[Sod Farmer]

Can I (How do I ) adjust the idle speed on my new Yamaha 90 4 stroke? The dealer told me that I couldn't, but I find that hard to believe.

[StrykeKing]

The dealer is correct, although there is a switch for the tiller model which adjusts the rpm up to 150 in 50 rpm increments up or down. It was easily wired into my remote model, just had to lengthen the wiring. Makes it handy when docking, my boat does about 3.5 mph at idle which makes the dock come up real quick.......... Also used it for fine adjustments when trolling, before I got the kicker.

[Yamajoe]

If your motor is an EFI then correct, the computer controls idle; if it is carbs, then yes you can perform minor adjustments.

[rodbolt]

yep EFI you simply set up correctly and it either idles where its supposed to or its broke.
on lenghtening the tiller troll speed switch,
a quick read through the installation and rigging guides will show a warning in bold letters stating DO NOT lengthen the wires,
I asked why as was told it was shielded to keep RFI from toggling the ECU.
however no one really knew.
but if the manual says no I just dont.

[Sod Farmer]

Thanks Guys!