Pilot jet question for a 2002 trx 400ex - Honda TRX Forum
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post #1 of 2 Old 10-12-2019, 01:31 AM Thread Starter
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Pilot jet question for a 2002 trx 400ex

So I have a quick question, so the pilot jet the one that’s in the carb are you suppose to screw it down till it seats or is it suppose to be screwed out some ? Thank you.
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post #2 of 2 Old 10-12-2019, 06:46 PM
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The pilot and main jets are inside the float bowl - there is two screws on the outside of the carb - one it to adjust idle speed - the other on the engine side of the carb accessed from the bottom side is the pilot (fuel) screw. If the carb has the stock #38 pilot jet the initial setting of the screw is 2 1/4 turns out from lightly seated - this setting will allow the engine to start and idle sufficiently to warm the engine to normal operating temp. 10 minutes of stop and go riding is sufficient to warm the engine to normal operating temp. With the engine at normal operating temp, adjust the screw in or out to achieve the fasted idle speed. At this point set the idle speed at 1300 to 1500 RPM - turn the screw in 1/8 turn at a time pausing for about 3 to 5 seconds between movements to allow the idle to stabilize. When the idle speed drops 50 RPM, back the screw out one full turn - done.
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