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Old 10-07-2005, 03:37 PM   #1
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t-maxx carb

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does anybody no the factory setting on carb for the 2.5 engine traxxas
t-maxx please help thanks
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Old 10-07-2005, 04:11 PM   #2
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The 2.5 engine calls for 4 turns out from stop for the high speed needle.

The low speed needle is around 2 to 2 1/2 turns out from stop. However, realize that you'll adjust the low speed needle once you have the high speed needle adjusted (engine fully warmed up) and the "pinch test" of the fuel line is what will determine if you have the low speed needle set correctly.

With the engine full warmed up.....that is when you actually begin adjusting your needles. Do the high speed needle first....do a few high speed passes....if the engine bogs down...or cuts out....it's to lean and you'll need to turn it counterclockwise 1/8 turn. Try another few high speed passes and check for performance....it it's still bogging down....turn the high speed needle 1/8 turn counterclockwise again....and test again.

Once you have that setting correct....then you'll test the low sped needle simply by pinching the fuel tubing gong to the carburetor. What you want to see/hear...is as soon as you pinch the tubing....it should take the engine between 3 to 5 seconds to die. If it's longer than 5 seconds...then you'll need to lean the needle by turning it in 1/8 turn.....then do a few high speed passes and try the pinch test again. Do this until you have the engine cutting out at the 3 to 5 second interval.

If your engine is idling to high....make the adjustment with the idle screw listed in your instruction manual. Follow the directions there and you'll be fine.

Good Luck!
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