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!
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!
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 :)
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 TH-cam haha. Just so I could thank you. Great video.
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)
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!
Just so people know they ARE NOT phillips head screws. They are JIS (Japanese Industrial Standard screw) People foolishly use philips on them and wonder why they get stripped out.
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.
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.
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
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.
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.
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!!!!
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.
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
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
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.
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.
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.
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.
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.
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 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.
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.
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 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.
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?
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!
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!
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 :)
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 TH-cam haha. Just so I could thank you. Great video.
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.
You got me kid. I actually learned something. Thanks for posting.
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)
I love how thorough you are in this vid, thanks for the help 👍
Exactly what I was looking for. Thank you.
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!
Just so people know they ARE NOT phillips head screws. They are JIS (Japanese Industrial Standard screw) People foolishly use philips on them and wonder why they get stripped out.
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.
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.
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
Thank you drachir. I am glad that the video helped you with you engine.
Very detailed walk through. I've been nervous about doing this. Thank you for the tutorial. Well done
Well done! While getting ready to do mine I have watched several videos and yours is by far the best, great camera work and well organized. Thank you.
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.
Great video! Just picked up a 1970 CT90 today. I will most likely be replacing the rings soon and this will be great help. Thanks!
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.
Hey man, I have an SL70 I've been looking to get the top end off, thanks so much for this video! Best on youtube by far!
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
Great video, I have 3 CT90's never took a head off but I could do it after watching this. Good Job and thanks for sharing you knowledge.
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!!!!
Awesome video. Well done!
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.
Well done my Man. I have the confidence to start a tear down on my 2 CT's I bought last month
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
Incredible video. Great step by step instructions!!!! subscribed
I am glad to hear that it is a incredible video. Thanks for the comment.
Thanks from England. I didn't know how to remove the timing chain. Back out to the garage
Dude thankyou for the insight. My ct90 is burning oil and i need to disassemble and diagnose.
Should I have it on tdc when doing this? Great video. Doing this tomorrow
Excellent, informative, and interesting video! THANKS for sharing!
A suggestion, put a small mark on the sprocket and chain for reassembly in case they are moved or dropped. Thanks for the post! Eddie V
Im taking one apart, came on a snag, found your video: thx! good work.
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
You gave a very good video. Now I can do my CT110 is the same as the CT90 .
Thank you.
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.
great training video. you have a talent for teaching. your video was, and is, a pleasure to view.
nice job buddy! It most definitely helped me out. thank you
Thank you. I am glad it helped you out.
Pretty nice video. Would like to see the complete disassemble, piston, valves, gears etc. Thanks for teach.
This has helped me a lot...thanks
GREAT VIDEO, IT HELPED ALOT. I LIKE THAT I WAS'NT RUSHED THANKS.
Good job. I am doing the same on my 1990 XR200r and so this was very helpful.
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.
I AM JUST ABOUT TO DO THIS, THE VID IS PERFECT. THANK YOU
Perfect video.!! Thank yoy
Nicely done, very clear instructions. Thank you.
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.
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. Do you have a list of all parts need to properly do a top end on a worn engine? Thanks
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.
Thank you for sharing. Very informative. Keep up the great work!
Good Job!! Keep it up!!
nice job
What a great video! Your the man!!
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
can you put a CT110 cyclinder on the CT90 bottom end?
Awesome video!
Well done my friend well done. You can tell you e done this a few times.
Yes I have done this a few times. Thank you for the great comment.
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.
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.
Cheers for the video mate.
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
Thanks dude! You are a lifesaver!
Always nice to save someone’s life.
You should be forever grateful.
Good Video, thanks
Excellent video! Thanks!
Thanks - very good instructor!
Well done. Thanks!
Thanks you for the comment! This means so much to me! I am glad that you liked the video.
great video. very helpful!
Big help... Thank you
Great tutorial, good work!!
awesome video!
great video dude !!! Big help
really helpful video man thank you
Nice job very informative
Hi, why there are 3 acorn nuts and one regular nut on the cylinder studs? and why does the regular nut have a copper washer under it?
the acorn nut with a copper washer is the one that allows for oil to get to the head
Great Job!
Yes it would be okay to replace the rings while the engine is on the bike.
The part where you loosen the valves, is that necessary to remove the top end? Or can you leave them as they are?
If you don't loosen the valves before hand, you won't be able to remove the camshaft.
im guessing this can be done on the bike?
Do you know where I could buy a kickstarter shaft for a 1970 Honda ct90 trailbike?
well done. thank you!
Nice job! Thank you.
thanks for the vid very helpful
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 ?
Good video. Just need to learn the names of the parts, like cam, and cylinder and junk like that. But good video
Awesome Vid!!
Thanks,
God Bless!!!
You should really address/show how to ensure TDC before taking it apart. Pretty important step.
Great job!!! Thanks!!
great job!
good job
Good video dorg.
Roof roof.
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.
Thank you good job
well done bro thanx
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?
Yes it should be very easy just drill some mounting holes in the skid plate and get a good spocket and your good to go
I upload the photos just in case if you want to look at them. They should be up on my Facebook in a few minutes.
how do you set the time on this old thing?
Thank you!
Thank you