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Showing posts from January, 2022

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
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A 3D Printed Functional Rear Air Filter Housing for use on a Honda CT90 K2 and Later

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I have on and off been looking at trying to model or scan some of the different CT90 air filter housings so I could make 3D printed versions, but have had limited success.  Related Posts:  CT90 K2 and Later Air Filter Housing 3D Printed Seal  After some effort I was able to create a functional design of the rear portion of the air filter housings used on K2 and later CT90's.  The picture below is of the next to the last configuration that I designed and then printed during a trial fit on one of my bikes.
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A 3D Printed Seal for use on a Honda CT90 K2 and Later Air Filter Housing

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One part that is not readily available for the Honda CT90 is the seal that fits in the groove at the rear edge of the main air filter housing on K2 and later CT90 models.   I have been having success using TPU to print basic seals for other applications and thought it would be a good material to make this seal for the air filter housing. Using ViaCad Pro version 12, I came up with a design and then printed it out using TPU.  The picture below is of the TPU 3D printed seal on the left and a stock Honda rubber seal on the right.
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