ALWAYS Do THIS on Old Honda Motorcycles - 1968 Honda CT90 Centrifigual Filter and Oil Change

Retro Grade
Retro Grade
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Published 2024-02-01
This footage of Brock cleaning out the centrifigual oil filter on his beater 1968 Honda CT90 has been sitting on a hard drive since this summer, so we figured we'd finally make use of it and spend way too much time putting a video together! While these aren't always that dirty, if they've never been checked or cleaned in the bike's history it's a good idea to tear into them and be on the safe side! While this procedure was performed on a CT90, the basics of these filter types on old Honda's and the disassembly/cleaning procedure are generally the same.

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All Comments (18)
  • @HayabusaGSXR-cv6ig
    Excellent video and a well explained procedure to those who seam to think 🤔 there isnt an oil filter and its peace of mind that you know your filter system is cleaned its probably a good idea to change your oil more regularly to limit the amount of times its necessary to remove the side case and having the gaskets instock when putting it back together. Thank you for this guide 😉 😜
  • @Robinsbro17
    Great video..Thank you for posting as this is a task I need to perform this Spring. Thanks again.
  • @SSOMMERHOFF
    Nice video! Just a suggestion: to properly measure the oil level, don't screw the dipstick.
  • @RobertHatfull-df4ch
    I used to take the engine out and lay it on its side to do this aint done a cub since the 80s kinda took me back .
  • @BradenMcCandless-bs7tc
    Thanks for the how to. I'll do that when I get the gaskets. though I was unable to find it on Google until I searched clutch outer cover gasket on the small one.
  • @bewilderment9268
    At the end, when you went into gear, it looks as if you need the rear hub rubber shock dissapaters replaced.
  • @megastick9324
    The side cover has the oil grade stamped into it. 20 below a certain temp and 30 above. Though running multi grade won’t hurt anything really, I prefer to follow the OE instructions on lubes and fluids, it’s what they were designed to run.
  • @tauncfester3022
    Just to add: Most of the Honda twins of this era also used a centrifugal filter, as do a lot of presently made Chinese clones including the CG125 based upright singles. Also note that loosening the right side footpeg's bolts requires you loosen the left side while removing the right side's. Trail 90/110's also benefit from removal of the skidplate.
  • @mikes-mz5xb
    I have the same bike, and the same johnson seahorse. Both great machines
  • @garygullikson6349
    We have feral cats that sneak into our garage. BTW, other UY'ers suggest checking/replacing clutch disks while in there. I think I may have a defective shift star stopper gizmo making shifting sticky. Getting up courage to rip into engine, find parts, '68 KO parts are scarce.
  • @pujabelgian
    I bought a ct90, spent 2 weeks dismantling the top end, adjusting valves, messing with points, timing, disassembling the carb trying to get it to run right, took the clutch cover off, cleaned the screen, had a helluva time getting it back together, then it spit the plug out so I needed to take the head off again for a helicoil, back together and thought, why did I buy this thing? I obviously hate riding. 😄
  • @CharlieRice-eq5hb
    I just brought home a 1981 Honda Passport 70. I imagine the same thing needs to be done to my bike. Same procedure?
  • @Me0wkerz
    I have the same bike, it sat for a long time in my grandpa's barn. I think the electrical's are broken. Anywhere that I can take it to get fixed?
  • @cerealtiller
    The original Screws were not Phillips type..they were JIS
  • @Philip-hv2kc
    You just had to include that music or whatever.