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Author Topic: K75 port & polish heads  (Read 1972 times)

Offline sci

  • Motobrick Curious
  • Posts: 45
K75 port & polish heads
« on: January 19, 2021, 03:30:47 PM »
Out on a ride last year I ran into a guy that said he had a 1993 K75 just like mine. Among other things, he said he did a port & polish on it and it made such a huge difference that the front end would come up off the ground. I have no plan on doing this because I don't need any more horses but I was wondering; was this guy pulling my leg? What do you guys think? Would it make that much difference in horsepower?
-Sci
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  • Battle Creek, Nebraska
  • 93 K75

Offline The Mighty Gryphon

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  • ^ Quintessential Motobricker
  • Posts: 6658
Re: K75 port & polish heads
« Reply #1 on: January 19, 2021, 04:23:18 PM »
There is a video on YouTube showing a K75RT doing wheelies so I suppose it's possible.



Who knows?  The guy in the video may be the guy who you were talking to.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Martin

  • ^ Quintessential Motobricker
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Re: K75 port & polish heads
« Reply #2 on: January 19, 2021, 04:40:31 PM »
It's got a lot to do with technique. I had a mate that could get just about anything up, including a Honda 90 Postie bike. I've accidently got my front to lift a couple of times when I first got it, but from a standing start. There is a school that you can attend. http://wheeliezone.com.au/
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline alabrew

  • ^ Proficient Motobricker
  • Posts: 280
Re: K75 port & polish heads
« Reply #3 on: January 20, 2021, 12:14:41 PM »
I popped a wheelie, once, just once, accidentally, with my young son on the back of the '85 k100RT.
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  • Birmingham, Alabama
  • 1985 K100, 1991 K100RS
Also:
2005 K1200LT
1979 R65
200,000 miles on BMW motorcycles

Offline schrocketeer

  • ^ Proficient Motobricker
  • Posts: 121
Re: K75 port & polish heads
« Reply #4 on: January 21, 2021, 09:54:17 AM »
Wheelie discussion aside, has anyone done any exhaust port cleaning / matching exhaust pipes to head type work?
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  • North Alabama
  • 1985 K100RT (P.O. mod'ed)
Ken   Current: 85 K100RS Turbo, 07 SV1000S, 80 KL250, 99 R1100GS, 09 DL650, 16 4RT260, 97 XR100, 70 CT70, 06 YFM400
Past Bikes: 85 K100RT, 86 VFR700, 91 XR250, 95 VLX600, 86 TRX250, 02 GZ250, 83 Z50R, 78 ATC90, 86 XR250, 79 XR500, 72 AT1, 75 YZ360, 78 DT400, 75 DT125, 73 Trail 70

Offline The Mighty Gryphon

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  • Posts: 6658
Re: K75 port & polish heads
« Reply #5 on: January 21, 2021, 03:36:26 PM »
Quote from: schrocketeer on January 21, 2021, 09:54:17 AM
Wheelie discussion aside, has anyone done any exhaust port cleaning / matching exhaust pipes to head type work?

I'm kinda thinking some of you guys are riding the wrong bike.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"
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Offline sci

  • Motobrick Curious
  • Posts: 45
Re: K75 port & polish heads
« Reply #6 on: January 21, 2021, 05:09:11 PM »
Thanks schrocketeer,
You took the words right out of my mouth. Very curious if anyone has done this?
-Sci
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  • Battle Creek, Nebraska
  • 93 K75

Offline Laitch

  • Faster than a speeding pullet
  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 10217
Re: K75 port & polish heads
« Reply #7 on: January 21, 2021, 05:20:20 PM »
Quote from: schrocketeer on January 21, 2021, 09:54:17 AM
. . . has anyone done any exhaust port cleaning / matching exhaust pipes to head type work?
Look here. They've been doing it for a while and they aren't keeping it a secret.  :laughing4-giggles:
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles
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