Kubota — Checking Idle Speed and Adjusting

Adjustments · Fuel injection pump / tachometer

From a Kubota service manual covering: Hurth HBW 100, Hurth HBW 125, Hurth HBW 150, Hurth HBW 250, Hurth HBW 35, Hurth HBW 50, M-25XPB, M-35B, M-40B. Check it applies to your exact model before use.

Browse Kubota generators & specs →

Procedure

1. Warm the engine to normal operating temperature.
2. Place reflecting tape on the crankshaft pulley.
3. Aim a photoelectric tachometer light at the tape to confirm engine speed.
4. Adjust the panel tachometer using the calibration pod to match engine rpm.
5. Loosen the locknut on the idle adjustment bolt on the injection pump.
6. Turn the bolt until idle speed is within standard range (clockwise increases).
7. Tighten the locknut and race the engine several times to verify.

Source: Kubota service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

More Kubota repair guides →