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My 3120xp mods, share yours and or your opinions

Discussion in 'Chainsaws' started by kneedeepinsaws, Aug 2, 2020.

  1. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    Bought this saw to replace my 395 for milling, out of the box I was a little disappointed to be frank.
    I did a couple things to make it a little more fun to use and more reliable for milling.


    air filter
    Not the best setup cause it was passing particulates, I didnt want any dirt in the engine if I could help it. So i took the flock filter and ran a thin layer of RTV black on the sealing edge of both sides. I worked it in and ran it smooth with my finger. Let dry and used grease to make a good seal. This shot of the intake horn is after two tanks today, extremely clean air going in now
    Theres some gunk near the top cause some sawdust fell in when i took the top off. If you look down into the horn it is clean F84365A8-3FB4-46F8-B726-82ACD318FFAB.jpeg 28C8F289-C8AE-4649-995E-6B5D50792222.jpeg
    next was the coil, got an unlimited china one off of ebay, I believe it was a 272 coil. If i could find an OEM one I will probably swap it out. But it is working fine. Combine this with the carb mod from mastermind and you can now tune the saw properly. I set mine at about 10.4K or so, seems to run well with the muffler mod you will see here shortly.
    C0B6129D-083B-48CB-8DA2-819AAC1DDB84.jpeg
    next is the adjustable carb. Mastermind sold me this and he did a very nice job. The air horn must be modified in order to accept the adjustable high jet screw, uses an allen key instead of a slotted screw driver. This is a lousy shot but you can see the high jet and some of air horn removed to accept it. When you buy this you get a brand new walbro carb to replace your stock one. Thanks mastermind this is the bread and butter of this saw IMO
    C1490F8F-62C6-4ABE-BA47-D8E881EAAB59.jpeg
     
  2. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    Next is a basic muffler mod, this saw had a very small baffle for exhaust gasses to escape, i just opened it up to full size with a dremel exposing the internal pipe.
    EC93EE92-655F-4424-8697-533247ACA383.jpeg

    next is a sticker for your country of residence. Instant 30% horse power and throttle response
    FC618C08-130F-4EF5-89DE-19672FF2E700.jpeg

    stihl elasto start. I bought this to help with the snap back from the flywheel tugging on the starter cord when the engine dies. It did not work for that at all, and ill have to mod the clutch cover and ring the cord slides into to do it properly. I did however find that the saw was much easier to start!
    837B5DC4-D6A0-432C-B9A2-02231204B5EE.jpeg


    Finally the clutch cover. I found an area near the chip deflector cut out that seemed to be just blocking chip flow. I think the lug that was there was meant for structural support in case the saw were to fall on this area. I ground it off to give a full path for chips to fly out. You can see the metal ground off near the inside of the deflector, unfortunately i do not have a before shot.
    2E416F08-CD7A-42A7-B309-521403BE9D8D.jpeg
     
  3. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals) GoldMember

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    I have limited experience, but some with my 3120.

    Did your saw have a green factory coil? If it did, you’re good to go with the 272 coil. If you had a factory black coil, the timing will be way off. 2 different flywheels over the years.

    Im using the factory foam air filter and cage on mine.

    After some break in, I set my Masterminded carb to around 12500 and the saw came alive. I initially added a flywheel side deflector to mine which worked out well, as it would direct exhaust away from me while milling, but it did get my hand kinda hot.

    Now my saw is a @Moparmyway beast. Kevin did his magic inside and added a big ole pipe out the fly side of the muffler to direct heat and gasses away from me. I haven’t wanted to try it yet, as the 90* weather and milling kinda don’t jive. But from Kiev’s test vids, it’s a beast.
     
  4. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    Yes i found out yesterday milling that this heat is too much for the saw. She vapor locked after 5 passes, so i shut her down. I realized its gonna take at least an hour for her to cool down so i packed up... too bad.

    yes mine had the green coil back and if you look in the pics i added a 272 coil. I would like to see the foam filter setup you have
     
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  5. Billy Currie

    Billy Currie Pinnacle OPE Member

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    Yikes! I thought the 3120 would have worked better for milling than that. Sorry to hear it didn't work well.
     
