Honda CB750 Restoration - Splitting the Engine Cases Part 7

Well, our engine is opened up to reveal all its secrets. Hope you enjoy! Special thanks to those who have supported this channel via Patreon.
www.patreon.com/peteranderson

[@darrenanderson4436]

hi Pete when you wash your engine case's put them in the dish washer it cleans case's perfect. I have an old dish washer in the shed for cleaning my jet ski case's and bike case's parts. The wife kept going mad when she would find engine case's in her dish washer. So I got S/Hand 1 at garage sale and works great and gets very hot perfect for striping old crap off. I just use power ball tablets.

[@PeterAndersons]

Not a bad idea at all... but my wife would go nuts. Sometimes I reckon I stretch my marriage enough as it is, so I may need to follow your lead and grab a second unit. Cheers

[@banjoboy4212]

Hi from Tassie. I am ex BMW and Velocette rider and loving these vids. The standard of engineering used in these CB 750's is really impressive, wish I bought one in the day.

[@majedkhurshid5780]

Really love the videos Peter and they are very well done. Thanks for all of your expertise and advice! All of us Honda guys owe you a solid.

[@stewartmackay539]

Love the series. I am learning so much. Many thanks

[@tonybaartman327]

Hi Peter, Love your channel, THANKS SO MUCH!. I find myself in exactly the same boat, busy with a '68 Mustang and '72 Perana. Winter here in South Africa and need to get painting done, so I've re-started on a 2yr old project '76 Suzuki GT750, inspiration from your CB750 build :). I've taken the risk and also gone Cruzinimage Piston & rings done a fair amount of research and as you've seen many good responses. A mate of mine used their kit in an '83 Kawasaki and has done about 5k Km's since his rebuild with no issues and his not that kind on the motor. Keep up the great work and enjoy!!! Cheers

[@luvtheus]

Thank you Peter! I'm in the middle of restoring a 73 b750 k3 and will be doing this soon. Your video has great shots. You are a brave dude

[@joselorenzoperez6603]

Thanks Peter. I reinforced my knowledge on how to check up my engine. I have not opened it yet but hope do this this December. since the "mechanics" almost ruin my whole bike I promised myself to be its own mechanic. Thanks Peter....

[@MidwestMotoRider]

Good foundation is an awesome start as you well know. Can't wait for the next installments when ever you get to them. Cheers!

[@PeterAndersons]

Thanks mate, shouldn't be too long but the cost of parts will slow me down. Cheers

[@mcfast52]

Big bore kit! make your own, Just install CB350 piston and rings, comes out to 836cc, you have to mod the piston a bit, you get a higher compression ratio to or install a thicker head gasket, give a good amount of HP and torque.

[@PeterAndersons]

See what happens... I want to get the bottom end rebuilt first then I'll take a look at the rest. Thanks for the suggestions. Cheers

[@growingknowledge]

Another quality production. Very nice sir.

[@PeterAndersons]

Thanks

[@spacystacy51]

wow. thank you for sharing. you are taking good care of it. I'm thankful for you sharing. hopefully I never need to use this information. I got extremely lucky mine ran good enough to get me to love it . just keep swimming.

[@PeterAndersons]

Yes, all good... I didn't plan for any of this, but it is fun!

[@cambo1200]

Looks like you've got a good solid engine and bike overall, should be a fun restore.

[@PeterAndersons]

Yes, there are negatives, but the foundations are brilliant, so I'm pretty happy with it. Cheers

[@sportytone1]

Not sure if they still have them, but Wiseco used to be the go-to place for pistons, either big-bore or stock. Worth checking.

[@PeterAndersons]

Yes they make terrific stuff. They seem to crop up online, but come at a premium. Cheers

[@b1g1lz]

My old man always said that every big job is just a collection of little jobs. Focus on the little jobs one at a time and the big job will sort itself.

[@PeterAndersons]

Wise words and he was correct... small subsystems combined to make a bigger one, that's how I've always looked at it as well. Cheers

[@situationmoney]

It's wild that you're doing all this without a shop manual! Can't wait to see you take apart that transmission...

