Governor Arm Shaft GHG1768895

Replacement Governor Arm Shaft.

Roary the Repair Lion says:

This part controls the speed of the engine. If your engine is revving, please check the following before opening the engine casing:

 1) Check the spring on the Governor Rod. This is the rod that goes from the top of your carb to the governor arm. Check if the spring is broken, becomes slack or has come off at either end. Replace if necessary.

 2) Check the Governor Arm spring. This sits between the engine and the governor arm. Replace if necessary.

 3) If step 1 & 2 has failed then your governor will need resetting. This is a complicated job, and we suggest is only carried out by a mechanically minded person. (You will need two people)

A) Person 2 - Pull governor arm to the far right.

B) Person 1 holds, with a pair of pliers, the governor spindle that protrudes from the engine, while Person 2 loosens the retaining bolt on the governor arm and lifts the governor arm straight upwards until it comes off. Do not turn the governor spindle while doing this.

C) Person 1 rotates the governor spindle as far clockwise as the spindle will turn.

D) Person 2 replaces the governor arm again in the far right position (throttle completely open) and tightens the retaining nut.

4) If the above steps haven't solved this, you will need to open the engine and replace the Governor and/or the Governor Arm Shaft. Take apart the engine and investigate.

Things to check before purchasing this part:

Opening the engine can cause damage to the following parts. It is highly suggested you check these parts as they also might need replacing: 

1) Check both oil seals - There are two oil seals. Each located at either end of the crankshaft. When you remove the crankshaft or remove the seal, they might get damaged and need replacing. A damaged oil seal will leak! Replacements are available on the model page.

2) Check the second bearing in the side plate for damage - Replace if there is any play, wobbling, is hard to turn or are any noises when turning. These are sold separately on the model page.

3) Be sure the camshaft decompression weight moves freely, and springs are not worn out. Clean or replace if necessary. Replacements are available on the model page.

4) Check gears on camshaft and crankshaft for damage. Replace if necessary. Available to purchase on the model page.

Rebuild Tips:

When replacing the Governor Arm Shaft it is advised to fit a new Gasket Kit to ensure the engine is sealed correctly. The Crankcase gasket should never be reused.

A) Always oil all internal parts as you install them. Do not oil the gaskets or oil seals.

B) Fit the oil sensor. Be sure it is sitting in the groove correctly.

C) Install the governor and governor Arm shaft. Be sure the governor clip, and the split pin on the arm, has the flat side to the groove. Next install the arm washer on the arm shaft.

D) Connect the piston and the con rod. The "spike" on the con rod and the triangle on the head of the piston should be pointing in the same direction.

E) Install the piston with the triangle pointing down towards the push rods hole. (If new piston rings are being fitted, please see instructions on the piston ring page prior to fitting in the engine.)

F) Install the crankshaft and attach the con rod with "spike" pointing downwards. Torque: 12 N·m (1.2 kgf·m, 9 lbf·ft)

G) Install valve lifter tappets just before fitting the camshaft.

H) Install camshaft. Be sure to line up the punch marks on the crankshaft and the camshaft. If you do not do this the spark plug will not fire at the correct time and 99% of the time causes extensive damage to the internal working of the engine.

I) Using the new crankcase gaskets replace the side plate. Do not reuse old gasket! Torque: 24 N·m (2.4 kgf·m, 17 lbf·ft) 

J) Carefully insert oil seals. Do not oil the oil seal prior to installation.

K) Fit the flywheel. Torque: 75 N·m (7.6 kgf·m, 55 lbf·ft)

L) Replace oil drain bolt and refill oil. Torque: 18 N·m (1.8 kgf·m, 13 lbf·ft)

M) Once the engine has been fully rebuilt, set your Valve Lash Clearances to 0.015 inches OR 0.4 mm for both Intake and Exhaust. (If not running correctly, open the exhaust to 0.020 inches OR 0.5 mm).

You will need a Feeler Gauge to set your Valve Lash Clearances. 

**Below is a great video that will guide you through setting the Valve Lash Clearances**

*Compatible part