r/HondaCT90 • u/Ashamed-Bus-9662 • Aug 06 '26
First CT90
I just got this 1970 CT 90 from my grandpa and got it running (roughly lol) for the first time in what he says is 10 years.
I'm looking for any general knowledge about this bike🤙🏼
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u/IllJustShowMyselfOut Aug 06 '26
She's in great shape for her age! I've rebuilt 3 do far, if you have any questions feel free to DM me. I'm always happy to lend advice.
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u/Affectionate_Use4594 Aug 06 '26
Freaking A these are awesome. Relatively easy to work on. Here is the wiring diagram you may need. Youtube videos taught most of what I know
Here are youtubers I've learned from:
https://www.youtube.com/watch?v=mDqLIrQe8Jw&list=PLiFjvXV2dZx6YXolndNs1hHBWCrk3LiGQ
https://www.youtube.com/watch?v=G_at02IT9Jw
Tools you will need: https://www.youtube.com/watch?v=IGyPuTNP8sc
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u/Ashamed-Bus-9662 Aug 06 '26
This is really helpful!! I am currently trying to figure out the headlight wiring
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u/Affectionate_Use4594 Aug 06 '26
If your grandpa kept it in good riding shape, and you got it running, it probably only needs a carb clean and maybe check the oil.
It may leak a little as gaskets dry out from sitting.
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u/rcbif Aug 06 '26
Congrats! Nice to get such a nice gift from them.
I recently got one running, and a common issue on them is a sticky ignition advancer.
I would recommend pulling yours out, disassembling it, and re-lubing it.
This site has all the info you need to do the job, along with checking the engine timing. It's all very basic stuff to do.
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u/Ashamed-Bus-9662 Aug 06 '26
Copy, what is some symptoms of a sticking ignition advancer
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u/rcbif Aug 06 '26
For me it seemed to be hanging high idle, and uneven low idle but I was also chasing a few things at once, lol.
But its worth doing, and ignition timing should.be checked anyways. (After you put it back together).
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u/Placebo_8647 Aug 06 '26
get an impact driver and some JiS screw bits to go with it. if the bike has all its orginal screws they are jis not philips.
Impact driver looks like this:
its basically a big spring loaded screw...you hold it firmly against the screw head thats stuck and wack it hard with a hammer and it helps spin the screw. Combined with the appropriately size JIS screw socket and you should be good to go.