Author Topic: Cobra motor disassembly and rebuild  (Read 107765 times)

0 Members and 2 Guests are viewing this topic.

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,610
  • Bike almost back to the 70's 2015
Re: Cobra motor disassembly and rebuild
« Reply #600 on: September 10, 2016, 01:17:57 PM »
Mike, sorry about your loss.
My father left when he was 89 late november 2014, mother mars 2016 also 89 years old. I hope I'll be old like them:-) There are things to take care of when this happens.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Retro Rocket

  • Eggs are hard due too a
  • Really Old Timer ...
  • *******
  • Posts: 19,279
  • ROCK & ROLL
Re: Cobra motor disassembly and rebuild
« Reply #601 on: September 10, 2016, 03:46:48 PM »
That's good news. Jack coming?
We'll see Bill. Jack will be up this week for my father's wake and funeral. He passed away this past Thursday after a relatively short illness.

My sincerest condolences Mike.....
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Old Scrambler

  • My CB750K3 has been in 39 States & 5 Provinces
  • Old Timer
  • ******
  • Posts: 3,810
Re: Cobra motor disassembly and rebuild
« Reply #602 on: September 10, 2016, 04:59:52 PM »
Mike, my condolences to you and your family. You can take some small comfort in knowing we all reflect the special influences of our parents.
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
'63 CL72 Project(s)
'66 CL77 Red
'67 Triumph T100C
'73 750K3 Owned since New
'77 750F2 Cafe Project
2020 ROYAL ENFIELD Himalayan

Offline bear

  • Vale Bill McIntosh ......"illegitimi non carborundum"
  • Old Timer
  • ******
  • Posts: 2,575
  • Leeton in Australia
Re: Cobra motor disassembly and rebuild
« Reply #603 on: September 10, 2016, 06:51:13 PM »
I'm sorry for your loss Mike.
The older I get the faster I was.

Offline MRieck

  • Really Old Timer ...
  • *******
  • Posts: 10,566
  • Big ideas....
Re: Cobra motor disassembly and rebuild
« Reply #604 on: September 11, 2016, 09:49:23 AM »
Thank you gentlemen. My family and I truly appreciate the thoughts and prayers. Here is a link to my dad's obituary.....if you have a second read it because I think you'll enjoy some of it.   http://www.wrwatsonfuneralhome.com/obits.php?id=1371
Owner of the "Million Dollar CB"

Offline Tintop

  • Old Timer
  • ******
  • Posts: 3,965
Re: Cobra motor disassembly and rebuild
« Reply #605 on: September 11, 2016, 02:10:15 PM »
Condolences to you and your family Mike.  It would seem your mechanical talents are hereditary.
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline NickO

  • Enthusiast
  • **
  • Posts: 188
Re: Cobra motor disassembly and rebuild
« Reply #606 on: September 11, 2016, 02:28:23 PM »
Sincere condolences Mike.

Offline bwaller

  • Really Old Timer ...
  • *******
  • Posts: 7,485
Re: Cobra motor disassembly and rebuild
« Reply #607 on: September 11, 2016, 04:22:48 PM »
Mike my family & I send along our sincerest condolences. Knowing what I do about your character, it's safe to say your dad was a cool guy. Sorry for your loss.

Offline dragracer

  • Really Old Timer ...
  • *******
  • Posts: 5,123
  • CB750F Dragbike
Re: Cobra motor disassembly and rebuild
« Reply #608 on: September 11, 2016, 04:28:58 PM »
Thanks for sharing that with us.

Offline Fastbike

  • Full Member
  • *
  • Posts: 75
Re: Cobra motor disassembly and rebuild
« Reply #609 on: September 11, 2016, 05:15:09 PM »
Sorry for your loss, Mike.  My condolences.  Fathers are special people.
I'm not as smart as I look, but I am pretty.

