When I bought a running ct90 I said, no projects! Right from the gitgo it was a project, however I am enjoying it. Excellent straight forward instructional, Hopefully you have more on the ct90. Thanks!
what a legend. so many videos just skip through the little bits that i was really struggling with and yours was concise and not rushed. Thank you for the clear explanation. I was able to dis-assemble my 110ct today thanks to your video!
Just so people know, most of the philips head screws are #3, if you use a #2 odds are you'll strip them. I personally wouldn't use a drill either, I'd use an impact driver for it all, with an impact driver you are less likely to strip the screw heads and with most of these engines being 40+ years old they free the screws much easier. Great video though, very informative.
Yes. If you are removing the rocker shafts to access the valve springs, there are delicate cooling fins all around the three #3 philips screws that hold the cover down. This cover keeps the rocker arm shafts from sliding out and also guides oil to the rocker arm shafts. If you want to remove the valves, you must take this cover off and I recommend a hammer style impact driver with a #3 philips impact bit. Getting a wrench on the head of the screw is not an option. :] I love this video! I saw a video from this channel a while back and was really impressed by the step-by-step instructions. I finally found your channel again! Glad I subscribed. Saved me so much time!
Nice vid man. Before doing this, make sure the crank is at top dead centre, you can tell when it's there by checking that the valve rockers both have freeplay at once. Also, a tip I've picked up is to use a small zip tie to tie the timing chain to the cam sprocket, takes the stress out of having to hold the sprocket and chain all the way through the disassembly :)
Hello, internet friend. I'd just like to tell you that this video was very helpful to me and had a great pace for an informative instructional disassembly! I found myself talking to and agreeing with you halfway through the video. Thank you for walking me through this process at a wonderfully slow pace! Great video!
Hey man, I almost never comment on videos but wanted to thank you for this. Really awesome and straightforward information. I actually build furniture for a living but work on motorcycles as a hobby. I’m 29, and rebuilding a ‘72 CT90 because I grew up riding one. Your video was immensely helpful and I felt like I should sign in to RU-vid haha. Just so I could thank you. Great video.
Good video. i'd recommend using Japanese Industrial Standard screwdrivers instead of Phillips head screwdrivers. The Phillips "cam out" the heads on the screws, ruining them over time. You can see the the screw heads starting to cam out in the video. Almost every old Honda I work on has damaged screw heads.
And for those who can't get real JIS screwdrivers, at least use a manual impact driver (the kind you hold with your hand and smack with a hammer). That will keep the philips from camming out.
Your video was very, very helpful. I referred back to it numerous times and it was so helpful. Thanks for speaking in lay terms and being detailed. You make it look so easy. Thanks again.
Many thanks there, chap! That was crystal clear. Excellent. I was a bit on edge taking my engine apart but your clear pictures really showed it so well! Now I can do it with hopefully no unhappy surprises. Good job.
Excellent basic tutorial, now I can look at my top end while the shop manual is on the way ! THANKS ! I could add however after 52 years of working on Honda motorcycles, that before cordless drills, a Hammer Impact Driver is #1 basic required tool. In fact the hammer impact driver should replace the "Chicken Wing" as the tank emblem ( like the tuning forks on a Yamaha logo 😄) oh yeah PS it was the Cylinder (not the bottom part of the head)
Thanks! I was looking for instruction for taking apart the top end of a CT90/CT110 engine and this was all I could find. Very good and covered all the basis. And the suggestion to mark the timing sprocket yjr edvanhal made is right on.
Josh Barbra Just picked up a 70 ct90 myself and am going to likely have to do a rebuild. Just learned it has low compression and will also only go into low so I’ve got some work to do. Have you done yours yet
@@mattdlmn not yet, I ended up putting a Lifan 140 4speed manual motor in it. I'm going to still rebuild the other 90 engine soon for another ct90 I'm working on. If you're on facebook, check out the CT90 owners page! Lots of awesome info.
Josh Barba sounds cool, I’ll have to check that motor out. I dropped my Facebook many years ago but my wife is there so I’ll have to have her check it out. Undecided at this point where to go next but I’ll figure it out.
