short but you are welcome to prove us wrong. You are right on the k75rt running a k100 rad but that has been done to prevent it from overheating when touring fully loaded 2 up in a hot environment... Bit overkill if you ask me...

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