Husqvarna 51 porting numbers/mods.

[Magic_Man]

Getting ready to dive into my first porting adventure. I have an open port Husqvarna 51 with a 45mm bore. From what I have learned here I should widen the exhaust and intake to 65% or as wide as everything allows while squaring up the sides. I have already deleted the base gasket and squish is at .031, compression at 170psi. I'm going to muffler mod abviously and match to the exhaust port.

I took a stab at getting timing numbers and I believe they are ex:105 , trans:125, intake:70 ?

How do these numbers look ? Should I leave them alone ? Saw will be a limb only saw with a 16" .325 bar and chain.

 

[Stihlbro]

I believe you are going to find the cylinder to have a larger exhaust port than intake from the factory. I would match intake size to exhaust.

Compression sounds good to me for a limbimg saw. Do you know which carburetor you have?

 

[Magic_Man]

Yes, the intake is very small on this saw. Not much material on the spigot side to open it up. It has the Walbro carb, but can't remember the exact model.

 

[rattler]

Might try 102* 119* 75*