This brings back memories! Some hints... Use the six-sided impact sockets wherever you can as the 12-siders can easily round off the nut or bolt. This is VITAL for the two exposed head nuts because, trust me, chiseling them out is a right bastard as they're 'sunk' into the head., Loosen off the 'loose' tappets then turn her over a bit and the remainder will become 'loose' (it isn't rocket science); nip the lock-nuts back up after loosening, it saves grief later when something's gone missing... Use the 'thin-sided' box wrench that came with the bike (hopefully) to get the number 3 plug out, that top-quality plug socket you spent so much on won't be able to get down far enough. My first strip and re-assembly took me 3 weeks (Yoshi 460 upgrade), my last took a touch under 2 hours. Such a wonderful little engine I got me another bike a few years ago :) .
Hi brilliant video. I’ve just purchased my first 400f and intend to do a full restoration like you only really worked on old British bike’s so this video is going to be a great guidance/reference thanks for taking the time to make it. All the best Paul.
I just wanted to say how much I appreciate all your work on getting these videos out to the public. Thank you so much. I will be working on my 75 400f and your videos are invaluable. Although I havent gone thru all the 400/ 4 vids I cant wait to see this engine running!
Thanks so much for posting these videos mate. I haven't stripped and redone my engine yet, but seeing someone else go through the entire process really helps. Gives me a bit more confidence that I'll be able to get through mine.
I'm doing my 400 four with you and the manual thanks lots to do cant be any profit in it but after watching your videos it's something I wanted to do well done great vidio for reference cheers
it's real easy to add a link to the next video either pasted in the live video or in the title or credits. thanks for the videos. not many have anything of real value on the 400f youtube vids except for their poses sitting on one, or how it sounds etc.
Thanks for this videos! It'll be so helpful to me. I'm looking for a Haynes manual too. I have a CB400N and I really want to make it works again by myself. Nice job man!
Those cross head screws are actually JIS heads. Get a set of JIS screw drivers and you’ll be surprised that they are actually far superior to standard Phillips or cross head.
I really appreciate your videos as i may have to strip my 400f engine, i think the primary chain is stretched as there is a lot of backlash in the drivetrain on the overrun, although at 24000 miles it hasn't lasted very long. What is the milage of your bike and what is the reason for the complete strip, it seems like a lot of work just to refurbish the casings.
The bike is showing 54000 miles and there was a lot of noise from the bottom end (normal when the carbs are out of balance) and low compression on two cylinders. As I was doing a complete nut and bolt restoration it seemed daft not to do the engine at the same time, and oh what a joy it is to assemble an engine that is so clean.
Will be posting soon a video of the completed bike. There was no slop in the drive train but some of the lash could be a poorly adjusted chain or worn drive hub bushes, I replaced all of mine.
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Thanks for taking the time to do this series, I just found a 75 cb400f and it’s my first bike. So happy your video exists.
This brings back memories! Some hints... Use the six-sided impact sockets wherever you can as the 12-siders can easily round off the nut or bolt. This is VITAL for the two exposed head nuts because, trust me, chiseling them out is a right bastard as they're 'sunk' into the head., Loosen off the 'loose' tappets then turn her over a bit and the remainder will become 'loose' (it isn't rocket science); nip the lock-nuts back up after loosening, it saves grief later when something's gone missing... Use the 'thin-sided' box wrench that came with the bike (hopefully) to get the number 3 plug out, that top-quality plug socket you spent so much on won't be able to get down far enough. My first strip and re-assembly took me 3 weeks (Yoshi 460 upgrade), my last took a touch under 2 hours. Such a wonderful little engine I got me another bike a few years ago :) .
Thanks for your comments.
Hi brilliant video. I’ve just purchased my first 400f and intend to do a full restoration like you only really worked on old British bike’s so this video is going to be a great guidance/reference thanks for taking the time to make it. All the best Paul.
Good luck with your build.
I just wanted to say how much I appreciate all your work on getting these videos out to the public. Thank you so much. I will be working on my 75 400f and your videos are invaluable. Although I havent gone thru all the 400/ 4 vids I cant wait to see this engine running!
Thanks so much for posting these videos mate. I haven't stripped and redone my engine yet, but seeing someone else go through the entire process really helps. Gives me a bit more confidence that I'll be able to get through mine.
Good job mate! A valuable reference series for anyone that's got one of these classic very well engineered bikes.
I look forward to the rebuild.
I'm doing my 400 four with you and the manual thanks lots to do cant be any profit in it but after watching your videos it's something I wanted to do well done great vidio for reference cheers
Thanks hope it all comes together for you.
Awesome stuff, thx a lot for sharing! Will help loads of people restoring their own 400F... Really great work, funny at times as well!! 💚
it's real easy to add a link to the next video either pasted in the live video or in the title or credits. thanks for the videos. not many have anything of real value on the 400f youtube vids except for their poses sitting on one, or how it sounds etc.
Thanks for this videos!
It'll be so helpful to me. I'm looking for a Haynes manual too.
I have a CB400N and I really want to make it works again by myself.
Nice job man!
Thanks mate. About to begin.
Those cross head screws are actually JIS heads. Get a set of JIS screw drivers and you’ll be surprised that they are actually far superior to standard Phillips or cross head.
Hi Matthew thanks for your comment, I did get a set of JIS drivers and I may mention that in a later video. Cheers
Replace with Allen head bolts wherever you can, it was a popular thing back in the day for a good reason ;)
@@bryn494 First thing I did when I bought my 400F in 1976 was to get replace the original bolts with Allen head bolts.
Hi hope you can help, can you please let me know the engineering firm that measured your crankcase bearings thanks
from John 😊
www.d-mengineering.co.uk/en/ Honda specialists Good Luck on your build.
I really appreciate your videos as i may have to strip my 400f engine, i think the primary chain is stretched as there is a lot of backlash in the drivetrain on the overrun, although at 24000 miles it hasn't lasted very long. What is the milage of your bike and what is the reason for the complete strip, it seems like a lot of work just to refurbish the casings.
The bike is showing 54000 miles and there was a lot of noise from the bottom end (normal when the carbs are out of balance) and low compression on two cylinders. As I was doing a complete nut and bolt restoration it seemed daft not to do the engine at the same time, and oh what a joy it is to assemble an engine that is so clean.
Is the Honda finished yet ? would be nice to see it done, maybe a video.
Was there any drivetrain slop with your bike ?
Will be posting soon a video of the completed bike. There was no slop in the drive train but some of the lash could be a poorly adjusted chain or worn drive hub bushes, I replaced all of mine.
The engine was always a bit 'sloppy' and noisy. After 20-30 minutes between 8.5-9.5K she quiets down a bit ;)
M