Author Topic: Stev-o's K4 "Big Bang Theory"!  (Read 34381 times)

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Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #175 on: March 20, 2018, 03:58:36 PM »




Thats a  damn fine looking 750!

Thanks PG


Stev-o,
Any chance it was slightly wet outside the two times it blew?  In other words, is it possible that moisture was getting to a wire that has a short and causing the fault and then no rain/moisture the last ride, so it didn't experience the problem?


Hey Ron...no, it was dry when I road the bike.  I havent yet checked all the wiring, it was Kawasaki's all last week!

'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Restoration Fan

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #176 on: March 21, 2018, 06:57:06 AM »
Yeah, then I'm going with the cal's theory that it was vibration causing a short to touch metal, too.

Ron
Ron

Stella - Logan's Senior Project    78 750K http://forums.sohc4.net/index.php?topic=141761.0

Logan's Reward - CB500 and CB550 Cafes    http://forums.sohc4.net/index.php/topic,147787.0.html

Offline MauiK3

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #177 on: March 21, 2018, 08:56:44 AM »
Since it happened after the engine went back in, maybe a wire from the alternator was stretched or pinched along the way. Or perhaps something associated with the starter.
Great looking bike, great color. Are there more photos of the finished product somewhere?
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #178 on: March 21, 2018, 03:40:45 PM »
Since it happened after the engine went back in, maybe a wire from the alternator was stretched or pinched along the way. Or perhaps something associated with the starter.
Great looking bike, great color. Are there more photos of the finished product somewhere?

Hey Steve....yes, I will check all the wiring.  Dont know how it could be associated with the starter, though?

A few more pics....





On a ride at "The Rock"...




At a camp trip/vintage bike show last October...







'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MauiK3

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #179 on: March 22, 2018, 08:40:32 AM »
Great shots.
Being here on Maui I do miss the diversity of the bike scenes on the mainland. Harleys and tupperware bikes (and other similar rides) reign. Nothing wrong with that but the general lack of variety can get boring.
Beautiful bikes.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #180 on: March 22, 2018, 02:45:03 PM »

Being here on Maui...


Sorry, but if you are looking for sympathy, you're in the wrong place!   You live in paradise and have an awesome bike, you know how many guys would kill for that?
Most of the bikes I see on a daily basis are not vintage, when I do spot one it catches my eye.
So it's not totally different here as far as the bike scene.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline seanbarney41

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #181 on: March 22, 2018, 05:20:35 PM »
Same here...pretty unlikely to see anything but Harley unless you are at a happening...like hanging with me and Ekpent.  Hell, most old bike guys I know rarely show up on their old bike..."but the goldwing is so comfortable"...really?
If it works good, it looks good...

Offline Terry in Australia

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #182 on: March 22, 2018, 11:28:54 PM »
Same same here, I'm convinced that the only people who really ride their bikes regularly are Harley owners. I'm out on the road most weekends on any one of my bikes and apart from the odd BMW rider, I hardly ever see another SOHC4, Z1, GS etc. Of course I ride a fair way from the city limits, so maybe the vintage bike posers are staying a little closer to home? I did see one mint looking CB750 on the highway on my way back to Canberra last year, but it was getting loaded onto a tow truck........... ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #183 on: March 23, 2018, 02:02:12 PM »
Same same here, I'm convinced that the only people who really ride their bikes regularly are Harley owners.

Not the case here, I think I see more sport bikes.  Seems the vintage bikes are not used for daily riders...
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Terry in Australia

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #184 on: March 23, 2018, 02:13:51 PM »
Yeah, I forgot sports bikes, I see a few hooligans on sports bikes on my daily commute into the city, and a heap of them flocking to Phillip Island for the Moto GP and Superbikes, but rarely see one out on country roads where I like to ride, it's mostly older guys like me on their Harley's. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #185 on: March 09, 2019, 12:10:46 PM »
Hey Guys....was a beautiful day yesterday [82*F] in Central Texas yesterday, cut out of work early and rolled the K4 out of the garage.

