The famous 550xp.

[Eddy_t]

No, the saw is under warranty, so is currently untouched. It has been ran on 50:1 Stihl super or aspen. As I have said, the saw is far too choked from factory, god only knows what it'll be like ported! In fact, having looked at the factory bevelling (or lack of) I'm surprised they actually run! If the ports were as open as the 346OE and the coil wasn't limited, I reckon the 560 would easily do 15-16k rpm, god only knows how restricted the 550 is!

[wyk]

It explains how they get massive gains out of a 562 once ported.

[Eddy_t]

It explains how they get massive gains out of a 562 once ported.

 

 

That's good to know, as I've just started reading that thread! But seriously, from inside, I could block the exhaust with my thumb and the intake with my little finger!

[wyk]

That's good to know, as I've just started reading that thread! But seriously, from inside, I could block the exhaust with my thumb and the intake with my little finger!

 

It's just sad. Many coking issues have little to do with fuel mix, but everything to do with the choked up exhausts.

[Eddy_t]

It's just sad. Many coking issues have little to do with fuel mix, but everything to do with the choked up exhausts.

 

 

Yes, but as they said, they got a heap more power from just a muffler mod, the porting almost halved the time through a log!