029/290 muff mod - found the sweetspot

[SectorB]

At WOT my RPM's are 12,500. I went to my Home Depot and the tool rental shop put it on the tach. The thing runs sweet and sounds great.

 

[stinkbait]

So was the plug to light in color? I know that it shouldn't be white, but is a light tan fine? I didn't see where that question was answered.

 

[little possum]

The indented part on the front of the muffler, is completely gone on mine. Did it the same way as Dads, and its been run pretty good. No problems yet.

 

[nmurph]

tachs are useful for setting up saws that have rev-limited coils. other than that, saws should be tuned by ear. when you mod a muffler the max rpm where a saw can 4 stroke will change.

 

[Medman]

plug color

The plug that was in the saw was dark. I modded the muffler and now it is a tanish color.

thanks again for all the advice.
Tim

 

[Medman]

Murph,
when you say 4 stroke do you mean the gurggle at wot. Thanks

 

[nmurph]

yeppers.............4 stroke......miss...........checking the plug color is good if you shut it down in the middle of a cut........

 

[Medman]

Thanks murph.

 

[bobd80toy]

i know no one has posted here in a while but i just wanted to say thanks to everyone posting the pics and there in put.

i just picked up a 2006 ms390 for $245 and i didnt even have the saw for an hour and started cuttin into the exhaust! i was fine with the power it had....but hell, you can never have to much.

i first drilld a 3/8 hole in the indented part and a few 3/16 else where but didnt notice much difference but then i cut away some on the cover plate and noticed a big difference as soon as it started! thanks again!

 

[southbound]

Welcome aboard!!!!!!!!!!!!!

This is just the beginning :hmm3grin2orange::hmm3grin2orange::hmm3grin2orange:

 

[nmurph]

i know no one has posted here in a while but i just wanted to say thanks to everyone posting the pics and there in put.

i just picked up a 2006 ms390 for $245 and i didnt even have the saw for an hour and started cuttin into the exhaust! i was fine with the power it had....but hell, you can never have to much.

i first drilld a 3/8 hole in the indented part and a few 3/16 else where but didnt notice much difference but then i cut away some on the cover plate and noticed a big difference as soon as it started! thanks again!

congrats......i hope you adjusted the muffler. if not, you will soon be learning how to rebuild a clam-shell.

 

[bobd80toy]

congrats......i hope you adjusted the muffler. if not, you will soon be learning how to rebuild a clam-shell.

i think you mean carb....

 

[nmurph]

i think you mean carb....

nope........got to adjust the muffler bearing. very few people know that these saws utilize them.

 

[bobd80toy]

wanna show me where the blinker fluid goes to??

 

[ri chevy]

My Stihl 029 Muffler Mod

A couple of photos of my Stihl 029 Muffler Mod. The inside has a few holes also.

 

[blk90s13]

Anyone care to walk me through adjusting a carb ? I am wanting to do the muffler mod to the ms290 I picked up yesterday but want to be able and adjust the carb as well


Muffler bearing adjustment ? that is a joke right ?

 

[ri chevy]

Carb tuning

Saw Carb Tuning

 

[blk90s13]

Saw Carb Tuning

Thanks you, that was quick

 

[cheeves]

I proceeded slowly and in multiple steps taking care to test each phase thoroughly with several tanks of gas, kept in good tune, and loaded up in big wood.

First I just reamed out the two existing slots and opened up around the deflector shield exit a good bit, this did very little for performance and the exhaust note hardly changed.

Next I drilled a 5/16" hole in the indented area of the muffler directly inline with the exhaust port which bypasses the internal baffle, surprisingly the increase in throttle response was obvious, running good, sound still well under my Db tolerance.

Today I took a rat file to the 5/16 hole and made it into a slot. Outstanding throttle response, pulls chain alot faster under load, sounds cool with a good "pop-pop" at idle and a tolerable Db at WOT.

I ran two tanks today with a goofy grin on. It sounds and runs so different I decided to pull the plug to make sure I had the carb dialed in right. There's more tan than what this pic shows but it's still whiter than I've ever seen it.

Threw a new NGK in it and opened the H screw just a sniggle, cleaned her up and took pics

Here you can kinda see the increased size of the exhaust exit

Good-looking 10 year old boat anchor

Did very similar work to my brother's 029 and my 310. Like totally different saws now!! IMHO 2 excellent firewood saws!

 

[blk90s13]

Done in 3 minutes with the Dremel tomorrow morning I will start it up and try to adjust the carb




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