Author Topic: Oil Leak on number 3 cylinder head at the exhaust pipe connection  (Read 27792 times)

Offline riots100

  • ^ Proficient Motobricker
  • Posts: 167
Re: Oil Leak on number 3 cylinder head at the exhaust pipe connection
« Reply #25 on: October 03, 2016, 04:35:01 PM »
Appears a good prevention is to replace or check the fuel pressure regulator.

Or at least check to see if fuel is returning to the cylinder from the FPR through that vacuum line.
  • Los Angeles, CA
  • 1992 K75, 2007 K1200GT, 1991 K100RS
----
BDJ

Offline Motorhobo

  • +25 years of K75
  • ^ Quintessential Motobricker
  • Posts: 1530
Re: Oil Leak on number 3 cylinder head at the exhaust pipe connection
« Reply #26 on: October 04, 2016, 06:26:44 AM »
Amazing -- 99% of people on the planet would have ridden it till it died, put in a new engine and only then figured out it was the FPR.

What did you do with the rest of the engine you purchased to scavenge the rod from? And forgive me for asking but why didn't you just use that 30k engine rather than take it apart to fix the old one? The only answer I can come up with is that, as the guy in Dirty Harry said as Clint Eastwood was about to shoot him I in the face, "I gots to know!"...

No disrespect intended -- I have nothing but admiration for your mechanical prowess and tenacity.
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline riots100

  • ^ Proficient Motobricker
  • Posts: 167
Re: Oil Leak on number 3 cylinder head at the exhaust pipe connection
« Reply #27 on: October 04, 2016, 12:35:02 PM »
No disrespect intended --

Al Contrario,  thank you, and thank you all for your kind words.

I probably should have made it clearer, I only bought the connecting rods and pistons on ebay.  They came from a parted out motor.  I did not buy the entire motor.

Although I did consider doing so.  But as old as the bike was and aforementioned condition, it only had 12,000 miles on the clock.  So I elected to keep as many original parts as I could and only replace those that needed it.

Here's a screen shot from the eBay listing.  I bought three connecting rods/pistons.  I only used one connecting rod, bearing insert and connecting pin.  The rest are sitting in a box, on shelf in my garage.

  • Los Angeles, CA
  • 1992 K75, 2007 K1200GT, 1991 K100RS
----
BDJ

Offline YoungEngineer

  • ^ Motobrick Curious
  • Posts: 109
Re: Oil Leak on number 3 cylinder head at the exhaust pipe connection
« Reply #28 on: October 19, 2016, 06:00:15 AM »
I have a very similar issue. Oil from piston 3 and compression loss. Time to check the FPR. Hopefully no damage to the rods!
Thanks for the awesome writeup.
  • London
  • K1100LT

Offline Inge K.

  • ^ Quintessential Motobricker
  • Posts: 1451
Re: Oil Leak on number 3 cylinder head at the exhaust pipe connection
« Reply #29 on: October 19, 2016, 11:03:40 AM »
I have a very similar issue. Time to check the FPR.

Your model don't have a vacum connection on the FPR.
  • Norway

Offline YoungEngineer

  • ^ Motobrick Curious
  • Posts: 109
Re: Oil Leak on number 3 cylinder head at the exhaust pipe connection
« Reply #30 on: October 19, 2016, 11:33:43 AM »
Thanks for the heads up.
  • London
  • K1100LT

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