At the end of last season, the battery I had in it was not holding a charge, so about a month ago I installed a Scorpion AGM in it.   With winter here, hadnt ridden lately but was happy when the K4 cranked strongly and fired up after 20 seconds or so, always a good day when that happens!  Geared up and went for a nice hour long ride through the hills.  I've put just over 800 miles on the motor since the rebuild and could not be happier with the reliability and performance of it. It idles nicely and pulls strong when the controntrol is rotated!
BTW - I did end up finding the electrical gremlin - the bullet connector for the the front brake light switch had come "uninsulated" and would ground out occasionally.  I currently have it taped up but need to make a proper repair.




 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline budman

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #186 on: March 09, 2019, 03:17:25 PM »
Sounds like fun.  Y’all been getting much rain?  Everybody around here is sick of the rain.  Can hardly get any riding in.  People are starting to refer to Houston as Seattle.  I told my wife the other day that at the first sign of a decent weekend I’m heading to the Hill Country.
Bud

1973 CB750K3 Chopper
2021 Indian Scout

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #187 on: March 10, 2019, 07:20:03 AM »
Sounds like fun.  Y’all been getting much rain?

Hey Bud.....no, not much rain at all.  However, it is forecast for the next three days...
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #188 on: July 17, 2021, 11:30:34 AM »
Quick update, been nearly four years since the motor was rebuilt because of the hole blown in the case!

Still running great and I love riding it!


'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Online PeWe

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #189 on: July 17, 2021, 01:04:31 PM »
It look really good too! ;)
Nice deep shiny red color!
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 newday777

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #190 on: April 18, 2022, 02:56:46 AM »
Quick update, been nearly four years since the motor was rebuilt because of the hole blown in the case!

Still running great and I love riding it!




I just read through this old thread the past few days as I have a few projects I picked up a couple weeks ago. Good job on it Steve.
It's still cool up here in NH, my K5 is getting a tank derusting and itching to get it out for a ride and so my storage room is busting at the seams with the K5 and K6 in there with other junk.... so an expansion is underway, from 10'x11' to 11'×36', so I have room to work on my bikes. I'm about to tear down the 836 chopper motor I got in the purchase to give it a good inspection and clean up inside and out. After reading of the rod cap I'll be checking everything inside. It'll be going into my K6 that I set up new from the crate for my oldest brother and was sold to a friend of mine who rode it @10 years then parked it and the mice moved in.....
And yes, the red and black paint will be removed and back to aluminum silver for the sleeper look that will come alive.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline MauiK3

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #191 on: April 18, 2022, 07:57:19 AM »
The louvers on the side of that motor are a curious addition. I can't think of a reason for them other than boredom.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline newday777

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #192 on: April 18, 2022, 07:59:49 AM »
The louvers on the side of that motor are a curious addition. I can't think of a reason for them other than boredom.
Ya that motor was on a chopper. Lots of chrome.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #193 on: April 19, 2022, 07:28:07 AM »
Quick update, been nearly four years since the motor was rebuilt because of the hole blown in the case!

Still running great and I love riding it!




I just read through this old thread the past few days as I have a few projects I picked up a couple weeks ago. Good job on it Steve.

Thank you.  Cant believe it was 5 yrs ago!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Online PeWe

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #194 on: April 19, 2022, 11:56:30 AM »
Time flies away!
I remember the hole in the block and how it was turned to something good.

Good looking bike and nice deep red color. :)
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 Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #195 on: April 19, 2022, 01:13:01 PM »
I remember the hole in the block and how it was turned to something good.


Yes!

 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline newday777

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #196 on: April 19, 2022, 03:22:32 PM »
Yikes!
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #197 on: October 18, 2022, 12:46:02 PM »
Quick update:

Installed a new AGM battery and front BT46 tire this year, bike is running great and ready to go to the Harvest Classic Vintage Motorcycle Rally!




'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MauiK3

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #198 on: October 18, 2022, 02:49:34 PM »
Such a great looking CB750, great color!
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline SOHC4 Cafe Racer Fan

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #199 on: October 18, 2022, 04:20:22 PM »
Great looking bike, Steve!
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold