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View Full Version : About time I start this CB750 build thread...



CarloFreeze
02-25-2015, 6:06 PM
Hey guys. I've been working on this project kind of slowly over the last few months, but I'm starting to make some good progress so I figured I'd share it.

Here's your standard 1978 Honda CB750K. I picked this up for $200 with an extra 1974 motor.

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Then I started stripping it down and cut away the triple backbone over Thanksgiving.

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Next I cutaway the seat section and this is how I left it for about a month.

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I found a used Honda XL350 front end that I think will look super clean on this build. The trees look much better than the standard CB750 ones and open up the possibility of different risers if need be. I was thinking of going with shaved forks and these pretty much already are so I just have to clean them up. I wanted to go with a 21" wheel and didn't really want to re-lace a standard 750 hub to one. I'm going for clean bars with just a throttle, clutch and brake levers on them.

Once I was around over Christmas I got a chance to mock up some of the parts I'd been getting. I also went with a CB550 swingarm because that tubular steel just looks a lot better.

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CarloFreeze
02-25-2015, 6:12 PM
Next thing I did was mock up a seat section out of cardboard to see how to tie it all back together. Here's what I came up with.

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Here's it is all welded up.

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So there's where I stopped while I spent some time getting some more used parts for the build and thinking of what other things I want to add.

In the meantime I picked this superglide tank and Sears headlight off the ChopCult classifieds.

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CarloFreeze
02-25-2015, 6:18 PM
A few weeks back I picked up these cool 60's Italian race bars at the Timonium Swap Meet along with this cool Tomasselli throttle.

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So this brings us to today. I finally got a chance to mate the tank with it's new home on this 750's backbone.

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I couldn't stand to wait to see what it'd look like with the motor in there, so I lugged that heavy bastard 100 yards up the ice slicked driveway and into the garage.

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This is the exhaust that was on the bike, not sure where I'm going to go with it yet.

CarloFreeze
02-25-2015, 10:32 PM
Knocked out the mounting for the coils tonight.

Now you see me.
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Now you don't.
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PeteyD13
02-26-2015, 6:53 AM
Looks like you're making some decent progress. Are you going with struts or shocks for the rear suspension?

Westboundbiker
02-26-2015, 7:20 AM
by the way, if you are going to but blinkers and stuff on the bike, and still want to be able to control them without taking your hand off the bars, here's what my buddy is using on his bike: http://www.gripace.com/Custom.htm

Hotel
02-26-2015, 7:54 AM
Defiantly will be following this one! Im digging it

CarloFreeze
02-26-2015, 9:07 AM
Looks like you're making some decent progress. Are you going with struts or shocks for the rear suspension?

I'm going to be using shocks. I used the piece of wood with holes drilled in it at different measurements so that I can get the stance of the bike where I want it before I order the shocks. I wanted to see how it looked at 11.5" and 10.5" and I liked the shorter stance. The only problem with the CB750 and 70's Honda in general is that the shortest shock they make is 11.4" with a lower clevis mount. What I'm going to have to do is cut off the mounts on the swingarm and change them to a clevis so that I can get 10.5" eye to eye shocks like a Harley. Not really a big deal, but I don't have the shocks to start doing that yet.

billybiltit
02-26-2015, 9:58 AM
awesome build!
can't wait to see it evolve!

keep us posted,

leon

CarloFreeze
02-26-2015, 11:02 PM
Tonight I mocked up an horseshoe style oil tank from cardboard.

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CarloFreeze
02-27-2015, 12:03 PM
Oil tank starting to take shape. I'm going to leave it in this state for the time being until I can get the bung fittings and filler cap I need for it.

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CarloFreeze
03-01-2015, 12:20 PM
Got the triple tree back from the machine shop. I had to have the XL350 top and bottom trees opened up to accept the stem from the original trees. With that done I was able to stick the handlebars on. I still need to shorten the forks, but I'm going to wait and get fork seals and polish the lowers.

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PeteyD13
03-02-2015, 6:52 AM
I'm going to be using shocks. I used the piece of wood with holes drilled in it at different measurements so that I can get the stance of the bike where I want it before I order the shocks. I wanted to see how it looked at 11.5" and 10.5" and I liked the shorter stance. The only problem with the CB750 and 70's Honda in general is that the shortest shock they make is 11.4" with a lower clevis mount. What I'm going to have to do is cut off the mounts on the swingarm and change them to a clevis so that I can get 10.5" eye to eye shocks like a Harley. Not really a big deal, but I don't have the shocks to start doing that yet.

Good call. 10.5's will look bad-ass.

CarloFreeze
04-16-2015, 6:00 PM
Hey everyone. I got a bunch more parts together finally so I've made a lot of progress over the last few days and wanted to keep this thread current with what I've been up to.

I got a set of 10.5" shocks, all the fittings for the oil tank, new seals for the forks, steering stem bearings, pegs, and some other bits and pieces.

I started on Monday by disassembling the front forks so that I could polish out the lowers. The were originally painted gray so I just some stripper to remove the old paint and got to wet sanding with 220, 320, 600, then a final buff out with Mother's.

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CarloFreeze
04-16-2015, 6:02 PM
My next job was to get the rear shocks put on. I had to cut off the eye mounts on the swingarm and weld on some clevis mounts to accept these new 10.5" shocks.

Here's how it came out.

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CarloFreeze
04-16-2015, 6:04 PM
Today I threw the tank back on and got a headlight bracket made up and the foot pegs mounted. I ended up cutting the old pegs off and reusing the mounts for these Harley style ones.

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billybiltit
04-17-2015, 1:12 PM
nice progress !

leon

CarloFreeze
04-20-2015, 8:12 AM
Here's some shots of the oil tank coming together. I got a top made up and brazed the vent and return tubes to the NPT fittings.

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CarloFreeze
08-13-2015, 8:44 PM
I'm up again for a week and it's time to make some new progress on the build. I bought a shovelhead fender here on Chop Cult to try out, but I wasn't happy with how it looked and wasn't confident that narrowing and reshaping it was going to make for a good looking rear section. I was digging around my bike shed and I found this Yamaha TX500 rear fender laying around so I slapped it on the rear tire and it had the right radius and look that I wanted without changing too much.

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I ended up remaking the oil tank I was working on back in April because the metal I used was too thin and the seams weren't welding up very well. I got some heavier gauge steel and got to work on making the new one. Here it is stuck in place, but not mounted yet.

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CarloFreeze
08-13-2015, 8:47 PM
Today I got the mounted on the rear fender figured out. I still am going to add some struts inside the fender to stiffen it up a bit in the back.

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I also received an Ironhead replica kickstand in the mail today. I wasn't really sure how it was going to fit with the left side exhaust so I broke out the motor and exhaust pipes and mounted that big bastard back in the frame.

Here's the stand all welded on.

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CarloFreeze
08-13-2015, 8:49 PM
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Freewheeler
08-14-2015, 9:39 AM
Looks good Carlo, some good quality components and workmanship there.

The old old Honda 4's really do make great looking chops.

Nick

CarloFreeze
08-14-2015, 4:15 PM
Today I started tearing the motor apart. The plan is to balance the rotor and crank, bore for 836 pistons, port the head, and do a valve job. Should make for a super smooth running motor and it'll be fast as fuck. I need to get myself a rotor puller so I got it pretty much ready to split the cases once I can pull the rotor off.

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This is pretty much as it sits for now until my puller comes.

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CarloFreeze
08-16-2015, 8:20 AM
Fully split cases
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