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Dolmar 510 not responding

Discussion in 'Chainsaws' started by isaaccarlson, Nov 10, 2018 at 1:19 AM.

  1. isaaccarlson

    isaaccarlson Well-Known OPE Member

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    I am working on a Dolmar 510 that wouldn’t run anymore. It was so packed with crud from 10+ years that the clutch and flywheel were barely able to turn. I stripped it down, cleaned it, ported it a bit, gave it a new bar and chain, did a muffler mod, and it fires right up, idles great, revs up, but doesn’t seem to cut much better than stock. It is running a 3/8 chain, since that is what the owner wanted and he has spares for it.

    Compression is almost 200 psi, and it pulls over like a tank. New clutch and rim.
    Ignition timing looks to be around 25-30*, but I have to put a light on it tomorrow. Any ideas? I have has excellent results from every saw I have worked on so this is driving me nuts.
     
  2. Dub11

    Dub11 Some body poisoned the watering hole!

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    Maybe the coil is week from over heating after all them years of being overly insulated.
     
  3. Fruecrue

    Fruecrue I got wood

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    Timing numbers?
     
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  4. isaaccarlson

    isaaccarlson Well-Known OPE Member

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  5. Fruecrue

    Fruecrue I got wood

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    Is that before or after porting?
     
  6. isaaccarlson

    isaaccarlson Well-Known OPE Member

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    Both. I didn’t change the timing, just opened up the intake and exhaust.
     
  7. Redfin

    Redfin Meh...

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  8. Termitebuffet

    Termitebuffet Home of the corn can muffler .....

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    They fairly hot anyhow, might not be a huge difference just opening up...

    Sawhawgz, ruining the internet since 2012...
     
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  9. isaaccarlson

    isaaccarlson Well-Known OPE Member

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    Yep, tuned well. It cuts better, but not night and day different like I’m used to. I’ll try running a couple of tanks through it and see what it does. The owner said he couldn’t keep it running before he brought it, so it will be a big improvement for him.
     
  10. Simondo

    Simondo Pinnacle OPE Member

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    The ps-5105 saws i have and work on for others dont really feel so good on 3/8 (full size) so I think the 3/8 chain is not helping in the first place.
    The ps-510 gives back about 1/2 a hp over the Ps-5105 (is it open or closed port by the way as iv never looked inside a 510 ?) in standard condition by my information ...thats a lot to make up just to get to the performance of a stock Ps-5105 and if the 3/8 already dulls the performance on a stock Ps-5105......well you get the picture im painting .
     
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  11. Ronaldo

    Ronaldo Pinnacle OPE Member

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    Interesting reading.....Iv'e tested my 5105 with both .325 and 3/8 and found the 3/8 cuts faster and it pulls a 16 inch bar very well on the full size chisel chain. Has to be the smoothest chainsaw that I've ever had hands on and lots of torque for a 50cc. I only wish the air filtration was a better system similar to my Jonsered/Husqvarna saws. The 5105 is my first saw with heated grips and is that ever nice!

    Sent from my SM-S320VL using Tapatalk
     
  12. Simondo

    Simondo Pinnacle OPE Member

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    The slightly higher gearing of 3/8 I find can pull the rpm down sooner in the average situation /wood sorts unless the operator has a sympathetic hand and keeps a sharp ! chain.
    Start dogging the saw through the bigger stuff rather than self feeding and the saw is running lower RPM easier than on .325. Its a compromise thing with lots of variables but .325 1.3mm and a 15" light bar is still the set up I suggest . We do run 15" on saws in UK a lot .
     
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  13. merc_man

    merc_man merc_man

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    I second the coil. First thing that popped into my mind. If its a limited coil going south it.may not let it go past certain rpm.

    Sent from my SM-J320W8 using Tapatalk
     
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  14. isaaccarlson

    isaaccarlson Well-Known OPE Member

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    This is an open port cylinder. The thransfers looked like they had plenty of area so I left them alone. I will run the saw again and see how it does. The last piece I was using was super hard and may have pulled the rpm’s down a bit. I will get it on video and see how it looks. I’m used to my ported 350, which turns really really fast. If it’s a bad coil it will get replaced.
    AE3676D3-5DB2-4047-BE85-5B4A14CA5072.jpeg
     
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  15. Simondo

    Simondo Pinnacle OPE Member

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    Thanks for the pic of the cylinder .
    A family favourite open hex port cylinder design Dolmar/makita use as well with the ps 32, 35, 420 (421 ) . Here is a pic of a ps 420 for comparison.

    Photo1268.jpg
     
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