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Cannot find the RPM - 026

Discussion in 'Chainsaws' started by Jimmy in NC, Feb 27, 2019.

  1. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    So I've had a box of 026 kicking around and I'm tired of kicking project boxes around. I decided to put it together and play with the ports a bit just to see what I can do. I've done more stock rebuilds than I care to remember and it's time to see if I can handle a twirly bit too...

    So I built it with as much Asian flavor as I could .. well because it's a budget build for me. Saw went together well and cranked with no fuss. It's wearing a Farmer Tec 44.7 jug and piston with no base gasket. Squish is at 0.026-0.027". Carb has been both an AM carb from Dave and a rebuilt WT-194 carb. Saw cranks cold and warm, idles all day. Comes off idle like other 026's I've had (stock saws)... not my ported 346.. but not a stock 088 either.

    The problem is I cannot get it to go over 13,000 rpm.. I did see 13,200 once.

    The jug I cleaned up the casting flash, modded the muffler (mild), and barely widened the exhaust. None of the ports were changed other than some beveling. Same Farmer Tec shape and size.

    I shaved 0.012" off the key to advance the timing.

    Saw is blowing 190 psi according to my Echo gauge.

    My question is this: Can the jug timing be off so bad that it will not go over 13,000?

    I plan on trying to run it with the air filter removed this afternoon to see if that makes a difference. I do not think the shutter is being sucked closed, but I want to remove that as a possibility. Next step is to pull the timing advance out of it. I doubt it's over advanced as it cranks well and idles well but I can remove it to eliminate a possibility.

    The only other thing I know of to do is clean up the OEM jug and buy a 44mm piston for it.

    Any of you experienced porters have any ideas or thoughts? I think that if it was lean for fuel it would go to the moon. I can add fuel and take fuel away and it simply will not go over 13k. I can only come up with the thought that it just cannot move enough through efficiently to turn any higher.
    [​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]
     
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  2. redline4

    redline4 I'm huge in Japan

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    It's cuz you aint gots no farkin chain on it!

    Did the flywheel slip? Just throwing that out there.
     
  3. Backtroller

    Backtroller Pinnacle OPE Member

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    I had a flywheel key shear and I experienced that. Chased my tail for a while.
     
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  4. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    I will check tonight but I seriously doubt it.
     
  5. huskihl

    huskihl Sausage Fingers Forever

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    Doesn't look like there's a whole lot of proper direction in the transfers. Instead of flowing toward the intake, maybe they're shooting straight up to the middle of the piston and mixing with the spent remaining charge. Idk. Just a thought
     
  6. huskihl

    huskihl Sausage Fingers Forever

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    AM coil too? Could try taking another .020 off the key.
     
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  7. Wonkydonkey

    Wonkydonkey Pinnacle OPE Member

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    Nice thread, :) And pics. And I’m a fan of Am parts, cos they are affordable

    I’ve just played with a snail of a saw that bogged like crap. I gave it some boost ports and enlarged the trans as well as raised the bit I enlarged. (Am p&c) it also has 20thou off the key

    However. I also gave the exhaust an extra hole to breathe more.. now this saw has more torque... it pulls like i thought it should have..

    I as I’ve played with more than one thing I can’t say what did the trick... but the exhaust could be the prob

    Edit as huskihl says try another coil ? My coil is oem
     
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  8. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    OEM.[​IMG]
     
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  9. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Should breathe enough for stock RPMs. [​IMG][​IMG][​IMG]
     
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  10. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    I am going to check a few things here as I said in the OP. If all else fails I can pull a coil off my 036 and try it. I really think it will be air filter or the cylinder itself.
     
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  11. dall

    dall Soon to be banned fart knocker.

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    muffler a little wet like it isnt burning all the mix ?
    im with kevin on this one about the coil breaking down
     
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  12. cus_deluxe

    cus_deluxe ONE OF THE WORST!!

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    Do you have a degree wheel? I would be curious to see where things are at least.
     
  13. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Coil is coming up. Muffler and plug so far have good color. No time to run it tonight but tomorrow I will make time.
     
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  14. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    No I do not... but I have been looking at them.
     
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  15. 5000+

    5000+ Super OPE Member

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    Yes the port timing can be an issue. What happened with the air filter
    Off?
     
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  16. 5000+

    5000+ Super OPE Member

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    Really need to degree it to get some numbers.
     
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  17. jasper89

    jasper89 Well-Known OPE Member

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    Master switch not releasing the choke?
     
  18. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Long day at work, home later than I wanted and my two little kids are in bed by 7:00. No time to make noise tonight. May get a few mins in the AM.
     
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  19. Jimmy in NC

    Jimmy in NC Pinnacle OPE Member

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    Choke is coming off. I've been reading lots and apparently it can be sucked in at WOT. I've had several 026s and a 260. The choke setup always pisses me off.


    I also want to systematically go through step by step and find what the issue is. I do NOT want to change 5 things and try...I do have a Meteor piston in route from HL to go in my OEM jug if we get that far with out finding a solution.
     
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  20. drf256

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

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    Can we see the air filter?
     
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