  6. Lightning Performance

    Lightning Performance Here For The Long Haul!

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    Maybe you should play with the ignition timing.
    Ran off tank after tank in this weather with a 660 and the 084's

    I do keep melting the buttons off of decomps on the 660 but no other issues. Not my norm but I'll take it. Zero other issues after swallowing a decomp a few weeks ago. They just need better buttons. Threading the next one for nuts. Melted a TS400 decomp last time
     
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  7. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    Do you think retarding it just a degree or two would help cool it down?
     
  8. rogue60

    rogue60 Here For The Long Haul!

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    Vaper locking that's odd sounds like its the fuel to me.
    I've run a 3120 in 40c 100f heat all day many tims never had it vaper lock but that was a few years ago when pump fuel was good and not the rubbish they sell now days that boils at a much lower temperature made only for high pressure heat shielded constant circulating fuel systems in modern car's.
     
    Last edited: Aug 4, 2020
  9. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    I might have tuned it too lean... hmmm maybe i should do a vac test on it...
     
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  10. Nutball

    Nutball Pinnacle OPE Member GoldMember

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    The OEM Stihl valves have wings stamped into the shaft so I thought, so they can't fall into the cylinder.
     
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  11. Stump Shot

    Stump Shot Disciple of Monkey's GoldMember

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    There's only a tiny hole on the inside of the cylinder.
     
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  12. Nutball

    Nutball Pinnacle OPE Member GoldMember

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    Which is why Husqvarna is lotz better, but you will see I was replying to a Stihl post.
     
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  13. Lightning Performance

    Lightning Performance Here For The Long Haul!

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    Good point. Try avation fuel to cool it down. Better fuel and all gas.
     
  14. Lightning Performance

    Lightning Performance Here For The Long Haul!

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    Not all of them were pinched enough. I did one on an 066 that ate a decomp. Both were oem.
    I drilled out that stock 660 that fell in with three 1/64 holes. It's getting threads and a nut. lock the nut, peen the end and a dab JB should do.
    The AM decomps are gone in five minutes. The button oozes over and the tension is long gone on the fingers in one tank. Not on my saws thank you. Hobby time is over. Quality chit ftw.
    What type an octane fuel you burning?
    Go there first.
     
  15. Stump Shot

    Stump Shot Disciple of Monkey's GoldMember

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    Sorry I was cornfused.
     
  16. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    I run shell 92 octane no ethanol with maxima k2 at 40:1

    i tuned it to 10.6 but i didnt tune it after the first cut which is the most important cause thats when its warmed right up.
    I wont say that it vapor locked completely but i could tell it was starting, it was leaning out real bad after the 5th pass with high rpm. I tried dumping more fuel in the high jet but it only worked for a moment then went lean again. Brought it home and fired it up and retuned the high back to approx where it was and it was running fine
     
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  17. huskyboy

    huskyboy Sorta a husqvarna guy...

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    Leaning out on the H midcut? Sounds like it could be a airleak or a carb issue...? Idk how a 3120 is setup but if it’s like a 394.... it’s very easy to bugger those carb/intake manifold gaskets upon installation if your not careful. Also the intake blocks can crack. I’ve had vapor locking happen to me on other saws. When that happened to me the saw just refused to start and I proceeded to get pissed off lol. Leaning out on the H scares me... if that is what is really happening to you though. Could be something to look into.
     
    Last edited: Aug 5, 2020
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  18. Deets066

    Deets066 AKA Deetsey

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    Pics of a melted button
     
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  19. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    The reason i wasnt too concerned is cause other people have reported vapor lock with this saw.

    I will look into it though, you got me thinking now...
     
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  20. kneedeepinsaws

    kneedeepinsaws Pinnacle OPE Member GoldMember

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    Lmao haha
     
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