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BF130 low idle

Check the condition of the gasket too (part 24), as a leak there can cause issues in my experience.

It's a cheap and effective fix by cleaning #23 and replacing #24 when done together.

Old No7
 
Noticed this discussion on BF130 idle setting.
Usually idle is set while in neutral.
Can't agree more about getting everything on the intake, and with the intake sensing working & throttle-body cleaned.

Scienceninja, first question didn't suggest there was a specific idle-speed or smoothness problem. Just asking "in general", or has a situation arose with an abnormal idle scenario?

Since these are early generation digital fuel control/spark timing is thru the ECU. It does learn and needs time to settle on it's settings. Does a lot to keep idle smooth and nearest it's expected set point.
Seems, when a change like new plugs and maybe a coil & wire-pair are changed. Even a long overdue cleaning to the intake, could be a big enough shift for the ECU to need to make more than small-step adjustments. Definitely, the more mechanical timing-related stuff, like timing belts change with a valve-lash maintenance adjustments. (Did those about 3 years ago.) So, the Honda Maintenance Manual does point out a reset procedure to the ECU which is one of the steps in getting the idle speed control, while in neutral, to be on target and smoother.

Suggest to Scienceninja, the downloadable Honda BF130 Maintenance Manual might be helpful with the rather old-school digital control that helps govern the rather challenging (for the engine) smooth idle performance. Seems there are internet links to a Germany released version, which is an english-language document for the most part. {Werkstatthandbuch-Honda-BF130.pdf }

Actually, there is a figurative, rather long check list, of things which affect neutral Idle speed and smoothness. Here, is one of the basics for example, with these older mechanical cable remote controls.
I've the ~25' long remote throttle-shift cables. Making sure that the new almost to spec throttle cable actually is adjusted at both sides, to extend enough to let the throttle actually reach it's lowest throttle (correct longest cable length at the powerhead linkages) point, can't be overlooked. Seems too, there is some adjustment of when the throttle cable starts to move, after shift cable retraction, in the binical mechanism.
 
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