Author Topic: CB 750 Project 1 - Rides Well but a few tweaks needed  (Read 114241 times)

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Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #325 on: October 24, 2015, 04:51:59 PM »
Dish washer worked a treat.the only thing is I have powdery residue on the cases, I think its from the old paint as it wipes off real easy.

Discovered something else i forgot to fix. The small rubber plug on the oil gallery thats missing and unobtanium.

So here is the plan. The hole is not round so I plan to do some minor tweaking to get it close to round with a dremel. The drill the appropriate size for an 8mm thread and then plug it with a grub screw. I also thought about plugging it with the sun fix but couldn't think of a way to ensure the galleries didn't get blocked.

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Offline Davez134

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #326 on: October 24, 2015, 05:19:24 PM »
I had a powdery residue on mine after dishwasher as well. Best I could figure it was residue from detergent or minerals from the water. Either way, a final acetone wipe easily got rid of it.

Offline Terry in Australia

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #327 on: October 24, 2015, 05:52:03 PM »
(Tongue and cheek, of course)

I think that's "Tongue in Cheek" Cal............. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Terry in Australia

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #328 on: October 24, 2015, 05:56:16 PM »
Discovered something else i forgot to fix. The small rubber plug on the oil gallery thats missing and unobtanium.

Geez, I didn't know they were unobtainable Tim, I had a bag of them that I bought on eBay a few years ago, I gave the last one to Cliff to rebuild his K2 only a month ago. In the past I turned up a plug from aluminium and used a bit of sealant around it, and it was fine, but I'm sure a threaded plug would be good too. Cheers, Terry. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #329 on: October 24, 2015, 06:58:41 PM »
Terry, it's only what I read and they are  not listed on Yamiya. The odd thing is that the hole is not round and has a flat side. I am certain that my other case has a round hole.

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Offline calj737

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #330 on: October 24, 2015, 07:22:05 PM »
Thanks Terry. Damn autocorrect or predictive typing in these new fangled devices. Or maybe it was the hours...
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #331 on: October 24, 2015, 08:20:19 PM »
Got the plug sorted. Didn't need a tap once the flat spot was removed but there is not much thread biting into the case so I guess the sealant will do most of the work.

The cases came out clean after the dishwasher treatment with only a few spot missed, must be the jet angle and the position of the case in the tray. But it has highlighted how the tophalf of the case needs the old paint removed. Most of it is actually gone but whats left will cause any new paint to peel off eventually. I have a small blaster so I am going to try some soda with it and see how it comes out. Plan is start engine assembly in 2 weeks.

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« Last Edit: October 24, 2015, 08:22:01 PM by timbo750 »

Offline Terry in Australia

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #332 on: October 24, 2015, 09:51:38 PM »
Go to Bunnings and buy a pint of their paint stripper Tim, it'll rip the paint off and leave the cases shiny and clean.

 I first used it on my F2 cases that had been painted several times, (badly) had been in a fire, and had been painted again in the frame. The Bunnings stripper ripped the paint off. Cheers, Terry. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #333 on: October 24, 2015, 09:56:39 PM »
I have got some Diggers brand in the shed, I will use that.

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Offline edwardmorris

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #334 on: October 25, 2015, 11:00:25 AM »
Yea, those oil galley plugs are unobtanium. I lucked out and located two at a dealership. I've asked Elan to look into building reproductions but its seems like its too costly to do.

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #335 on: October 27, 2015, 12:44:20 AM »
Well I don't know what the coating is on the engine but the paint stripper is not touching it. It will come of with a wire wheel on the dremel but that is going drive me nuts. I will try brushing the paint stripper with a small wire brush and see what happens.

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Offline Retro Rocket

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #336 on: October 27, 2015, 02:26:30 AM »
Well I don't know what the coating is on the engine but the paint stripper is not touching it. It will come of with a wire wheel on the dremel but that is going drive me nuts. I will try brushing the paint stripper with a small wire brush and see what happens.

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On stubborn paint I sometimes use gloves, paint stripper and stainless steel wool.... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline Terry in Australia

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #337 on: October 27, 2015, 04:05:16 AM »
That diggers stuff is good on single pack paints Tim, but if some genius has used 2 pack, you'll need to go to an auto paint store and get some super heavy duty stripper designed to remove hardened paint. Cheers, Terry. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #338 on: October 28, 2015, 12:04:00 AM »
Thanks Terry, got some and have smeared it around. Just have to wait and see,  it certainly smelt more toxic.

