Stihl 661c

[Wolfnw]

So I bought this 661C from a buddy got it all cleaned up, dyed the plastics did a little muffler mod. I’m curious if these port well and if so if anyone could share some # and maybe pics of port shapes? Also curious what this saw is worth as is?

 

[thinair]

I have a ported 661, its defiantly my favorite 90cc saw

 

[Dolkitafreak]

A ported 661 can make pretty insane power!

 

[Wood Doctor]

Around here, a used 661c Stihl chain saw sells for about $800 if it still runs well. A non-runner goes for about $350 if it looks to be in good cosmetic shape.

 

[Redfin]

661s turn up very well.

 

[BlackCoffin]

661 ported is one of my favorite saws to run. I own 2 and want more!

 

[Kw trees]

I got mine ported and definitely worth every penny ported

 

[smokey7]

Around here that saw is around 700 minus the cost of new top and air filter covers to replace the dyed ones. Nobody round here wants modded stuff like that especially stihl stuff.

 

[MemphisMechanic]

Delete the base gasket and verify you have plenty of squish. Open up the lower transfers, leave the uppers and the intake alone. (The intake timing is already at the maximum limit of what I’d want on this saw.)

Take three degrees off the roof of the exhaust to bring the powerband up, and add a bit of blowdown.

Here’s one built like this:

View this content on Instagram

View this content on Instagram

Scroll to the right through this post and it’ll show you my approach to a really ripping ‘woods port’ with nothing more than a dremel required:

View this content on Instagram

View this content on Instagram

The saw also has .020” off the flywheel key, and a triple-ported muffler.

Could it make even more power if the band was cut and the base machined? Sure. Of course. This is not a pro level build. But it’s hardly trivial increase in power, if you have patience and a dremel.

 

[Redfin]

Have you tried more intake duration?

 

[Dolkitafreak]

Have you tried more intake duration?

I have…me likes

 

[huskihl]

Delete the base gasket and verify you have plenty of squish. Open up the lower transfers, leave the uppers and the intake alone. (The intake timing is already at the maximum limit of what I’d want on this saw.)

Take three degrees off the roof of the exhaust to bring the powerband up, and add a bit of blowdown.

Here’s one built like this:

View this content on Instagram

View this content on Instagram

Scroll to the right through this post and it’ll show you my approach to a really ripping ‘woods port’ with nothing more than a dremel required:

View this content on Instagram

View this content on Instagram

The saw also has .020” off the flywheel key, and a triple-ported muffler.

Could it make even more power if the band was cut and the base machined? Sure. Of course. This is not a pro level build. But it’s hardly trivial increase in power, if you have patience and a dremel.

All those 661 logs and you video a punky 18” white elm with a 36” bar that most would cut with a 346. Stick that that thing into a log if you’re gonna talk about it like that

 

[Maintenance Chief]

All those 661 logs and you video a punky 18” white elm with a 36” bar that most would cut with a 346. Stick that that thing into a log if you’re gonna talk about it like that

Aahh yeah my 034 is faster than that?

 

[MemphisMechanic]

I have…me likes

Where are we talking about going? This first build I stuck to pretty conservative numbers. I’m highly, HIGHLY open to suggestions.

I’ll post a video of the above saw cutting a 4+ ft oak on a crane job soon. Crew estimates it’s a full 30-60 seconds faster on a large stem pick.

That said, I’m sure a 661 can be built much quicker than this one. It’s a conservetive port job for someone whose crew runs their saws with… very little maintenance.