After spending some time in thought about this, I suggest that a careful
examination of the choke mechanism be made. If memory serves me, they use a
spring to close the choke butterflies and is not a direct cable action (or an
enrichener as the bigger bikes use.) It may be that the choke does not work at
all. Some have "windows" in the butterflies and some use an external spring to
close them. I have seen the tiny springs on the "windows" break and cause VERY
hard starting. On the external spring setups we used to carefully add an extra
turn on the spring to insure choke closing (this was done mostly on the V-twins
like the GL500's) The early NH 450's had extremely lean carbs and that doesn't
help any.
FYI: the spring is used to allow the bike to get "enough" air when starting and
not foul plugs. If the motor is reved with the choke closed the springs/windows
take a real thrashing and break. I don't recall which system is used on that
particular bike but the real issue is that parts would not be available. Should
my dianosis be correct and parts needed, I will try my best to help.
My best suggestion, hope it is of help.
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