Author Topic: Stev-o's K4 "Big Bang Theory"!  (Read 34132 times)

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Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #125 on: August 07, 2017, 08:16:48 AM »
Cool!  Glad you got it running.  Maybe you can repop that left handed throttle lever and make a few bucks.

Thanks.      Ha....might run into patent issues on that throttle lever?!
'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 #126 on: August 08, 2017, 05:09:48 PM »
A little out of sequence, but lets wrap this sukka up!   

Found these old pipes in the Batcave and slapped em on!





Also found this body kit, bought it a couple years back from Chewy.  Put NOS badges and a petcock on it....






And about three months later, she is done!  I've put about 160 relatively easy miles [not over 6K RPM yet] and she is running good! 

However, I've blown the main fuse twice though, thats a new issue, never happened before.   Put a new fuse and off she went, but that concerns me a bit, must have a short somewhere but not a daily thing [I make sure I have a supply of fuses with me at all times!]


Here she is today at the local park....






...and how she looked on the day she blew!




Now I can concentrate on my Kaw H2 project, want that on the road by Oct 1.  Then a K1 is waitin' in the wings....

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

Online CycleRanger

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #127 on: August 08, 2017, 05:53:26 PM »
way to go!  Came out looking pretty damn nice.
Only three months... wish I could work that fast.
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
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Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #128 on: August 08, 2017, 05:58:03 PM »
way to go!  Came out looking pretty damn nice.
Only three months... wish I could work that fast.

Thanks Ranger.  Would have been quicker if I was playin' around with the Kawasaki & the little Suzuki. 
But, it's been so frikken hot in the shop, I don't tend to waste so time out there!
'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 #129 on: August 08, 2017, 06:32:15 PM »
Looking good, Steve.  Was the blue bad luck?
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Offline seanbarney41

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #130 on: August 08, 2017, 06:43:00 PM »
That looks awwreeeeal good...bettin' it runs to match.  Chewie hooked it up.  The blue was nice but gotta have that stripe...and them pipes.
If it works good, it looks good...

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #131 on: August 08, 2017, 07:07:21 PM »
Looking good, Steve.  Was the blue bad luck?

No, the blue was not bad luck, it ran well for years, Bud. (You saw it last Oct)



That looks awwreeeeal good...bettin' it runs to match.  Chewie hooked it up.  The blue was nice but gotta have that stripe...and them pipes.


Thanks Sean.  Ya know, I bought two sets of stripes for the blue tank, the painter screwed up one, I, the other.  After that I said Eff it for stripes.

 I'm thinking at least 300 "easy" miles, then an oil change and let er rip. 

I know some guys say break it in hard like your gonna run it, but this was a pricey rebuild and I don't wanna blow it up again this year!

What have you guys done for break in after a new top end?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline riverfever

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #132 on: August 08, 2017, 07:17:01 PM »
New tank and covers look great Steve. Nice job man. And I darn near had to break out the snow shovel today. Up here you would have had that thing rebuilt in two weeks
http://forums.sohc4.net/index.php?topic=127186.0

"You wouldn't think that out here...a man could simply run clear...out of country but oh my...oh my...nothing but the light." -Ben Nichols

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #133 on: August 08, 2017, 07:31:49 PM »
New tank and covers look great Steve. Nice job man. And I darn near had to break out the snow shovel today. Up here you would have had that thing rebuilt in two weeks

Thanks Riverman.   Was actually pretty nice here today, only 92.    Back up to triple digits this weekend....
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #134 on: August 10, 2017, 11:35:06 AM »
A little out of sequence, but lets wrap this sukka up!   

Found these old pipes in the Batcave and slapped em on!





Also found this body kit, bought it a couple years back from Chewy.  Put NOS badges and a petcock on it....






And about three months later, she is done!  I've put about 160 relatively easy miles [not over 6K RPM yet] and she is running good! 

However, I've blown the main fuse twice though, thats a new issue, never happened before.   Put a new fuse and off she went, but that concerns me a bit, must have a short somewhere but not a daily thing [I make sure I have a supply of fuses with me at all times!]


Here she is today at the local park....






...and how she looked on the day she blew!




Now I can concentrate on my Kaw H2 project, want that on the road by Oct 1.  Then a K1 is waitin' in the wings....

Damn! That's another beauty Stev-o! 
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

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #135 on: August 10, 2017, 04:04:17 PM »
A little out of sequence, but lets wrap this sukka up!   

Found these old pipes in the Batcave and slapped em on!





Also found this body kit, bought it a couple years back from Chewy.  Put NOS badges and a petcock on it....






And about three months later, she is done!  I've put about 160 relatively easy miles [not over 6K RPM yet] and she is running good! 

However, I've blown the main fuse twice though, thats a new issue, never happened before.   Put a new fuse and off she went, but that concerns me a bit, must have a short somewhere but not a daily thing [I make sure I have a supply of fuses with me at all times!]


Here she is today at the local park....






...and how she looked on the day she blew!




Now I can concentrate on my Kaw H2 project, want that on the road by Oct 1.  Then a K1 is waitin' in the wings....

Damn! That's another beauty Stev-o! 


Thanks Don, it was a fun little project and went rather smoothly...
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #136 on: August 10, 2017, 07:29:16 PM »
Bike look even better now with the OEM style. The bad luck hole in case brought something good in the end! :-)

Main fuse burn when braking?
I had a rear brake switch where the transparent bullet plug cover went off so metal on socket side could get in contact with case or engine mount. Cheap aftermarket version. It took some visual inspection and rewind the "tape" since I did not realize it was when braking when I do that without thinking.
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http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
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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
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http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
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Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #137 on: August 11, 2017, 06:53:56 AM »
Bike look even better now with the OEM style. The bad luck hole in case brought something good in the end! :-)

Main fuse burn when braking?
I had a rear brake switch where the transparent bullet plug cover went off so metal on socket side could get in contact with case or engine mount. Cheap aftermarket version. It took some visual inspection and rewind the "tape" since I did not realize it was when braking when I do that without thinking.

Thanks - thats one way to look at it!

The last time the fuse blew, I was just cruising at moderate speed [40mph] and the bike just went dead.
I pulled over, changed the main fuse, it cranked right up and was fine for the duration of the 20 mile ride.  Of the approx 7 test rides, 160 miles, it has happened twice now.

Never happened before the rebuild, but this slightly burned connector was replaced...



I plan to check the replacement alternator harness today.


« Last Edit: August 14, 2017, 06:40:01 AM by Stev-o »
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline CBGhia

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #138 on: August 14, 2017, 06:34:08 AM »
It's a bit late for the initial part of the break-in, but here's what I did on my KLR and what I plan on doing for the 650.

Ride gently to a big parking lot or whatever (I used the local high school and a local church)
Rip it up to about 5-6k RPMs, working through the gears.  Engine brake on decel,
Keep doing that for about 20 minutes
Let the engine cool
Repeat the same thing for 30 minutes
Let the engine cool.
Ride it normal, but don't go crazy with the revs for the first 1k miles.

I have heard that you want to seat the rings pretty hard by pounding through the gears, but just be careful not to over-rev.
The KLR is running well and not burning any oil, so that seemed to have worked for me.
CB550 Cafe, GL1000, Buell Ulysses
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
“Faster, Faster, until the thrill of speed overcomes the fear of death.”  - Hunter S. Thompson

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #139 on: August 14, 2017, 06:42:30 AM »
It's a bit late for the initial part of the break-in, but here's what I did on my KLR and what I plan on doing for the 650.

Ride gently to a big parking lot or whatever (I used the local high school and a local church)
Rip it up to about 5-6k RPMs, working through the gears.  Engine brake on decel,
Keep doing that for about 20 minutes
Let the engine cool
Repeat the same thing for 30 minutes
Let the engine cool.
Ride it normal, but don't go crazy with the revs for the first 1k miles.

I have heard that you want to seat the rings pretty hard by pounding through the gears, but just be careful not to over-rev.
The KLR is running well and not burning any oil, so that seemed to have worked for me.

