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ContinuousWave: Whaler Performance
Strange idling characteristic of Mercury 125HP
|Author||Topic: Strange idling characteristic of Mercury 125HP|
posted 08-22-2003 01:39 PM ET (US)
My 2001 125HP Mercury makes a missing sound when fast idling in neutral for a cold start. When I slow it down to slow idle after it warms, the noise is gone. Even once warm, any raising of rpm in neutral causes the backfiring/missing noise. The dealer says this is a normal characteristic of the 125HP 2/4 cylinder engine. Does anyone else experience this or is my dealer mistaken?
|Jamie 20 outrage||
posted 08-22-2003 06:16 PM ET (US)
A good mechanic will hold this boat overnight so he can experience a cold start and adjust the idle/mixture screw to the rich side to get rid of what we often call sneezing. If the carbs cann't be adjusted, I would remove them and soak them in carb acid to clean the areas that are hard to clean. Then adjust them. Sneezing is never acceptable when heard regularly.
|Lil Whaler Lover||
posted 08-23-2003 07:02 AM ET (US)
Wet Foot, what is the rpm when you say fast idle? At 1,800 rpm the motor switches from running on 2 cylinders to 4 cylinders. Do not set your fast idle at 1,800 as the motor may literally become confused as to whether it is running on 2 or 4 cylinders. Try it at 1,500 or 2,000 and see if it smooths out.
If the noise continues and it is like a "popping" sound then it is too lean and the idle jets should be set richer.
posted 08-25-2003 01:28 PM ET (US)
Thanks for the input! I'm not sure about the rpm's, but will check it when out again. All I know is if I advance the throttle more than straight up neutral, the popping occurs.
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