1978 CB750F - Metric Mayhem

Re: 1978 CB750F (METRIC MAYHEM)

Frame is back from being powder coated:
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Not me in the photo, that's another Aaron (There's two!) who hooked me up with the powder coating job. He busted up is leg pretty good when somebody hit him while he was on his 550, and is still doing rehab.

We stuck with the red on the frame, but went with metal flake instead of solid as painted previously. I wasn't 100% sold on the original enamel paint, and got a good deal on powder coating. So it was re-done.
 
Re: 1978 CB750F (METRIC MAYHEM)

Comstar rims are being re-painted as well. The edge of the rims will be masked off when painted black, and left bare. It should look pretty cool:
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The tabs pop off with a screw driver. Primed:
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Re: METRIC MAYHEM 1978 CB750F (New Photos!)

The donor transmission is on the way! Found one in great condition on eBay for $60...

And now photos!

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Close up so you can see the metal flake
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These are the tank badges I had 3D printed in plastic.
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New pistons from Dynoman vs. the old stock pistons.
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After all of the head work had been completed.
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Re: METRIC MAYHEM 1978 CB750F (New Photos!)

Sorry in advance for the poor photo quality on some of the photos...

Painted:
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Mounted:
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Close up of the rim badges.
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Rubber:
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Re: METRIC MAYHEM 1978 CB750F (New Photos!)

Here is some artwork I did for my friend buddy Aaron who is helping me on the bike. I went for an Ed Roth kind of look on the style. He hopes to open a shop called Metric Mayhem, so that's where I came up with the name for this bike. The tank badges logo is actually the logo I created for him. Hopefully we will get some vinyl stickers made up soon.

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Re: Project "METRIC MAYHEM"

More photos!

This was pretty boogered up, and had to be repaired. It won't be perfect, but after its painted black who cares.
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Needed to be JB welded on the inside just in case.
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Old paint removed, and ready to be painted.
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Lots of black paint and powder coating:
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New speedo and tach with built in LED cluster. Originally wanted white faces, but it wasn't available in the tach at the time.
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I got a free viper fairing, but the windscreen was all scuffed up. I used a headlight restoration kit, but I got better results with buffing/polishing compound and Meguiars scratch X 2.0 to bring back the shine. The fairing has been painted to match the tins.
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Re: Project "METRIC MAYHEM"

I will be going with K&N oval style pod filters on the bike. I'm hoping that these will work really well with the added cc's and yoshi style exhaust.

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The oil pump is in great condition, but will be getting new o-rings.

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Here is a photo of the donor transmission.

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I also picked up a steering damper off ebay. It is 6 step adjustable, and I hope it works well.
 
Re: '78 CB750F - Project - "METRIC MAYHEM"

After almost four years, off and on, this build will be completed in a month or so, hopefully. In a couple of weeks we are going to get try and get it started for the first time. I think the only parts I have left to purchase is a couple of master cylinder rebuilt kits. Just about everything else is ready to go and be put together. I will be taking lots of photos and some video.
 
Re: '78 CB750F - Project - "METRIC MAYHEM"

There was a lot of work done on the bike this past weekend, but we weren't able to try and get the engine started. We ran into some issues with the motor. The aftermarket head gasket had to be modified to fit. Also, we thought we were missing some engine dowels, but it turns out we only needed four and not eight (weird F motors...) Then we had issues removing a bolt that had snapped off in the bottom cases. The easy out broke off in the bolt. Then after finally getting that out, plus the remainder of the seized bolt, a Heli-Coil insert had to be installed. Luckily it went in very easily, and gave us no more issues after that. After some heavy lifting and straining, we got the motor into the rolling chassis. I took too many photos to post here. Instead I'll just post the link to my Flickr set where I am keeping all of my photos of the complete build.

Here is the link to the full set of pictures:
http://www.flickr.com/photos/scroggins5000/sets/72157606346430260/

The new photos start on page three. Here is a direct link to that:
http://www.flickr.com/photos/scroggins5000/sets/72157606346430260/?page=3

Enjoy.
 
