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Saw leans out after 2-3 seconds.

Discussion in 'Chainsaws' started by Jimmy in NC, Jan 15, 2018.

  1. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    What am I missing? Fixing to try a new filter. Carb is clean, metering lever set .010" higher than spec. Saw came in lean siezed due to a bad FW side seal. New top end, new seals, new rubber. Cranks, runs, idles.

    Go to test in the wood and it pulls well. Piss rev it tunes to a nice 12,5-13 and then after 2-3 seconds leans out and bounces to 15k plus. In this video I leaned the low side a bit to make sure it was not pooling or puddling fuel and just clearing that out. Other than the slow return to idle, makes no difference on the high side. (I know the low is a touch lean in this video.)

    Tank vent? Fuel pickup? USC the carb even though she is dang clean inside?

     
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  2. Manofstihl661

    Manofstihl661 Pinnacle OPE Member

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    My dealer had a saw with an air leak once that he said he couldn’t figure out for the longest time because it passed pressure/vac testing and they replaced all kinds of stuff. Ended up being a hairline crack in the bottom that only opened up enough to leak when warm. They only found it when an old mechanic told him to fill the cylinder with gas mix and let sit. It seemed out the crack.

    May or may not be it but just food for thought.
     
  3. Stihlbro

    Stihlbro Pinnacle OPE Member

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    There is a fixed jet in the body under the metering diaphragm. It supplies fuel to the main jet and low side circuit. The high side screw fine tunes. Make sure both passages are clear.

    Do you have another carburetor to try?
     
  4. Warped5

    Warped5 Pinnacle OPE Member

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    No cracks in the fuel line?
     
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  5. RI Chevy

    RI Chevy Stihl Runner

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    Just me thinking simple, how bout the fuel filter? Is it new or old?
     
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  6. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    China clone carb...that's my next step. If it at least changes it I know where the issue is.

    Sent from my SM-G955U using Tapatalk
     
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  7. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Both of those coming out tonight also. Think I have some spares as I do a bunch of 066 saws..

    Sent from my SM-G955U using Tapatalk
     
  8. Basher

    Basher Pinnacle OPE Member

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    The 066 and 660 has to have the big filter,part# 0000 350 3504 last time I bought them, got a dozen back before they stopped using Media Cat. I have not found an AM filter that can flow enough fuel without removing the inner filter media.
     
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  9. paragonbuilder

    paragonbuilder ONE OF THE GREATEST!

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    My 394 did that jimmy, just happened to have a new one around, thanks @Moparmyway, and it’s perfect. I never did dive into the carb.... yet
     
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  10. srcarr52

    srcarr52 We can't stop here, th1s is bat country!

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    Did you put in a carb kit. They'll do this if the metering diaphragm is stiff.
     
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  11. Moparmyway

    Moparmyway Its just a saw

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    Thought that one is on the 394 I got ?
     
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  12. paragonbuilder

    paragonbuilder ONE OF THE GREATEST!

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    I don’t remember that Saw ever acting up... but you may be right, that was a hectic day. I could be mixed up. Either way, it did the trick!
     
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  13. Al Smith

    Al Smith Pinnacle OPE Member

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    Look at the video again .When it gets reved up the engine rotates on the suspension system .It might be a torn intake boot caused by a faulty AV mount .They tear on the bottom side where you can't see it unless you remove it .
     
  14. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    I have not. Metering diaphragm is real supple.. can put a kit in though.

    Sent from my SM-G920V using Tapatalk
     
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  15. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Thats all new.... AVs too.

    Sent from my SM-G920V using Tapatalk
     
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  16. drf256

    drf256 Giant Member (and Fartknocker)

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    Happens to me a lot with the 036 I build. They are on the edge of what the carb can supply.

    You are emptying the metering bowl faster than it will fill.

    The pin is stuck, lever set wrong, line not supplying fuel at WFO.

    Always the carb for me.
     
  17. traffic903

    traffic903 Super OPE Member

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    Did you say you did check/replace filter Jimmy? Someone on here recently had a problem with an AM filter not passing enough fuel through.
     
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  18. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    I vowed not to go in the shop last night...but while dewatering the dog I was talking on the phone to a buddy. He said something and I asked "Have you seen my bench lately? ...Neither have I!" I wandered out and spent 10 minutes putting c rap away. I chucked this damn saw on the bench and planned just to knock the B&C off and be done. Well I got a wild hair and said let me look at that fuel pick / filter. I am embarrassed. I had already decided to go through piece by piece as to avoid a shot gun and not know what exactly the issue was. My personality say I want to know what/why/how etc. If the pickup wasn't the issue it'll get another set of new pick up lines. Then we will try another carb. The carb looks new inside and the metering side is set with a Walbro gauge... diaphragm is soft. I had this feeling it was stupid simple... and I hope it was.


    The pick up that came out. Note it looked white until I opened it up.
    [​IMG][​IMG][​IMG]


    Now I never knew these things come apart so while frustrated... I've learned again. More knowledge to tuck away. New filter in and go again today if I have time.

    Sent from my SM-G955U using Tapatalk
     
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  19. RI Chevy

    RI Chevy Stihl Runner

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  20. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Keep playing with them... you'll get some that aren't the carb. Been messing with small equipment for 30 years...I've seen some weird stuff and sometimes it's so simple I over think it. First thing I did on this saw was raise the metering lever a touch even though it was set by a gauge before. No change at all.

    Sent from my SM-G955U using Tapatalk
     
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