Honda CT90 Engine Reassembly

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I have one 1971 CT90 where I was going to rebuild the clutch because the kickstarter just wasn't turning over the engine like it used too,  and I also had a Big Bore kit from DrATV that I wanted to install. My intent was to just do the top end and rebuild the clutch with new disks, but when I opened up the cases to rebuild the clutch pack I found a slick black slime in the bottom of the case.  I didn't like the idea that there could be black slime in the rest of the engine, so I decided to disassemble the entire engine to make sure I cleaned everything out.  Since I was tearing everything apart I thought I would document step by step how everything goes back together in this post in case others were interested in knowing what the inner workings of a CT90 engine look like. Links to Related Posts: My Honda CT90 Clutch and Headset Nut Tool Cut Away of a CT90 Engine - CT90 Engine Exposed! Repairing Damaged CT90 Spark Plug Threads Using a Time-Sert Thread Insert CT90 Clutch P
6 comments

DURO HF307 Tires for a Honda CT90

I was recently looking for an inexpensive all around tire and when I found the DURO HF307's in a 2.75 x 17 for only $23.12 at Cedar Rapids Tire I decided to give them a try.  The DURO HF307 is DOT approved and has a trials style tread pattern which is just what I needed for my casual around town riding.




I mounted the tires to both my front and rear wheels without any issues and think they are actually a nice looking tire.


Here are a couple of shots with the wheels and new tires mounted on my 1971 CT90 that I have removed the engine to do a DrATV Big Bore upgrade..




Overall I don't think you can go wrong with the DURO HF307tires if you are looking for an economical all around tire for use on your CT90 and I had a very good experience with Cedar Rapids Tire in that their prices are great and they shipped the tires out very quickly.  The shipping costs for the two tires and a few rim strips was $15.61, which I thought was very reasonable for a large package like two tires.

Helpful Links (Shop Manuals, Wire Diagram, Model Information, etc.)

Link to page with listing of CT90 parts available on Amazon



Comments

  1. UnknownMay 4, 2018 at 6:38 AM

    What size tire is this? 2.75 or 3.00?

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  2. MikeMay 4, 2018 at 8:55 AM

    Hi Kerry, these were 2.75 x 17. Thanks for asking the question and I have updated my post to reflect the size. Cedar Rapids Tire also carries the 3.00 x 17 of the same tire and they are actually slightly cheaper.

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  3. UnknownMay 5, 2018 at 4:46 PM

    Holy hell. I just found your blog! Just trying to get my first 90 in top shape for the season and looking at a complete rebuild of another. My new favourite internet place!

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  4. UnknownMay 5, 2018 at 4:52 PM

    Just getting my 74 tuned up for the summer. Thinking of picking up a 75 for a rebuild. Just found your blog. It's my new favourite internet spot. Keep it up!

    ReplyDelete
  5. MikeMay 5, 2018 at 5:53 PM

    Hi cwmoulding and unknown, I appreciate the comments!

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  6. Zach H.May 13, 2018 at 4:58 PM

    Hey Mike, I wanted to give you a big thank you for posting this blog. I have no idea how I stumbled upon it but this looks to be one of the best CT90 repair resources that I have seen. I appreciate the time and effort that you have invested in this blog and I know I am not alone. Keep up the great work and know you are appreciated!

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    Replies
    1. MikeMay 13, 2018 at 8:50 PM

      Hi Zach, Thanks for the comment! Working on CT90's is one of my retirement hobbies along with a number of other things including coming up to speed with creating a blog, so working on both is a win win for me.

      Delete
  7. faizanfkOctober 14, 2020 at 10:44 PM

    Good Hello I am so delighted I located your blog, I really located you by mistake, while I was watching on google for something else, Anyways I am here now and could just like to say thank for a tremendous post and a all round entertaining website. Please do keep up the great work.

    ReplyDelete
  8. AnonymousMay 9, 2022 at 7:49 PM

    The HF307's are holding up well. I have mostly have been ridding on the street and only have about 600 miles on them, but I would buy them again.

    ReplyDelete

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