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cobra motor disassembly and rebuild
« Reply #610 on: November 16, 2016, 09:05:46 PM »
LMAO,  you can change 1/2 a ring by pulling clutch, and the primary drive link. ..wow!
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,058
  • I refuse...
Re: Cobra motor disassembly and rebuild
« Reply #611 on: November 16, 2016, 09:10:08 PM »
Geez, Bill. Don't you have enough to do without tearing up your motor???
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline dragracer

  • Really Old Timer ...
  • *******
  • Posts: 5,123
  • CB750F Dragbike
Re: Cobra motor disassembly and rebuild
« Reply #612 on: November 17, 2016, 12:16:50 AM »
Pull the oil pan and you'll find the rest---- bottom end failure

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cobra motor disassembly and rebuild
« Reply #613 on: November 17, 2016, 03:54:02 AM »
Yep, it's next.
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline MRieck

  • Really Old Timer ...
  • *******
  • Posts: 10,566
  • Big ideas....
Re: Cobra motor disassembly and rebuild
« Reply #614 on: November 17, 2016, 04:54:13 AM »
LMAO,  you can change 1/2 a ring by pulling clutch, and the primary drive link. ..wow!
What head is sitting on that engine?
Owner of the "Million Dollar CB"

Offline Medyo Bastos

  • Master
  • *****
  • Posts: 1,591
  • Gusto mo titi ko?
    • project
Re: Cobra motor disassembly and rebuild
« Reply #615 on: November 17, 2016, 05:04:51 AM »
billy, you going to hang that engine on the wall downstairs?

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,610
  • Bike almost back to the 70's 2015
Re: Cobra motor disassembly and rebuild
« Reply #616 on: November 17, 2016, 06:09:33 AM »
Photos when cases are opened?
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cobra motor disassembly and rebuild
« Reply #617 on: November 17, 2016, 06:24:40 AM »
The Butch Pace bad temper one! Ex guide is fine ,pulled pipe. Life has been a zoo since I got home. Cylinder wasn't cracked in early pics!
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cobra motor disassembly and rebuild
« Reply #618 on: November 17, 2016, 06:27:24 AM »
Hell yes,  I got nothing to hide. ....it was built right. Mike, no more old pistons for me...no matter who's they are, lol.
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cobra motor disassembly and rebuild
« Reply #619 on: November 17, 2016, 09:31:47 AM »
Got two slightly used German primary chains, 25 passes est.
Other 125 MPH pieces included!
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline BPellerine

  • Master
  • *****
  • Posts: 2,222
Re: Cobra motor disassembly and rebuild
« Reply #620 on: November 17, 2016, 09:33:48 AM »
jeez bill,holes everywhere,you are a determined man!glad you ok,billp
1978 CB 750K ard and webers
another anfob

Offline knowsnothing

  • Hot Shot
  • ***
  • Posts: 643
Re: Cobra motor disassembly and rebuild
« Reply #621 on: November 17, 2016, 09:34:11 AM »
....... :o  :'(  ......sorry Bill
1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline madmtnmotors

  • When did I get to be a
  • Really Old Timer ...
  • *******
  • Posts: 6,110
  • Sunny Central Florida
Re: Cobra motor disassembly and rebuild
« Reply #622 on: November 17, 2016, 09:57:17 AM »
Looks like more of the piston in there. Make sure not to lose any of the pieces!
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 Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cobra motor disassembly and rebuild
« Reply #623 on: November 17, 2016, 09:58:59 AM »
It's ok, cause I'm ok, thank God! Won't be repeating this one....Engine noise is Engine noise! My bad. Jim, get the welder fired up! LMAO, Bill  Oh, Scottly. ...buttons,  I'm getting old,  lol. Looks like light weight pin broke!
« Last Edit: November 17, 2016, 10:08:55 AM by Bill/BentON Racing »
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE

Offline kmb69

  • Master
  • *****
  • Posts: 2,041
Re: Cobra motor disassembly and rebuild
« Reply #624 on: November 17, 2016, 10:13:09 AM »
That's some real carnage there!  :(  :(  :(