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Offline Terry in Australia

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #339 on: October 28, 2015, 12:07:40 AM »
No worries, the stuff I bought at an auto paint shop is supposed to remove tank sealant, so it should rip any hardened paint off. Cheers, Terry. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Retro Rocket

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #340 on: October 28, 2015, 12:40:00 AM »
Thanks Terry, got some and have smeared it around. Just have to wait and see,  it certainly smelt more toxic.

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Thats why I suggest gloves, good paint stripper is nasty stuff and burns your skin on contact. Give the steel wool a go in the hard to get at sections, I used to use it on push bike frames and it worked a treat...... ;)
750 K2 1000cc
750 F1 970cc
750 Bitsa 900cc
If You can't fix it with a hammer, You've got an electrical problem.

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #341 on: November 04, 2015, 03:09:13 PM »
Managed to get it acceptably clean for painting. Used the heavy duty stripper gloves and wire brushes of different sizes. After a wash the dremel got rid of the last bits. Now I just need to do the other half. One these years I will actually get this thing going.

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Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #342 on: November 08, 2015, 09:52:04 PM »
Got into the shed on sunday and got some stuff done.

Found some dried up paint stripper on the case in those tight little hard to get spots so I got out the pressure cleaner. I did this once before and got soaked from head to toe from the splash back so this time I split an old 2litre plastic container and made a guard. Not only was I drier but I was able to blast those tight spots for longer. Then got the air nozzle to blow out all the threads and found the bottom of the main bearing threads still had silicone in them and enough that may of affected torque on the bolts.

Got out the bezels for the gauges and stripped them back and got some nice gloss black, I haven't picked them up and had a good look yet but they hopefully won't need sanding, also sprayed the final coat on the caliper and it ready to go back on. I had actually sprayed both the caliper and the bezel's before but at separate time I had dropped them and chipped the paint so they needed redoing.

I thought that after cleaning the engine I would be on track this weekend to start assembling the lower cases, and realised that with all the parts I have ordered form different suppliers I have forgotten to order a new set of drive chains. now ordered fro Yamiya and if I am lucky they may arrive on Friday.

The other I have noticed is a slight burring or raised section of the casing at where the cam slider fits in. I have not checked yet if I am likely to encounter any issues fitted the casing (didn't have it at home) so will check that during the week. there are some photos of this below.

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #343 on: November 12, 2015, 01:53:48 AM »
Got the chain, ordered it monday got it Wednesday. Great service Japan to Aus in 2 days. Now I just need to hope that I actually get shed time.

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Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #344 on: November 14, 2015, 05:35:44 PM »
Putting the engine back together finally. I have been making sure all parts move with no resistance as I go,  I was sliding the gear on the primary shaft to observe how the gears lock and noticed that it didn't lock on one side. So looked closely to determine if it should lock before I checked the manual. And once again the stupid PO has got me again. He has reassembled the shaft with one gear on the shaft the wrong way around, so now I am off to buy a bearing puller so I can fix the issue.

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Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #345 on: November 15, 2015, 12:15:05 PM »
Got the bearing off easy with the right tool and swapped over the gear so it works as it should. I got all the shafts in place, including the shift drum and forks and got some of the shift mechanism in place as well. I am planning to test fit it first to make sure he gears shift as they should before I seal them up properly. let me know if anything looks out of place in the photos.

Offline edwardmorris

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #346 on: November 15, 2015, 02:32:41 PM »
Can't tell from the angle but the shift drum's notch needs to be at 8 O'clock or you may have trouble getting it in neutral and seating the neutral switch.

Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #347 on: November 15, 2015, 03:44:27 PM »
Yeah I scoped the switch out along the drum position but didn't have the o'ring handy that goes with the switch so that will be the next to go in.

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Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #348 on: November 15, 2015, 11:05:40 PM »
Got the cases test fitted and all seems to work well. I shifted through all the gears and got drive to the final shaft in all gears.
I started checking to make sure I have all the correct bolts and you would guess I  don't.  So will pick up what i need tomorrow and try to get it together before the weekend.

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Offline timbo750

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Re: CB 750 Project 1 - Getting engine ready for assembly
« Reply #349 on: November 19, 2015, 12:31:36 AM »
Cases are together, sealed and torqued down. Have to lap the valves before the head goes on so final assembly might not be for a few more weeks but I am hoping to have the engine in the in the next 4 weeks.

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