Thank you for the great comment! I know what you mean I seen videos that don't show you parts of the video that they just skip to another part and you don't know what to do for that part that you need to know if you don't know. That why I try to show every step that is needed so that it is clear to understand all the parts of the video and not leave parts out of the video. I am glad to hear that it is by far the best video. I hope you get your motor fixed and running again.
Very nice video, please make a video of complete engine rebuild, means dissassembling and assembling from top-end/clutch/crank cases, Crank rebuild how to check oil pump and how to clear lines etc on Similar C70 engines with CDI ignition. would be very helpful of you
Your crystal clear method reminds me of a VW repair manual we had decades ago called VW repair for the complete idiot! By John Muir. A step by step guide that was so clear that anyone following his instructions could rebuild an old upright engine. Such a manual for ct90 110 etc would be very popular.
Man, thank you so much. If it wasn't for your perfectly laid out sequence, I would have had trouble getting my engine work done. Thanks for the great videos
Great job. One thing you should note is Honda's do not use Phillips screws. They use JIS which looks similar but if you use a Phillips, you will booger/strip the screws
So glad I found this video. Need to do a top end rebuild and decided to do some research before jumping into the head removal for the first time. Definitely subscribed
I watch your videos because I'm a new trail 90 owner (sadly with low compression) but also your other vids because I freakin' love the intro music. And I like your bikes!!! BRRRAAAAAAAPPP BRAAAPPP!!!!
Yes this can be done while on the bike. I just removed the motor from the bike to make it easier to film and show the viewers the steps on how to do a top end.
all I need to do is change out my valve seal so im going to stop after taking the head off did you ever make a video showing how to remove the valves im sure I can figure it out, but always nice to see a video
I'm assuming that the sprocket/chain have to remain on the proper tooth because of timing? Could you use a little zip tie through the center of the sprocket to hold the chain on so you wouldn't have to worry as much?
Yes the sprocket and chain have to remain in the on the proper tooth for the timing. There should be two markings one on the sprocket and the other on the casing to align the timing. you align the two markings. You could also use a zip tie to hold the sprocket and chain.
Did you keep the sprocket on the timing chain so that you didn't have to adjust your timing when putting everything back together? Im new at this and that seems like thats why you would do that.
Yes that's why I did that. So it would be easier to just put back the sprocket and not have line up the timing on the sprocket before reinstalling it and the timing chain.
Sorry I do not have a list of the parts. It should be easy to find the parts maybe check with your motorcycle dealer they might be able to look up the parts and find the part numbers and you can order the parts off Ebay.
I hold it because if you don't hold the sprocket it could fall and the timing chain could go in the motor and it will be hard to get the timing chain out of motor.
yeah that happend to my not a big problem easy to get out the real problem is to get the timing right when you put it back together. any tips on how to do that.
Great video! It really helped me. Thanks! Hey, in the beginning when you're riding... it looks like where me and my son ride... is it Carnegie? Thanks again, Jim
Hey nice video . I have a question for all , I have a 82 z50r similar engine but smaller . Does anyone have any experience with these eBay Chinese complete heads ? I need a new head and can't find an oem Honda head . Any experience with aftermarket heads ?
You might have a bad head base gasket or you might need new o rings for the top end. Also you might have over filled the coolant. You might need to drain the oil and put new oil in the engine.
thats okay I have the pdf service manual I can probably figure it out, I know the top needs to be compressed so some little locking tab needs to come out or something
You need to drain the Gearbox oil and then put fresh oil in. Also, you might want to try to drain some coolant out little by little until it stops leaking.
I wonder fellas, seeing as these old bikes are so similar, do you think it's possible to put a 50cc trail engine on the body of a 90? I could ride it around on a moped sticker that way. Wuddya say?
You can see the photos with out an account just go under the video description (and hit see more) and click the link to my Facebook and you should see the photos on how to remove the valves.
Sorry I did not make a video on taking out the valves. If it will help you out I'll upload pictures with the text about how to remove the valves from a motorcycle manual that I have on to my Facebook at Braaaplive2strokes.
