Idle rpm not steady? By gingel (Read 982 times)

[gingel]

I have a 125cc scooter, and i also have a simple tachometer from ebay.
After the engine is warm, i noticed that sometimes the engine idle rpm could be 1500, and then after riding a while and
stopping again, the idle could be around 1740.
Then after more riding and then stopping, the idle may go back to 1600 or 1500.
What ever the idle is at a given moment, it stays steady.

I don't know how accurate this tachometer, but you can also notice the change of the engine
sound when the rpm is lower or higher.

Is it ok for the idle rpm to play between that range, or should it be exactly at 1500 or 1700.

Thank you.

[Alleyoop]

It is fine, moving around about 200 rpms or so, its the heat and amount of air it is sucking in at times that throws off the idles. But if it keeps bounceing up and down it means it is a little LEAN and you will need to RICHEN it up a little by turning the Fuel Ratio Mixture Counter Clockwise a little.
Alleyoop

[gingel]

The idle itself is steady, i mean if it's at 1500 then it stays at it.
If it's at 1700 then, it stays at 1700.

So it's normal for the idle to play +-200 from stop to stop?

[Alleyoop]

Yes it is normal, even cars will not hold the idle after they get heated up. Your fine.
Alleyoop

[gingel]

Thank you.