Brand new ms661 bog (Mtronic 3.0)

[LordFarkwad]

Yes a retune might be in order on a standard carb.

Mtronic will take care of itself?

 

[Barc Buster]

Mtronic will take care of itself?

Yes it should sort itself out. Could always do the reset if your feeling frisky:

 

[Jonny]

Is it still under warranty?
Just to be clear, it runs great after warmed up, but warm up takes a long time?

 

[LordFarkwad]

Is it still under warranty?
Just to be clear, it runs great after warmed up, but warm up takes a long time?

100% still under warranty. However, calibrating Mtronic seemed to clear things up. I put a tank through it and it is 100%. Could have been confounding factors that contributed: old-ish fuel and not letting it warm up for a couple of minutes.

 

[New2trees]

Yes it should sort itself out. Could always do the reset if your feeling frisky:

I like the second sequence on the newest models....seems a lot more likely to calibrate correctly and also the RPM changes allows you to be certain that the function is indeed working.

 

[Barc Buster]

I like the second sequence on the newest models....seems a lot more likely to calibrate correctly and also the RPM changes allows you to be certain that the function is indeed working.

Me too. It's important to remember that each sequence is version specific though.

 

[New2trees]

Me too. It's important to remember that each sequence is version specific though.

Yeah for sure.... You just know somewhere out in tree land a guy has had an early version wide open for 5 minutes waiting for the RPMs to change........ ;-)

 

[LordFarkwad]

An update...

This thing became a different saw after about 10 tanks. Holy crap. I can lean on it now. Still takes a while to warm up, but once it does...dag. it's scary

 

[islandarb]

My 661. Is a wood eater. Love the damn saw.

 

[LordFarkwad]

My 661. Is a wood eater. Love the damn saw.

No kidding. I have a 362 that was broken in, and it vs the brand new 661, considering weight penalty, left me saying "meh". But the post break-in difference was dramatic.

 

[LordFarkwad]

Got a 25" Stihl bar on it at the moment.

 

[Barc Buster]

An update...

This thing became a different saw after about 10 tanks. Holy crap. I can lean on it now. Still takes a while to warm up, but once it does...dag. it's scary

You think the regular 661 is a beast, try a 661 stroker! Ran my buddy's and wow! 100cc of kick ass!

 

[LordFarkwad]

You think the regular 661 is a beast, try a 661 stroker! Ran my buddy's and wow! 100cc of kick ass!

Stroker?

 

[Barc Buster]

Stroker?

661 with a 660 crank massaged into it:

661 Stroker

Ive had this idea rackin around my noodle since the first 661 I built. Mr Cole won a prize pick from me in one of the raffles and we got to chatting about what to build. Cole has an almost new 661 and what better time and fella to build a stroker for. Used a new 40mm 660 crank for this...

opeforum.com

 

[chiselbit]

Beware @LordFarkwad, once you set foot down the shadowed path of modified saws there’s no turning back. Soon stock saws will no longer be of interest to you. Only superfast expensive hot saws will do. Disposable income will be a thing of the past.

 

[Barc Buster]

Beware @LordFarkwad, once you set foot down the shadowed path of modified saws there’s no turning back. Soon stock saws will no longer be of interest to you. Only superfast expensive hot saws will do. Disposable income will be a thing of the past.

Lol ported saws are a fad

 

[southsoundtree]

Plugs and muffs, plugs and muffs.

 

[chep]

I was having carb issues with my 661 seemed like the air filter was not making a good deal to the houseing.
Solution: take some grease and goop up around the air filter where it seats against carb body. Apply liberally. It will help create a deal against dust & shit getting through the gap. No more carb problems since. I am doing g it on all my stihls now and have been really pleased. The carbs are so sensitive it's worth a try

 

[Birdyman88]

And also, do y'all mix a few gallons at a time, or what?

I have 5 gal and a 2.5 gal all mixed 50:1 with Stabil fuel stabilizer. Someone mentioned using the puregas.org site. Do it. Find a dealer that sells 93 non-E, mix it with the Stihl ultra synthetic oil and dont look back.

As far as the saw bogging, almost every saw I own does that right off a cold crank, including my mtronics - 241 v2, 362 v3, 661 v2. The best saw is a 271 which takes almost no time to start ripping. It also my oldest saw.