The fork oil hadn’t been changed for at least 30,000km, which is probably too long, but I never seemed to get around to it. The Guzzi forks are similar to that of my Metal Stone and are easy to remove to replace the oil, so there’s no real excuse.
I drop the forks part of the way, then tighten the lower triple clamp, which acts as a vice so I can crack open the top fork cap. Then drop them all the way out.
Take off the fork cap, remove the spring and spacer tube and drain. The old oil which drained out looked like old dish washing water. After a rinse with kerosene, I let the staunchions drain while cleaning up the legs and parts of the front of the bike which I can’t normally reach.
Four hundred ml of lovely red Motorex 10w fork oil then went into each leg. Reinsert with the aid of a screwdriver to slightly lever open the triple clamps.
Taking the front end apart.
Dirty old fork oil.
Draining the forks after a rinse with kerosene.
Motoguzzimackers' Moto Guzzi Diaries 