[@PeterAndersons]

It's actually very easy to dismantle... all arranged brilliantly by the engineers. I did download a shop manual which I look at from time to time. Cheers

[@amphetamineblue4172]

Most 4 cylinder bike engines are essentially the same, once you have stripped down a few of them then you can do any without a manual.

[@CodewortSchinken]

The degreaser is just usual oven cleaner, I guess. My cleaner of choice for old oil, or grease is diesel. It's well working and cheap. I would also recommend to bath the engine cases in diesel for one or two days and then just brush them of.

[@PeterAndersons]

Yes, mines kerosene, but this $3 stuff was cheap and worked well, so it was all good. Cheers

[@JMassengill]

I've been waiting for this

[@PeterAndersons]

Send me some parts and I'll finish it quickly... seriously though, thanks for your comments. Cheers

[@dkruitz]

Nice project and commentary! I like your idea of loosening fasteners on sub assmbleys while theyre still mounted to decrease risk of damage later on. I also 2nd the comment below about getting a JIS screwdriver for those crosspoint screws, huge difference over using a phillips driver. Vessel 220W driver is a great start.

[@PeterAndersons]

Thanks, I'll be ordering some. Cheers

[@beedalbahgraham2981]

dkruit

[@dkruitz]

If you do, mention the JIS driver on one of your videos - you'd be surprised how many folks still don't know about those screws on Japanese bikes and bugger them up. It's like my personal mission to save the screw heads out there. :)

[@alnbaba]

Hey Peter loving the series, try ratchet strapping the engine to the bench makes life easier. Cheers

[@PeterAndersons]

I'm going to make a dolly for it sooner or later...

[@nikolaihel8106]

When you were hammering the casing to the stator you went a little hard on it. I had the same problem and did the exact same thing in order to replace the stator. I had to get the casing machined because I made small dents. Oil leaked continuously . Just a little advice. I love watching this project. CHeers.

[@ellesmerewildwood4858]

I'm watching this thinking, 263 nuts, bolts and screws ago, I knew I wasn't going remember how to get this engine back together. :o)

[@PeterAndersons]

Yes, although very different when you're doing it yourself... watching it on a screen is far more confusing. Cheers

[@whorayful]

Hi Peter all those strange numbers punched on the case and on the rods and caps is just Hondas way of identifying production tolerances on the assembly line. Crank case journals stamped B with a crank stamped say 2 would have shells installed with say a blue paint mark. It's so the final assembly guys don't need to make any measurements. Just pick and match parts, Yamaha do the same as I'm sure all others have similar systems. Ray

[@PeterAndersons]

Thanks Ray, yes I had a fair idea about that... once I see everything, measure and cross-check it all then I'll order the bits. thanks for the info. Cheers

[@DoRC]

An impact screwdriver (the kind you hit with a hammer) is really great for stubborn Phillips screws. Takes the pucker factor way down.

[@TheLowTideBoyz]

Allen heads or torx are still an idea solution

[@stihldolmar5012]

She's a beautiful peice of machinery Peter i'd love to find one :-) My brother had one an being quite heavy he accidentally layed it over while it was running. Handle bar touched the ground on the throttle side an screamed the motor. He shut it down quickly but not quick enough unfortunately. Ruined the main bearings unfortunately. We did repair it an the pistons looked like yours too all burnt ect He sold it after running the motor back in an was happy with it. You do great work mate, love your vids an when are you selling me your mint xd falcon? haha take care looking forward to all the other bike vids ☺

[@Bodi2000]

You don't absolutely need ring compressors. The barrels have tapers at the bottom and one can fiddle the rings in with fingers. An overbore to 836 will take off a lot of this taper but enough remains to get rings in by hand.

[@SuperRoo22]

would soda blasting be better for cleaning these kinds of jobs?

[@utente445588]

Thanks ;)

[@gosportjamie]

Peter, you might be interested to know that people like Mustie1 and a few others I watch have made the comment in the past that JIS screwdrivers are almost identical to proper pozidrives so a good set of them might be easier and cheaper to get hold of than a decent set of JIS, though I suppose if you're ending up doing a full restoration on the bike then having a JIS set is a good idea, especially when it comes to putting everything back together to protect the quality of the finish...

