[Guest]

i was doing some mountain riding on Sunday in the chill of the Catskills.
my monster kept on stalling when i would slow down to a stop. i believe it is related to the mixure screws.
I have a stage 2 kit, so the screws are already showing. what happens when i turn them clockwise?
THanks,
Jerome

 

[MikeD5172]

what happens when i turn them clockwise?

Well, that depends. I've not yet opened up the carbs on my monster but I will pass along what I know. If the idle mixture screw is on the engine side of the carb then turning it clockwise will lessen the flow of fuel and lean it out. If the idle mixture screw is on the air filter side of the carb then turning it clockwise will lessen the flow of air and richen the mixture (in this location they are sometimes referred to as an air screw).

The instructions with your jet kit should have given you the number of turns to turn out the idle mixture screw from a lightly seated position. This is a baseline to get you started. When your bike stalls you should pull the plugs to see what color they are to determine where to go with the idle mixture screws (if that's the problem).

 

[ScottRNelson]

You need to know where you're at before you can set them properly.

Both my 1997 M900 and a 1996 M900 that I temporarily owned were happiest at 4 turns out. The stock setting is 3 1/2. To check, gently turn the screws all the way in, counting to see what they WERE set to, then turn them back out, counting carefully. I found it easier to count half turns. (Clockwise is in, counterclockwise is out).

By the way, on the Monster carburetors, they're mixture screws, not air screws.

 

[CRASH!]

Jerome,

the symptoms you describe are identical to those of carb icing.

YOu mention the chill. I find that temps in the low 40s with high humidity are the worst. As temps drop below 40, generally the humidity drops sufficiently that I don't have the problem.

 

[MikeD5172]

By the way, on the Monster carburetors, they're mixture screws, not air screws.

I kinda thought so. I know they're Mikuni CV type carbs but as I said before I haven't had the opportunity to take them out and tear them down. ;D

 

[Guest]

Jerome,

the symptoms you describe are identical to those of carb icing.

what does carb icing consist of? in my case, the temperature was under 40, at an elevation of at least 2000 feet. no idea of the relative humidity though.

Jerome