Author Topic: 1973 CB750 Custom Build on Hack A Week (Read 103718 times)

Dino · « **Reply #50 on:** January 17, 2015, 12:05:27 PM »

Hey everyone... been a while.

I'm finally getting back to work on the CB750 project after a garage remodel. New work bench, big ass tool box at home now, more shelves for storage, better lighting. I'm trying something different with the connecting rod/piston/cylinder install. Doing it upside down with the bottom of the case removed.

Dino · « **Reply #51 on:** January 19, 2015, 04:31:19 AM »

Part 14... upside down piston/cylinder/connecting rod install.

SOHC4 Cafe Racer Fan · « **Reply #52 on:** January 19, 2015, 09:54:33 AM »

Great videos, Dino.

Riceman · « **Reply #53 on:** January 19, 2015, 11:44:17 AM »

Nice!, didn't have too wait to long for #14...

I had to go back to # 5? to figure out that a locking
nut was not needed on top of the bearing seal nut
on the fork stem...

Restoration Fan · « **Reply #54 on:** January 19, 2015, 12:49:58 PM »

I posted a comment under the YouTube video, but it may have been easier to use a bottle jack to raise the head up. The way you did it was pretty ingenious with the little tubes to screw on but I would have gone with the "lazier" method of using a bottle jack and a piece of wood to slowly lift the head up onto the studs.

persson-johan@hotmail.com · « **Reply #55 on:** January 25, 2015, 11:47:13 AM »

Great videos! Been watching all of them

Dino · « **Reply #56 on:** January 26, 2015, 02:40:10 PM »

Crankcase goes together.

Ravie · « **Reply #57 on:** January 26, 2015, 06:26:43 PM »

The back on my K5 case has 2 bolts that get nuts on them...I don't have a third one like you talked about was missing. Interesting...

Dino · « **Reply #58 on:** January 31, 2015, 05:47:05 AM »

Cylinder head install.

BPellerine · « **Reply #59 on:** January 31, 2015, 09:40:43 AM »

I think that you need those oil jets to maintain pressure.bill

70CB750 · « **Reply #60 on:** January 31, 2015, 09:44:22 AM »

Quote from: BPellerine on January 31, 2015, 09:40:43 AM

I think that you need those oil jets to maintain pressure.bill

True. Withou oil jets the bottom will starve and kill crankshaft bearings.

seanbarney41 · « **Reply #61 on:** January 31, 2015, 01:05:38 PM »

Quote from: 70CB750 on January 31, 2015, 09:44:22 AM

Quote from: BPellerine on January 31, 2015, 09:40:43 AM
I think that you need those oil jets to maintain pressure.bill

True. Withou oil jets the bottom will starve and kill crankshaft bearings.

yep...not an optional part. Also, it's pretty much universally accepted that the cam tower pucks will leak prematurely without some Hondabond or other non-hardening sealer.

Dino · « **Reply #62 on:** January 31, 2015, 01:55:41 PM »

Thanks guys. I'm searching for those oil metering jets so when I take the cam holders back off I'll add Hondabond to the pucks.

Mikey S · « **Reply #63 on:** January 31, 2015, 06:19:44 PM »

Been enjoying the vids for a long time Dino. Loved the Sabre build, and really excited to see you work on an orange '73 for obvious reasons. Thanks for all of the ingenious tips you've given me over the years.

seanbarney41 · « **Reply #64 on:** January 31, 2015, 06:30:38 PM »

The oil jets are long discontinued and hard to get used 'cuz guys always lose them...measurements are posted here on the forum somewhere and can be made on a lathe. One recent poster on this thread can do it!

I will let him speak up if he wants. He may not be wanting to mess with it...

BPellerine · « **Reply #65 on:** January 31, 2015, 06:43:39 PM »

member dhoulton in services offered.bill

AintNoEasyWay · « **Reply #66 on:** January 31, 2015, 09:21:08 PM »

Here's a fairly recent thread I had about oil jets: http://forums.sohc4.net/index.php?topic=142986.0

Lots of people chimed in.

Dino · « **Reply #67 on:** February 01, 2015, 05:27:04 AM »

Thanks guys. I've consulted Hondaman via PM and he said they have to be in there or bad things happen to the main bearings very quickly. If I had the dimensions and hole sizes I'd just make some on a lathe.
EDIT: I found the drawing of the oil metering jet that Hondaman posted so maybe I'll try making some.

Restoration Fan · « **Reply #68 on:** February 01, 2015, 05:44:11 AM »

Quote from: Dino on February 01, 2015, 05:27:04 AM

Thanks guys. I've consulted Hondaman via PM and he said they have to be in there or bad things happen to the main bearings very quickly. If I had the dimensions and hole sizes I'd just make some on a lathe.

Dino,
Love your videos. Been watching them for quite some time on other stuff as well. Here's a link to a thread where HondaMan gives those dimensions & hole sizes. Has the technical drawing in it.

http://forums.sohc4.net/index.php?topic=134855.msg1515632#msg1515632

70CB750 · « **Reply #69 on:** February 01, 2015, 08:56:08 AM »

Quote from: Dino on February 01, 2015, 05:27:04 AM

Thanks guys. I've consulted Hondaman via PM and he said they have to be in there or bad things happen to the main bearings very quickly. If I had the dimensions and hole sizes I'd just make some on a lathe.
EDIT: I found the drawing of the oil metering jet that Hondaman posted so maybe I'll try making some.

It is not that hard to make oil jets, HM drawing is from what I understand on the smaller end of metering hole, the hole was bigger in later production years.

Check out the service offered section.

Dino · « **Reply #70 on:** February 07, 2015, 01:58:20 PM »

Mike Rieck sold me two metering jets. Thanks Mike!

I got the shifter assembly together today. One step closer to a completed engine.

SOHC4 Cafe Racer Fan · « **Reply #71 on:** February 07, 2015, 07:09:17 PM »

Dino,

Kicking this project into high gear - no pun intended!

SOHC4 Cafe Racer Fan · « **Reply #72 on:** February 09, 2015, 07:45:54 AM »

Really great job showing not only assembly but how the shifting is accomplished.

Dino · « **Reply #73 on:** February 14, 2015, 04:26:59 AM »

Oil pump got installed this week. It was in good shape and only needed the usual o-rings. A few viewers have mentioned that I should have primed it before installing it but I'm thinking that could be done via the oil inlet fitting. I guess I'll find out when the time comes.

Next week I'll get the oil metering jets installed along with the camshaft and rocker arms.

mystic_1 · « **Reply #74 on:** February 14, 2015, 07:15:28 AM »

No need to prime the oil pump on a 750, gravity feed from the tank will take care of that on startup. I've never primed an oil pump on a 750 and never had a problem.

Kick the engine over a few times or crank the engine over with the kill switch turned off prior to firing it up for the first time, and you should be ok.

BTW the leak stopper valve keeps oil from running down from the tank into the motor when the motor is not running. If it's not working, the tank will drain down into the engine sump over time and the oil level in the tank will be low before startup, then return to normal after startup.

mystic_1

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Author Topic: 1973 CB750 Custom Build on Hack A Week (Read 103718 times)