135 fuel mixture solenoid? Vapor lock?

I have a new to me 135 with a Perkins gas. This has a zenith carb which uses a fuel solenoid upon shutdown. It seems like the tractor is.
Running a bit lean though. Is there a way to adjust the "load" jet? I can't figure it out since the solenoid is where the adjustment would be on
any other tractor? The carb was rebuilt and runs perfect otherwise.

Also, if I run this tractor hard bush hogging in hot weather I will get vapor lock from fuel boiling. I do not have a heat shield between the
manifold and tank, but I've never had to deal with this before. Any help will be appreciated.
 

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