1980 CB750K Cafe Project (hopefully)

[shinyribs]

You may be seeing carbon build-up making them look rough. That stuff is really hard to scrub off.

Anything I hose off with water, I give a shot of PB Blaster to protect it from flash rusting.

A magnet is handy for pulling the valve retainers out.

If you get water down an intake or exhaust port it could settle on a valve face and cause rust, which will defeat any hard work accomplished lapping the valves. Some tightly crammed in ( highly official industry terminology) shop rags will keep any water out, but they will retain any moisture they may catch. Just swap em for fresh, dry ones if it comes to that.

I didnt meant to imply you NEEDED to strip your head down. Just meant it was a good time to check it for leaks incase the valves did need lapping. But hey, if you're up for the task, why not!

[Griffin]

I'm glad I'm breaking it down. There seems to be a lot of carbon build up to me, so I think it's for the best. The carbon on the faces seems hard like metal. I ran it on a brass wire wheel and that didn't remove it. I'll get the intake valves out tomorrow.

BTW Oil Eater is working really well and it's nontoxic.

On Apr 12, 2016 9:45 PM, "shinyribs [via Honda CB750'S]" <[hidden email]> wrote:

You may be seeing carbon build-up making them look rough. That stuff is really hard to scrub off.

Anything I hose off with water, I give a shot of PB Blaster to protect it from flash rusting.

A magnet is handy for pulling the valve retainers out.

If you get water down an intake or exhaust port it could settle on a valve face and cause rust, which will defeat any hard work accomplished lapping the valves. Some tightly crammed in ( highly official industry terminology) shop rags will keep any water out, but they will retain any moisture they may catch. Just swap em for fresh, dry ones if it comes to that.

I didnt meant to imply you NEEDED to strip your head down. Just meant it was a good time to check it for leaks incase the valves did need lapping. But hey, if you're up for the task, why not!

A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.~George Washington

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[shinyribs]

Cool deal. I'll have to check out that oil eater.

I've ground carbon off of valves with a wire wheel (steel)on a bench grinder. That stuff is incredibly hard. You can gouge up a valve seat surface pretty easy with a wire wheel, so be careful. I haven't found anything that will dissolve it, but there could be some info on that somewhere.

The thing about carbon build-up is it's GONNA happen. Period. So, I usually knock off the biggest offending lumps, but getting one 100% pristine is kinda pointless.

[Griffin]

Valves are all out and cleaned up.


This was one of the worst before and after.

[Griffin]

Lapping is done on the exhaust valves, now I'm putting them back in. What a pain that is. Took me 45 minutes or so to get the first two installed. Those keepers are a real hassle. Seems to go in best when I apply pressure on both and get them to drop in together. If one goes in before the other forget about it. Had to stop for today. Hoping to get the exhaust side finished tomorrow and start the fuel side.

On Apr 13, 2016 9:07 PM, "Griffin [via Honda CB750'S]" <[hidden email]> wrote:

Valves are all out and cleaned up.


This was one of the worst before and after.

Dave Arnold
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[shinyribs]

Already reasembled? How are your valve seals? I've never seen a valve pulled out, and back in, through a valve seal that didn't hurt it. We always considered valve seals as consumable when removing/reinstalling valves. They just get knicked too easily.

[Griffin]

Two of them are back together. I didn't remove the seals or guides. I'll try to inspect them before I put more valves back together.

On Apr 14, 2016 11:27 PM, "shinyribs [via Honda CB750'S]" <[hidden email]> wrote:

Already reasembled? How are your valve seals? I've never seen a valve pulled out, and back in, through a valve seal that didn't hurt it. We always considered valve seals as consumable when removing/reinstalling valves. They just get knicked too easily.

A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.~George Washington

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[Griffin]

Valves seals look good to me.  Probably not all that scientific but I shined a light down there to look for cracks and scratches but didn't see any.

On a positive note the valves are going it much faster now.  Only 4 left to install and the head is done.

On Fri, Apr 15, 2016 at 8:18 AM, Dave Arnold <[hidden email]> wrote:

Two of them are back together. I didn't remove the seals or guides. I'll try to inspect them before I put more valves back together.

