« previous next »
Pages: 1 [2]  All   Go Down

Author Topic: Restoration Service?  (Read 2297 times)

0 Members and 1 Guest are viewing this topic.

Offline chiefum

  • Enthusiast
  • **
  • Posts: 235
Re: Restoration Service?
« Reply #25 on: August 04, 2020, 06:32:58 AM »
I sent out my 750 tank to have Steve clean and line it. It turned out great and he had great communication. That's where I'd take my bike if I didn't feel confident doing it myself.
Logged

Offline maxheadflow

  • Hot Shot
  • ***
  • Posts: 579
Re: Restoration Service?
« Reply #26 on: August 04, 2020, 07:37:45 AM »
Quote from: scottly on August 03, 2020, 08:03:34 PM
Quote from: maxheadflow on August 03, 2020, 07:09:41 PM

Well at 160K they guy was probably tossing in a little fork oil or ATF to keep the seals and tower plugs soft. 
No, he wasn't. :P My top end was last apart in 1979, and the seals and cam tower pucks don't leak. ;)

Back in the day, CB750s didn't leak that much. What got em was sitting in traffic. get em hot and the rubber gets hard and shrinks.  The smaller 4s seemed to leak more.  Some of it was like do to them being ruin harder.  The camshaft feed location also had something to do with it. Knew a couple guys with over 100K on their 750s.
Logged

Offline samfig

  • Sr. Fig
  • Enthusiast
  • **
  • Posts: 154
Re: Restoration Service?
« Reply #27 on: August 05, 2020, 06:55:35 AM »
Quote from: madmtnmotors on August 04, 2020, 04:07:59 AM
Quote from: samfig on August 03, 2020, 07:56:58 PM
The immediate work would have to be what's pictured below and the two exhaust pipes that are turning to swiss cheese.
I'm not sure what it would cost to change that seal, but what time would it take?  How involved would the work be?  I feel confident in doing the work with time and patience, but one of those is precisely what I don't have.

Is that exhaust soot on the cylinders? If so, replacing exhaust pipes and exhaust gaskets is pretty straightforward.

I don't think it's exhaust soot but rather a seal.  Do these pictures help?
Logged
-1973 CB750

Offline madmtnmotors

  • When did I get to be a
  • Really Old Timer ...
  • *******
  • Posts: 6,140
  • Sunny Central Florida
Re: Restoration Service?
« Reply #28 on: August 05, 2020, 07:48:34 AM »
Oh yeah, that definitely looks like oil. I would probably want to address that if it were mine. Minor weeping can be cleaned off after each ride but that looks like it might be hard to keep ahead of. Have you cleaned it to see how long it takes for the leak to spread/accumulate?
Logged
TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline samfig

  • Sr. Fig
  • Enthusiast
  • **
  • Posts: 154
Re: Restoration Service?
« Reply #29 on: August 05, 2020, 09:03:08 AM »
Quote from: madmtnmotors on August 05, 2020, 07:48:34 AM
Oh yeah, that definitely looks like oil. I would probably want to address that if it were mine. Minor weeping can be cleaned off after each ride but that looks like it might be hard to keep ahead of. Have you cleaned it to see how long it takes for the leak to spread/accumulate?

I haven't cleaned it since last year so once I get the brakes back on it I'll give it a good wash and see what's up.

Another twist to this plot, though.  The wife said I should just buy a new exhaust and then slowly work on the bike.  I informed her what reproduction 4 into 4s cost and she didn't mind.   ::)

I contacted Hoy via his website and I'll let you all know what comes of that (thanks for passing along his information).
Logged
-1973 CB750
Pages: 1 [2]  All   Go Up
« previous next »