MS170 muffler exhaust mod to expel exhaust more effectively

[@adelarsen9776]

I've done the side adjust and fang on my 2 170's. I have not done the exhaust yet and may never. Good video though especially the bit about making the exhaust port holes too big. :-)

[@blueyhanson6253]

G'day, and many thanks for all your 'How to' videos. They do help when there is so much rubbish being put out there. Regarding the muffler holes: call me dumb but did you enlarge them all? My local Bunnings didn't know what sieve mesh was. Oh dear!! The side adjuster and dogs do make a difference to a handy sized MS170.

[@ChainsawUsers]

I just bent them outwards a bit gave it a tad more space

[@blueyhanson6253]

How many of the 3mm holes got enlarged to 4mm?

[@ChainsawUsers]

@blueyhanson6253 all of them

[@blueyhanson6253]

I'm told that mesh size 20 is 1mm holes and depends on where you buy it its available in a sample size for under $6. Larger size e.g. 300mmx300mm around $22 Australian - free shipping on most.

[@ChainsawUsers]

It most likely breaks regulations am sure. Anything you touch on any exhaust will break manufacturers and government regs. But that said it runs better

[@barktwicemofo]

great info and video , the dog spikes ?? , stihl, or ?? , another great poster is donyboy 73 , he says and shows the part # s 4 the saw ... thanks!!

[@ChainsawUsers]

Yes Stihl dog spikes

[@Abc-kn5wj]

Did you keep the stock carburetor when you did that exhaust mod or did you ring out the main jet or you keep everything bone stock

[@ChainsawUsers]

All I did was change to bigger mesh so the saw will breathe a litter better and retune low and high. It runs slightly better not a huge Increase but better small Increase than no increase

[@johnchuck9573]

I had to drill my screen.I will look for the bigger screen the next time I'm at the hardware store.

[@ChainsawUsers]

Yes drilling can work also pulling out every 2nd or 3 rd wire also works

[@johnchuck9573]

@@ChainsawUsersI've found since switching to a cleaner oil I don't have to clean it as often.Thanks for this channel.

[@johnchuck9573]

My buddy told me to use size 20 stainless steel mesh.

[@ChainsawUsers]

@johnchuck9573 a few sizes up will do the trick 20 stands per inch sounds about right

[@lion19557]

What is the size of t spinner you used for muffler nut

[@ChainsawUsers]

Muffler nut is standard fitting

[@ChainsawUsers]

6mm

[@lion19557]

@@ChainsawUsers thank you so much dude 👍

[@Aisajoni]

I had 8mm and no net at all.

[@ethaneth85]

Did you adjust the carb afterwards?

[@ChainsawUsers]

No because it just breaths a little more. Many people go to far with these mods and yes they require tune up

[@phantomshtter]

I drilled the dead center hole and far left, far right middle holes to meet their corresponding holes, kept the stock screen and flared the vents slightly. I knew that goon that carves out the entire grid ruined his saw.😅 It's amazing how ignorant people are to air/ fuel ratios. Anytime you open intake or exhaust on an engine, you're leaning it out. Lean is mean... until it's burnt up the motor.

[@ChainsawUsers]

That said means bark box egan straight shot will all lean out the motor. I only flared the vents also just a bit