Cylinder cleaning on 550xp/560xp

[Mark_Skyland]

I don't seem to have much success in salvaging cylinders on the 550xp or 560xp saws. Is it just me, the owners running the saw to death or are the new husky cylinders bores not as tough as the old ones/mahle cylinders?

 

Either the chrome ends up pitted or there are too many scores in the wrong place.

[adw]

I have cleaned a few 550/560 cylinders, the Nikasil plating is done to a high standard within the Husqvarna factory, i guess there will always be some cylinders too badly scored to recover, small pits in the bore are not a problem as they will help oil retention, wet and dry then use a flex hone, its amazing how many you can recover, to give you some idea of how good the plating is i have just plugged a 560XP in with its original cylinder with 900 hours on the clock.

[MattyF]

Spud saved my 560 cylinder mark .... And it was bad apparently!

[spudulike]

Spud saved my 560 cylinder mark .... And it was bad apparently!

 

When stuffers break up.....it is bad!!! Close to dead!

[Mark_Skyland]

I will have another check of them tomorrow but some bad scoring above the exhaust port and the acid just doesnt seem to work as well as it does on the stihl cylinders. I have 2 550xp cylinders that have gone down while using aspen, one 560xp due to a crank bearing and a 560xp due to no 2 stroke. Stihl 441 and 260 due to bad fuel came up lovely with not much effort.

 

I was just thinking the autotune had kept the saws running better than a standard carb would hence more/severe damage.

[spudulike]

I usually find the smaller harder revving saws are more difficult to save. The 346 tends to take the top end out and score but slower saws ....MS660 etc are usually fine.