Thats basicly what I've done, Jow, just not in a parking lot.  I've got 200 miles on it since rebuild, I'm keeping the R's below 6K..........
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #140 on: August 14, 2017, 04:02:20 PM »
It's also good to run the motor under load so finding some grades is recommended. Up and down some hills.
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

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #141 on: August 14, 2017, 04:41:12 PM »
It's also good to run the motor under load so finding some grades is recommended. Up and down some hills.

Thats no problem here in the Texas Hill Country Don, every road is up and down!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SOHC4 Cafe Racer Fan

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #142 on: August 14, 2017, 08:06:38 PM »
LOL! I was chiming in for the others out there.  I don't think you have any issues building or breaking in your bikes, Stev-o!  I wish I could build a bike as quickly (and without issues) as you can.
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

Offline 02z06dave

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #143 on: August 15, 2017, 06:09:09 AM »
Looking good stev-o. I liked the blue before, but I also like the new color. It's nice to be able swap back and forth easily. I think the stock pipes are a nice improvement as well. Its a really good looking bike you have there

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #144 on: August 15, 2017, 06:23:27 AM »
Looking good stev-o. I liked the blue before, but I also like the new color. It's nice to be able swap back and forth easily. I think the stock pipes are a nice improvement as well. Its a really good looking bike you have there

Thanks Dave. I love the blue too, but having 3 blue bikes [K4, 550F, Z1] in the garage was the deciding point to change. I have a K6 roller that I plan to use the blue bodywork on, so it's not going away.

As much as I liked the look and sound of the vintage Action Four exhaust this bike came with, I've grown to love the stock four into four pipes. And since I had three sets in the Batcave, that was an easy choice. 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline CBGhia

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #145 on: August 15, 2017, 09:24:16 AM »
It's also good to run the motor under load so finding some grades is recommended. Up and down some hills.

Could someone make some hills in North Texas for me?  I could do overpasses, but with traffic, it's hard to keep the RPM varied.
CB550 Cafe, GL1000, Buell Ulysses
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
“Faster, Faster, until the thrill of speed overcomes the fear of death.”  - Hunter S. Thompson

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #146 on: August 15, 2017, 11:54:35 AM »
Be cheaper to take the bike to the hills...guess we could carpet bomb N TX to creat a lot of big craters to ride into and out of...but doing that could yield quite a few angry Texans and there is no telling what they would do.
;D

Bike looks great Steve.

It's also good to run the motor under load so finding some grades is recommended. Up and down some hills.

Could someone make some hills in North Texas for me?  I could do overpasses, but with traffic, it's hard to keep the RPM varied.
David- back in the desert SW!

Offline Stev-o

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #147 on: August 15, 2017, 03:08:47 PM »
It's also good to run the motor under load so finding some grades is recommended. Up and down some hills.

Could someone make some hills in North Texas for me?  I could do overpasses, but with traffic, it's hard to keep the RPM varied.

Are there any hills out near Possum Kingdom, Joe?
I've always wanted to go boating there, but current boat doesnt leave Lake Travis [no trailer]
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline CBGhia

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #148 on: August 16, 2017, 07:22:26 AM »
It's also good to run the motor under load so finding some grades is recommended. Up and down some hills.

Could someone make some hills in North Texas for me?  I could do overpasses, but with traffic, it's hard to keep the RPM varied.

Are there any hills out near Possum Kingdom, Joe?
I've always wanted to go boating there, but current boat doesnt leave Lake Travis [no trailer]

Yeah, not like down there, though.  And it's still a hike from here.
CB550 Cafe, GL1000, Buell Ulysses
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
“Faster, Faster, until the thrill of speed overcomes the fear of death.”  - Hunter S. Thompson

Offline riverfever

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Re: Stev-o's K4 "Big Bang Theory"!
« Reply #149 on: August 16, 2017, 08:16:03 AM »
I got yer hills.  8)
http://forums.sohc4.net/index.php?topic=127186.0

"You wouldn't think that out here...a man could simply run clear...out of country but oh my...oh my...nothing but the light." -Ben Nichols