[@datasailor8132]

Have you ever thought of dry ice blasting. I saw it on a truck recently and went home to look up a video. Seems to work well for closed up aluminum structures such as transmission cases, etc.

[@PeterAndersons]

Hadn't thought of it, but would a rapid change of temperature have a negative effect of the material being blasted?

[@datasailor8132]

The blast of dry ice particles seem to melt the grime and blow it off the surface. The dry ice immediately sublimates (i.e. it goes from solid to gas without an intermediate liquid state) causing the grime to freeze in the air. There's no media residue to worry about and the grime particles can be shop-vacced away.

[@fg1972]

Hi Peter, I've been enjoying your videos over the last few months. I'm restoring an 82 DOHC cb750 and your information has come in handy thank you very much. Just a quickie question if you don't mind, in this video where you are talking about replacing the bottom end bearings yada yada. Did you end up replacing or reusing the conrod bolts? Reason for asking is that the manual does not mention replacing the bolts but there's conflicting advise around about reusing/replacing these bolts. If they were only a few dollars and readily available, then I'd just replace but they seem hard to source and when you find some, cost is $25USD per bolt not including nut which I think is bullocks. Cheers.

[@johnmcilhagga5343]

Check out Hacker Week CB 750 rebuild

[@PeterAndersons]

I did that before I bought this bike. He went away from doing bikes, but to this day I think he set the benchmark for bike resto videos, cheers.

[@jasonmolen11]

you should check the head for flatness,could be warped?

[@PeterAndersons]

I'll be checking everything mate... The head will likely need re-surfacing after welding anyway - that's if it is salvageable. Cheers

[@jdsmort]

Surprised you don't use an impact driver.. we never tried to undo the crosshead head screws without one.

[@Lawson80]

Quick question Pete, Being an air cooled engine, could you see this type of engine damage if the bike was sitting in a lot of stop-start traffic for hours on hot summer days ... ie.. using the bike as a work commuter in a heavy traffic city in the USA?

[@PeterAndersons]

I'm not sure... if the temperature was 100 degrees and you were sitting in traffic, you'd probably switch the engine off until traffic began to move. As far as this bike is concerned, it was from Wisconsin... not sure if it even gets that hot there. Anything could have happened to this bike... I'm only guessing that it was abused. Cheers and thanks.

[@bloodreighn]

why dont you see if ARP have bolts to suit your rod bolts? they do all kinds, and may be cheaper

[@PeterAndersons]

I haven't called them, but had a look at their catalogue and it's all car/truck stuff. Cheers

[@gosportjamie]

Well, that's a bit of a curates egg. At least whatever was done to trash the top end didn't hurt the bottom end. That crack in the head is a bit nasty but I've seen some pretty bad car cylinder heads successfully repaired so it should be possible to repair if your engine man knows someone who can weld aluminium and, of course, if it is financially sensible compared to the price of a new head. I wonder if it might be the result of a casting flaw as I struggle to think of a way that part of the head could suffer damage though some people do manage to find incredibly strange ways to damage mechanical things...

[@gosportjamie]

Hmmm, a 2.9 litre, 4-cylinder single overhead cam engine. That's basically what late Porsche 944 and 968 had...

[@amphetamineblue4172]

Any piston will fit if you have a big enough hammer :D

[@spacystacy51]

if it makes you feel any better I just got done with my Sunday ride. =^-^=

[@user-sh1dt8pv7h]

Haw to du in Stator working

[@malcomsue]

Shame about the engine being trashed, anything that would have indicated this other than the bald rear tyre?

[@PeterAndersons]

Yes, the whole condition of the engine... still very much salvageable though. Cheers

[@MrRockstar1968]

You could have dry ice blasted it.

[@waynepeters5948]

Hello Mr Anderson. Just for your own information, you should avoid using alkaline (caustic) cleaning products on aluminium, They aren't friends