This is a conversion that I've always wanted to do...and I finally have completed it. This is a 1986 CT110 that I grafted a honda CL90 manual clutch onto. It's fairly straight forward, but does require a few perm mods to CT110 and the CL90 parts. 1. Get yourself a CL90, S90, or SL90 engine. For my purposes I used an S90. There is an important difference between the drive plates...you need one with the larger spline cutout. Different years had different splines. One will directly fit the CT90 and the other the CT110. 2. On the clutch pack, I rebuilt mine using a honda Trailbikes manual clutch rebuild kit for a CT70 as the plates and fibers interchanged with the drive plate. So now I have a 3-plate system instead of a two plate system. For the springs, I used atc110 springs in it since that's what was laying around. I might like some stiffer springs but these will do for now. 3. I had to chop the shift shaft end off so that it works correctly inside the engine. This is permanent to the CT110 engine. I plan on purchasing a CT110 replacement should I ever want to go back. I assume the CT90 will directly interchange but the atcs will not as they are longer. The CL90 shaft is too short. 4. I had to mill the kickstart shaft through hole in the clutch cover. Based on my measurements, i used a 5/8" endmill and came right down through the center. It was a perfect fit. 5. For the seal, you will need a 26mm OD and 16mm ID seal for it. Easy enough to find. If you want to use a CT110 seal going forward, you will need to mill the seal pocket in the clutch cover out to 28mm OD. I elected not to do this as the sea was easy enough to find. Works exactly like it should. Now the CT110 is a full manual transmission with hi-low range. I elected to do this as it will actually improve driving all around IMO. On the street, naturally, the manual is preferred. On the trail, if you are in the low RPM that requires a lot of grunt, the semi will just slip as you cannot get the rpm's up. with the manual, I control the slip and should have an easier time with low speed steep climbs.