On Apr 14, 2016 11:27 PM, "shinyribs [via Honda CB750'S]" <[hidden email]> wrote:

Already reasembled? How are your valve seals? I've never seen a valve pulled out, and back in, through a valve seal that didn't hurt it. We always considered valve seals as consumable when removing/reinstalling valves. They just get knicked too easily.

A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.~George Washington

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[Griffin]

Got all the valves lapped and reinstalled.


Installing the valve keepers definitely got easier the more practice I got.

I plan to install the new head gasket tomorrow and torque down the head.

[Griffin]

Started painting the engine today and got the head back on and torqued to spec. That made me realize the nuts were loose before. I'm hoping doing the valves, replacing the head gasket, and torquing it down properly brings the compression into spec. It was equally low in all cylinders before.

Pics from today.
All taped up



Primer



Oil filter cover is done


I also removed the clutch cover and polished it. But forgot to take a picture.

[shinyribs]

You are rolling

[Griffin]

Thanks it's rare that I get more than an hour or so at a time to work on it. I got lucky on Sunday and spent several hours on it.

One of my valve cover bolt was missing so I order a used one without the seal and a new set of seals thinking I could replace them all.

Found out the new valve cover seals I ordered are wrong so I'm waiting on a used set of bolts with seals to come in. I'll mix and match to get the best seals.

Also found out putting a seal on one of these bolts is pretty much impossible. Maybe there is a trick to it but I couldn't figure it out. Maybe a heat gun would make it pliable enough. No matter, I'm thinking the used set I ordered will do just fine.

I don't understand how these things get damaged actually. Nothing should come in contact with them. I guess the hot oil breaks down the rubber.?.?

My work days have been so busy, maybe I can get another good push this weekend.

On Apr 18, 2016 11:47 PM, "shinyribs [via Honda CB750'S]" <[hidden email]> wrote:

You are rolling

A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.~George Washington

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[Griffin]

Painting the engine

[Griffin]

Got it down to just the frame today. The sterning felt rough will have to repack the bearings or replace them. Going to clean them up and check for damage first. Wasn't expecting that. I have another frame with a steering stem and berrings that are smooth so swapping them won't be a problem.

This pic is after using a car was to pressure wash it.

[Griffin]

I feel good about the progress this weekend. Spent most of the day stripping the frame down to bare metal. I got the rear cut off and some extra tabs removed as well.

[Griffin]

Anyone see a problem mounting the rear master cylinder here? After moving the battery and wiring I don't believe anything is left to get in the way.


For context I'm installing an F model swing arm and brake on a 1980 K in order to get disk brakes on the front and back.

I'm thinking I can weld on studs so I can bolt it down and secure it with nuts on the inside.

[shinyribs]

I'm having a hard time picturing where that location is.  But if your linkage ratios and all that good stuff are working out, and you got clearance for all your body panels and stuff, yeah...rock on with it.

What diameter MC is that? Seems small for the brakes you wanna run. I don't really know, just throwing it out there.

[Griffin]

The piston is 14M I got it here http://www.ebay.com/itm/291660514527.  The list of supported bikes includes cb1000 and other big sport bikes. I figure it will work out fine after welding on some mounting studs.

The brakes are stock single piston calibers from a 1979 CB750F.  The swing arm and wheels are from a stock 1980 CB750F. 

On Tue, Apr 26, 2016 at 10:21 PM, shinyribs [via Honda CB750'S] <[hidden email]> wrote:

I'm having a hard time picturing where that location is.  But if your linkage ratios and all that good stuff are working out, and you got clearance for all your body panels and stuff, yeah...rock on with it.

What diameter MC is that? Seems small for the brakes you wanna run. I don't really know, just throwing it out there.

A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.~George Washington

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[Griffin]

Started working on the under tail tray but stopped because I didn't know where the loop would end up.
I'm working on the seat now. After cutting the loop down to size I built up the hump with a foam craft ball and some cardboard. Then I taped it covered it with a T-shirt and laid down the first layer if fiberglass.




After the hump sets up I'll start the rest of the pan. Just wanted to do it in sections. I think I got it just the right shape and size. Seems to fit in well with the tank.

[Griffin]

Note to self wrap styrofoam in foil before using resin.
I'll fill the dips after it hardens up. I'm sure it will still come out well.