Mikuni TM needles needle jet help? - ArcticChat.com - Arctic Cat Forum

 
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post #1 of 4 Old 01-25-2008, 12:27 PM Thread Starter
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Sled: 01 zrt 600 APV, 09 SP600
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01 ZRT 600. It has the TM 36mm flatslide carbs. I know the older Mikuni carbs had the adjustment option on the needle to richen/lean out the mixture. No such adjustment on these carbs. Do you need to buy different needles and needle jets to lean out the mixture? Anyone know how to tune the midrange on these carbs?
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post #2 of 4 Old 01-25-2008, 03:22 PM
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According to the service manual, the fuel mixture screw may be too far out, the pilot air passage may be obstructed/damaged, needle jet/jet needle could be out of adjustment, pilot jet could be loose, float/inlet needle may be damaged/obstructed/out of adjustment, main jet could be loose or too large, or the primary air passage may be obstructed.

Adjusting the needle jet is done by moving the "e-clip". Middle notch is standard, up (toward the shorter end of the needle) is lean and down is rich. Fuel mixture screw standard is 1.5 turns out from seated.
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post #3 of 4 Old 01-25-2008, 05:34 PM
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The 36 Flatslides do have a needle as well, and, as far as I know, they have the eclips with 5 slots. To lean them out, simply move the clip to the next higher slot, which reduces the needle height, which leans them out. Just move one at a time, and make sure that all three are the same.

On my ZRT 800, the clip placement makes a huge difference. When it is warmer out, it tends to run fat, and moving the clip up one notch, cleans it right up. In the really cold stuff, run it rich.

brownsleisureworld is a good microfiche reference.

Good luck.

--Monza
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post #4 of 4 Old 01-26-2008, 10:28 AM Thread Starter
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My bad. Didn't see the notched in the needle. I'll have to test out the midrange and see if I'm rich or lean. Thanks.
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