Husqvarna 550xp mark2 weird high reving issue?

[biggimmer]

Hi, just wondering if anyone has an idea what might be wrong with my saw.

550XP mark 2   The first time the saw played up was after a full day of use and it seemed to be revving irregularly and too high. So instead of hitting top revs and being happy it sounded like the rev rate was 'irregular' and it wasn't sounding happy at all. So I started it the next day to see and it ran perfectly...revving correctly and sounding perfect. I used it for a couple of days and it didn't miss a beat........then it did it again after starting and running fine for about 5 mins.

Any ideas?

[5thelement]

Crank seal. 

[Stubby]

As above .

[spudulike]

The AT would try to keep the revs down and would succeed unless the air leak became too big for it to do this.

If you get a CST read out from the AT, you will be able to look at what the carb is doing at high revs.

 

[biggimmer]

Radial Seal for Husqvarna 346XP, 353, 545 Chainsaw - OEM No. 597 57 61-01

WWW.LSENGINEERS.CO.UK

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Overview: This radial seal is a genuine Husqvarna component for petrol chainsaws, designed to keep the engine sealed and running reliably. Made from a tough, oil- and fuel-resistant...

Many thanks!

Would this be the correct seal before I order one?

I'm afraid i've no idea what an AT or a CST is!?!

And pardon the dumb question but are they easy enough to fit? I've only done basic maintenance on my saws before.

[spudulike]

No, net easy to fit and very easy to cock it up and at £12.50, easy to lose your money.

Getting the old one out, pierce it with an awl at an acute angle ( protects damaging the cage) and lever it out. 

I clean the area, use plenty of oil, push it in as far as you can and tap it in to place with a suitable deep socket.

I do use the factory guide to ease the seal around the inner race which makes it much easier.

I guess I have done around 25 -35 on 550/560/562 and 346s in my time....so you can gauge the worth of my comments.