Echo CS-670 Porting At Home?

[Fordiesel69]

Real quick, I always liked my 670 and thought the power was decent enough. However once I stated operating a 390XP, a 555 auto tune, and now a little 545 Mark II, this saw is utterly gutless even when tuned. Watching videos of the 680 and 670 on youtube shows about the same performance as mine. The ported saws sound and look like they are really woken up.

Being I have never ported, and do not understand all the timing numbers, could I follow Tinmans videos and grind like his and just be conservative? Or would this make it worse?

It looks like most of the gain are increasing the transfer port size, and widening the exhaust port.

 

[Bjorn T]

Hello. The easyest way is to send the saw to a professional porter, like Huskil or other one. Someone thats now What he is doing. Tinman is the Canadian ironhorse.
There are many porters that do mutch bettet work than Tinman.
To port a cylinder needs alot of tools , grinders, lathe and the most important knowledge, visdom and common sence.