Carb adjustment 900 MC - - Arctic Cat Forum

Old 03-08-2007, 10:34 PM   #1
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Sled: 2006 600 XF, 2009 M8 153, 2011 M8 162
10-11 Mileage: 1586
09-10 Mileage: 2047
08-09 Mileage: 1957
07-08 Mileage: 2064
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ATV: Arctic Cat 500 automatic 4x4
2010 Mileage: 1846
2009 Mileage: 2648
2008 Mileage: 2792
2007 Mileage: 1694
2006 Mileage: 475
On a 2003 900 MC has anyone figured out how to correctly adjust the fuel mixture screws on the TM-Style carburetor? These are the white plastic screws. There is minimal information in the owners manual. I have a service manual for the 2006 model year which has minimal information on the TM-Style of ccarbs. The 2006 M7 and some of the Firecats had these style on the carb model.

The 2003 900 MC idles very rich. The left carb is set at 1and3/4 turns out while the right carb is set at 2 and 1/2 turns out on the fuel mixture screw. My instincts tell me these are associated with the idle circuit. I am also thinking of going to a smaller pilot jet.

Any thoughs or ideas?
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Old 03-08-2007, 10:54 PM   #2
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Sled: 2003 900 1M 159"
ATV: cat 300
Stock fuel screw (platic) setting is 1 1/2. I have mine at 2 as it was to lean and would not idle down. Also make sure your air screws (small brass) are both set the same, stock is 1 3/4. If you make adjustments from the stock settings, start with the fuel screw and turn it a 1/4 at a time . Ride it a bit and then make another adjustment if nessasary. I unload at 700 to 1800 ft and ride 3000 to 5000
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