It sounds like the decompression lever and lifter assembly is missing from the rocker cover? Number 6 on the parts fiche:
https://www.partzilla.com/catalog/honda/atv/1986/trx350-a-fourtrax-4x4/cylinder-head
Is your rocker cover missing these parts? Or has the cover been replaced with an 88 & 89 rocker cover, that has a hand operated decomp lever rather than a cable?
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https://www.partzilla.com/catalog/honda/atv/1986/trx350-a-fourtrax-4x4/cylinder-head
Is your rocker cover missing these parts? Or has the cover been replaced with an 88 & 89 rocker cover, that has a hand operated decomp lever rather than a cable?
Welcome to the forums!