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West Wight Potter Mailing List maintainer
dfarrell@ridgecrest.ca.us
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Curt Westlake wrote:
> Here's my problem. My year old Nissan 5 hp 4 stroke is having problems
> running on idle. It keeps dying. At full throttle it seems to work
> fine. I had it serviced just a couple of months ago and it has been
> working fine.
> Any tips? Could it be bad gas? I topped off my tank Saturday afternoon
> prior to experiencing the problems Sunday am. Thanks in advance.
Sounds like it could be dirt in your gas. Idle jets are small...
First, get fresh gas and a fine strainer funnel. If possible up-end
motor or otherwise pump / flush out existing gas and replace it with
clean, fresh gas. If possible (and if it is not a diaphragm
carburetor), remove float bowl and check for dirt problems there. Be
careful of float bowl gasket. Some tear easily. Wouldn't hurt to
make sure you can get replacement gaskets before starting this
project.
1. Find manual if possible. Get access to idle jet adjustment. As
we go thru the following steps, remember two things: "Gentleness" and
"Counting".
2. GENTLY screw jet adjuster all the way closed, COUNTING turns as
you go. STOP tightening it at the FIRST sign of resistance. The idea
here is to dislodge any dirt that is obscuring the orifice. If you
crank it down too hard, however, you may damage the jet, so be
careful.
3. Back adjuster out the same number of turns as you counted as you
were closing it.
4. Secure boat along side dock, or put the motor in an exercise tank
(55 gallon drum will work).
5. Start engine at mid-throttle, and see if idle problem is cured.
6. If problem persists, repeat the close-open cycle again, with the
motor running.
7. Next, GENTLY try opening the jet to twice the number of turns that
it took to close it. Stop if you feel any resistance. This may allow
the dirt to be sucked thru the orifice. If this does not produce some
signs that idle behavior can be improved by this method, reset the jet
to the original number of turns, and stop here.
8. With motor warm and running at progressively lower speeds,
fine-tune idle adjustment.
Good luck. Hope this helps.
-- Robert Skinner, Rockville, Maryland '87 Potter 15 HMS #1618 "Little Dipper"
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