Simon,
IMHO ... 60-70mph in 5th is right around 3800-4450 RPM ... or right
around where you would be getting some more assistance, (fuel wise),
from the needles if you were cranking on the throttle a little more
........ Holding a steady throttle though you are still pretty much
depending on the pilot mixture, (and of course some main mixture
sneaking around the closed slide needles depending on just how "light"
a throttle you are applying ...).
If this were an ongoing problem I would move the needles out a 1/2
click or richen the pilot mixture just a little .. but since this did
not happen previously I am assuming you are just a little plugged up
in pilot - ville as you have suggested. For this ... I strongly
recommend giving the pilot mixture holes a blast of compressed air ...
and/or a blast in the primary pilot air jet at the top of the carb,
(cover the carb with a rag if you do this at the top because fuel will
fly out of the bypass holes just above the throttle plate and squirt
straight up in the air ... in your face ... ) ...... Of course .. that
is exactly the guys we are trying to clear ............
Rey Kirkman has also posted previously that he has had success using
carb cleaner ....
Rey wrote:
"My own experience is that blowing either air or carb cleaner through
the
pilot air jet holes is not every effective to restore a clogged pilot
jet,
though it certainly doesn't hurt and you might get lucky. Better and
almost
a sure cure is Yamaha Carburetor Cleaner, part # ACC-11001-43-00. Cost
about
$5-7 for 32 oz. You drain the float bowls, and Yamaha makes that
incredibly
easy. Then a mixture of the cleaner and gasoline is introduced into
the
carbs via the hose entrance from the fuel filter. The tricky part is
getting the stuff into the carbs. I used an auxiliary testing gas
tank,
but I think a simple ketchup squeeze bottle or turkey baster would
work.
Yamaha suggests leaving the mixture in for an hour and then draining
it. I
think it needs more time, like overnight. Finally the stuff is
drained and
gas is reintroduced."
You might want to try the easy way out first, (blasting), as it
usually does suffice for the occasional plugging ... or try the
cleaner or both ......
good luck,
campbell
----- Original Message -----
From: "cybersymes" <[EMAIL PROTECTED]>
Subject: easy 'running fault' question...i hope...
> snip <
> when riding at a steady speed be it 60...or...70 mph...
> my 1988 max...hesitates then surges then stumbles
> snip <
> i replaced the in-line fuel filter and the problem has
> now appeared...i guess that a speck of dirt
> snip <
> my question is...which jet is in use while riding at a
> steady speed around 70mph...
> snip <
> ps...is there a carb cleaning 'cheat' i can use to sort
> this problem...
> snip <
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