Honda CB750 Engine Removal | Cafe Racer Project | How To Remove a Motorcycle Engine From Frame | 04
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- เผยแพร่เมื่อ 29 พ.ค. 2022
- Honda CB750 Engine Removal | Cafe Racer Project | How To Remove a Motorcycle Engine From Frame | 04
In this episode, I removed the engine from my CB750 Cafe Racer project bike.
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When I ran the engine I could see that there were some issues. There was definitely oil leaking from the top of the engine, and it seemed like either the head gasket was blowing, or more likely the headers weren’t sealed correctly.
I tested the engine again, and I could clearly see that oil was dripping from the cylinder head. I am not sure if this is from the head gasket or some of the seals in the rocker box. Either way I am going to have to strip most of the top end.
I know that the CB750 engine weighs around 80KG or 180lbs, so it wasn’t just going to slip out. I have seen a number of different ways to remove this engine, frequently using some bar over the back of the engine with 2 people to lift it.
I have some old seat belt webbing which I use to tie around heavy items I am trying to lift. It is soft enough to hold humans so it shouldn't cause any harm to an engine.
In hindsight, I think we made this look harder than it was. Next time I wouldn’t bother using the wood. I think there are sufficient places to hold the engine without using an extra bar.
It was a bit of a struggle, but now we know how it goes I am sure we could have it out much easier. I am no more concerned about how I will put it back. I will have refinished the frame then, so I don’t want to chip the paint.
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Gloves make a heluva difference. Your hands suddenly become much stronger. Tidy your workspace, create as much space as you can before you start work and take your jacket off cyz you'll get really hot. I've taken dozens of engines in and out of bikes. Usually on my own. Good work lads.
Thanks for the tips! I have always found having helping hands around to visit is a good way to go.
Ill be doing the same thing later this month on a 1981 750 DOHC and painting the frame as you did. You looked like it wasnt too painful taking it out. Good job.
It'll still be heavy, but I believe the DOHC have a removeable front frame rail to help get the engine out. I hope you find it easy, good luck.
@@SPANNERRASH Thank you!
It's always great to see that you have posted another video and they are highlights to watch. Looking forward to follow your Honda project. Greetings from Sweden! 👍
Thanks, we really appreciate your positive comments. There's still a lot to do, so there should be some interesting videos to come.
Love a good update! 😄
More to come! Should be a great series.
Teamwork!!!
Makes the dream work! 😁
It was a really cool video! Congrats!
Thanks, there'll be a lot more to come. Hope we can keep your interest.
@@SPANNERRASH you got me already, cuz I got 2 bikes to restore: a 79cb750k & a 83cb1100fsports. thanks for ur content & keep it up. God Bless ya & family sir. From Los Angeles
@@persistencewins Awesome, it's great to have you on board :) All the best to you and yours too my friend!
When putting the engine back in, I used old t shirts taped to the frame & it stopped any scratches to the frame, great stuff 👍
I was thinking of pipe insulation around the frame, but I have seen some people mention lying the engine on it's side and putting the frame over it. Your method sounds easier, I will definitely consider it.
@@SPANNERRASH I tried that, it’s a bit bulky for the job, old t shirts or bubble wrap is the best way, wrap the frame & tape it in place, once the engine is in, if it’s hard to move, then just cut it off
@@bluehazeboy Yep, used insulation and cardboard taped to the frame rails ALL ROUND where the engine goes and not a scratch.
@@bluehazeboy Great point, thanks for the tip on that as it'll really upset me if I scrape a freshly painted frame! 😂
@@robbateman7987 Cardboard isn't a bad shout actually!
Hi Les, when you put it back in lay the engine on its side, lower the frame onto the engine and put the fasteners in, then tip the frame upright, absolute doddle and you won’t scratch the frame.
It would have been easier to remove the engine by doing similar to the above btw 👍
Thanks Mark, I really would like to do it this way. But we'll see. It's a heavy lump with the engine in the frame anyway, and I haven't as much room as I'd like. It'll be a few weeks till I get to that bit, so we'll both have to wait and see what I do :)
PS really looking fwd seeing to what you find when you strip the top end down, chances are it’ll be generally good, if you find anything wrong with the bottom end, which I very much doubt I’ve got a spare set of crank cases with the crank/gears & everything still in there.
Just tried this! Worked awesome, solo! Only next time, I will take the front wheel and pegs off. Thanks!
Good to see you got it out. That's exactly how I did it - although I used ratchet straps which you can nip up much tighter with the wood strapped under the carb side intakes - and gives you quite a bit more control. Also maybe make the piece of wood slightly longer so you can have one person each side of the bike and feed the engine through while both supporting the weight from both sides. Look forward to the next installment. By the way - can I ask what model bike stand that is and do you recommend?
We made heavy work of it, and we're not sure we would bother with the wood next time. But really need to think about how it will go back in. But we are a little while off from doing that, plenty to do with this bike.
@@SPANNERRASH Seen a few ratchet strap long wood to barrel under inlets and made the job a lot easier.
@@robbateman7987 That seems like a better way to position the wood, thanks for the tip on that. Next time I'll try it that way. :)
Possibly heads been off and reassembled without a new head gasket but who knows I’m just an armchair mechanic. Great video👍🏻
Pretty sure the head has been off, the gasket looks new. I am hoping that it is either the O rings, or the pucks under the cam holders, not being put back right. Busy with the frame and some other things at the moment, and I've been riding my other bikes well, it'd be a shame to miss out during the better weather. Can't wait for it to get back to the top of the list so I can find out, though.
Its NOT possible to remove / refit either the cam cover or the cylinder head from the motor whilst in the frame on a cb750.
@@mikeford5106 Generally true, I've seen people modify the frame to get around it, but I think that's a bit over the top. 😂
why do you say "it definitely wet sumps" when you drained the oil? because of how clean the oil was? how smooth it drained? cheers and thank you
There wasn't anything wrong with the oil. Wet sumping means that when the engine isn't running the oil drains from the oil tank into the sump. There will always be some oil in the sump, but when the engine is running this should be pumped back up to the tank and the sump will only have a small amount of oil. The oil pump shouldn't really let the oil leak through it when it isn't running, but most do to some extent. On a CB750 this doesn't seem to be a problem, but on some other bikes you can get some of the oil from an overful sump being pumped out of the engine through breathers which can be messy. This engine altough it does wet sump isn't doing it to such an extent that it is a concern to me. I hope this helps.
Great channel, are you still wanting a 4 in to 4 exhaust? I have one that needs to go asap or it’s probably going to the dump
Hi, Qwerty' where abouts are you? Maybe contact me through the spannerrash.com blog or our email.
I could be very interested, but if it is one foot out of the dump, maybe you are telling me it is too far gone?
@@SPANNERRASH hi, they are good condition, but just bought a 4 in to 1 as prefer the noise. Will send you some pics on that link you sent later
I just removed a 4 cilinder myself. The question is now, as it is very heavy, how do you work on it? Just from where it is lying on the support on the ground? How do you do it ? I'm trying to figure that out lol
It is a heavy old lump. The stand I used is really good. I reviewed it in this video th-cam.com/video/IYV1upwjWPU/w-d-xo.html
hey man! what kindve wiring harness do you have ?
Take a look down the playlist for more info on the electrics. I am fitting an M-Unit, all of the wiring will be custom. It's starting to look really good.
@@SPANNERRASH I want to sort my wiring out an I don't know what size it is can you let me know is the 750 fn2 thanks