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Thread: CT70 fork oil

  1. #1
    CT3
    CT3 is offline 70cc
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    CT70 fork oil

    What is the correct weight?

    Thanks..

  2. #2
    No1Banana's Avatar
    No1Banana is offline 120cc
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    What year do you have? Some of these forks are so basic they don't need oil.

    Oil weight depends on the style of riding you do, and your personal preference for suspension feel. I like a 5 wt. oil in my mtn. bikes. But I only weigh about 190 with gear. And this is riding downhill with jumps and shit.

    But I bet a 5 wt. would feel pretty nice in a fork for these CT70s too. For me at least.
    - Americans For a Better Banana - Founder and CEO

    '70 K0 CT70 Candy Ruby Red
    '66 CL160 ~currently in a box~
    '73 Honda CB450

  3. #3
    CT3
    CT3 is offline 70cc
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    It's for my k1. I'm 185 pounds. This bike will be used to drive at the campsite, to the store and friends house. No off road, that's what my xr is for.

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    No1Banana's Avatar
    No1Banana is offline 120cc
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    I think more importantly will be the cc's of oil in each leg. That will prevent the fork from bottoming out when you jump over your friends cat while driving back from the liquor store, with 6 handles in your backpack.

    I have no idea how much oil is used in the legs of those forks.
    - Americans For a Better Banana - Founder and CEO

    '70 K0 CT70 Candy Ruby Red
    '66 CL160 ~currently in a box~
    '73 Honda CB450

  5. #5
    racerx's Avatar
    racerx is offline Super Moderator
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    FWIW, I like 15wt fork oil in these and in slightly greater quantity that factory spec. If you're a bit adventurous, try filling them per the manual, then adding an extra 5cc, installing the cap and testing the fork action. When you feel it just start to tighten up near full compression, stop adding oil to that side and top-off the other side with the same amount. This kind of "tuning" can make a substantial improvement. Done this way, the K1-`79 fork is better than most riders probably think. FYI, I torture the scale at ~185 lbs, too.

  6. #6
    snooter is offline 120cc
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    go with racers advice..15w modern oil will make a huge difference in front end "feel".(i run 20wt)...the "add an extra 5cc" is an old racers trick from the old days...its been done for years and is a very cheap and inexpensive way to increase front shock performance..beyond the "5cc trick" your into shock rebuilding (modified spring rates/bushings/etc) and buying machined internals which improve shock performance....(basically angle is changed on internal fork cylinder-there is a hodaka kit upgrade for you hodaka guys)..all in all honda front shocks are a very good and reliable set up for there intended purpose (kids at 100lbs)

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