I have several old Honda CT90's and on almost all of them the rubber boot between the carb and air cleaner had become very hard which made it difficult to disassemble or assemble these parts. I tried several methods that I found on the web to try and soften these rubber parts and finally found one using oil of wintergreen that really worked. I made a post on my CT90 blog that includes a video at the link below in case someone else was looking for a fix to this issue.
Way to soften on hard rubber CT90 Parts
Thanks,
Mike
Way to soften on hard rubber CT90 Parts
Thanks,
Mike