Re: '78 CB750F - Project - "METRIC MAYHEM"

lookin' mighty fine scroggins. love that tank badge.


cheers
ian
 
Re: '78 CB750F - Project - "METRIC MAYHEM"

bikeboy said:
lookin' mighty fine scroggins. love that tank badge.


cheers
ian
Click to expand...

Thanks Ian. I couldn't have been happier with how the tank badges turned out.
 
Re: "METRIC MAYHEM" - too many new photos to post

Here are a few photos detailing some of the issues we had with the motor.

Photo of the new 836cc piston set from Dynoman being placed in the head. We tried to put the pistons in the jugs first then dropping it on and connecting the rods. It ended up being easier to go with the traditional route.
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Here is a photo of the bottom end before the jugs went on.
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The aftermarket head gasket that came with the 836cc kit had to be modified. The oil passages were too small for the engine dowels and o-rings to be placed. I opened them up with a Dremel tool, hammered the paper back flat, burned off the excess, and cleaned up the metal with a fine-tooth curved file.
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Now it fits.
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Before the head gasket was done, we thought we had an issue with missing engine dowels for the oil passages between cylinders 1-2 and 3-4. We had four dowels, but had 8 o-rings in the gasket set. After searching the entire shop for more engine dowels, we thought we were going to have to wait to finish this engine until we could buy more. Thankfully this was not the case. After getting online and checking with parts fiche's quantity numbers. We found out we did in fact only need 4. The F2 and F3 models only use 4 out of the 8 passages, and only the K models use all 8. I have no idea why. Anyone?... The 4 passages closest two cylinder 2 & 3 are plugged up underneath the jugs. We didn't remember that because we put the jugs on the night before. The F2 and F3 only use the oil passages closest to cylinders 1 & 4. Just FYI if you have a later F model...


Two of the spark plug holes had to have time-serts installed because of corrosion.
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Head on.
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Cam installed.
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Rocker arm installation.
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Valves were adjusted and then the cover went on.
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We flipped the motor over and were getting ready to put the bottom cases on, and found one of the bolts had sheered off and needed to be tapped out. The first attempt, the easy out, snapped off in the bolt...

Here is a photo of that mess...
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After a while it finally all came out. We got it tapped, and inserted a heli-coil.
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We got the transmission installed.
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We moved on and got the oil pump and screen installed.
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Cases on.
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Re: "METRIC MAYHEM" - too many new photos to post

Donor transmission ended up being incorrect, but I didn't really need it anyways. Not sure what model it's from, but it's about half the size of the 750's. I'm thinking it may be off of a 350. Not sure yet. I need to find out so I can get rid of it.
 
Re: "METRIC MAYHEM" - too many new photos to post

Photos of the engine in the bike.
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That's my friend Aaron in the photos. He is the one I'm learning from, and helping me put this thing together.
 
Re: "METRIC MAYHEM" - too many new photos to post

Couldn't resist slapping the tank, seat, and exhaust on to see how it looked.

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The rear engine bolt will need to be shorter, because of the removal of the aluminum brackets that the pegs were on. We will probably go with some all-thread and cut to fit, instead of modifying the current bolt.
 
Re: "METRIC MAYHEM" - too many new photos to post

The carb boots were hard as rocks, and they needed to be softened. I had read about the wintergreen oil mixed with xylol. Wintergreen is kind of costly, so we came up with our own mixture. Since that is just an oil mixed with thinner, we used linseed oil and mineral spirits. We decided to heat the mixture to speed up the process. We didn't watch it close enough, and it flared up. We put a lid on it and removed it from the flame and it was fine. After that we decided to get it to a boil, and turn off the flame and let it rest until it cooled down. After they cooled down they were pliable, and had their sheen restored. We heated it up once more and left it in the mixture the rest of the day.

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They came out great. Heating is probably not even needed, but it doesn't hurt (unless it catches fire).
 
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