Don't know if this is relevant?
Worked on an Oliver super "88" diesel some years back for a friend, ----well maybe 30+ years.
It would start fine when cold and work all day, but don't shut it off, or you had to use Either to start it.
A new set of pistons/ rings/sleeves cured that problem.
I do know she was still working fine 6 years ago when sold.
Does your cub-bota have excessive blow-by out the crankcase breather,
and/or high hours?
If so, that would be a sign she is "tired"
other wise maybe a valve adjustment is needed?
Is the battery up to par?
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