Where are the idle mixture screws on a 82 Maxim 750 and how do you lean it in or out Thanks?
On these carbs the adjustment screws are located on the top of
the carbs, towards the front of the bike if they are still on. They
are right behind where the choke goes into the body. On some models
of this carb they plugged the holes for the adjustment screws with
a little plug of aluminum. If they are plugged, drill a small hole
into the center of the plug (very carefully of course) and screw in
a small screws that bites well into the hole. Then take a hammer or
pliers and pull on the screw until the plug pops out.... Now you
should see your screws... beware on a bike this old these screws
may be seized and if they are at all don't force them. The screws
are brass and break easily. If they break or get stuck fully closed
the carb is trash. Believe me on this, I have ruined a set before!
The tighter you turn the screws, the leaner your mixture. Also, let
it be know that you bike uses a second form of carburation through
what is call the Yamaha Induction Control System YICS as is printed
all over your bike. This YICS system is basically a chamber on the
engine body that mixes all the mixtures of the four carbs together
before going into the engine... the purpose is for consistent fuel
mixture to all for cylinders and thus better fuel efficiency and
smoother performance. All this is great, but it makes individually
tuning the carbs almost impossible without plugging off the chamber
with a YICS tool. You can still by these online or you can find
some neat links to make one. After you plug off the chamber, hooks
some vaccuum gauges up to your vaccuum nipples on your inake boots
and then tune away... just go for consistency. Good Luck!