K770 Recoil Starter A Weak Pull a Dead Spring

The K770 recoil starter fails two ways, and they are not the same failure.

The recoil starter is the complete unit on top of a concrete saw: the orange shroud, the spool, the blue rope and the T handle. One pull turns the rope around the spool, the rotor picks up the flywheel teeth, and the engine cranks. On a machine this size, starting is a whole assembly, never a loose rope.

What a pull that will not take means. The spring inside has gone tired. The spring is what takes the force of your hand and spins the flywheel fast enough to fire. When it has set, the pull goes soft, half your pulls do not turn the engine over.

What a rope that does not come back means. You let go and the rope stays out, or it pays right the way out. That is the spring or the rotor, the spool no longer reels the rope in, and the next pull sends it all out and the machine stops on the spot.

Why replace the unit instead of the rope? The rope is wound on the spool, and the spring and the pawl sit inside it. Changing the rope means stripping the spool apart, and putting it back together is no cheaper than fitting a new unit. That is why this part is sold as one assembly.

Does it fit the K750, K760 or K760 II? They are machines on the same platform, and the starter is interchangeable, it suits the K770, K750, K760 and K760 II. Before you order, compare the number on your old part, 584886804 is the one that matches, and if yours carries another, check the mounting holes and the shape of the shroud.

When is it time to swap? A frayed rope, a spool that idles with a rattle, a pull that has gone soft, a rope that will not reel back, a shroud that has cracked and works loose. Any one of them. Do not wait until the machine is down in the middle of a job, the money a set of downtime saves is worth more than a starter.