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Dolmar 420 3/8” drum question.

Discussion in 'Chainsaws' started by Adamski, Jan 11, 2019.

  1. ajschainsaws

    ajschainsaws Axes never run out of Gas

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    I’ve got some small spline 1/4 sprockets thanks @jacob j. been tempted to try
    One on the 420
     
  2. Adirondackstihl

    Adirondackstihl Vert Da Furk........Bork Bork Bork

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  3. Adamski

    Adamski Plebus Splederns

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    I’ll definitely have one off you
     
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  4. Adamski

    Adamski Plebus Splederns

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    So is this p/n a blank splined clutch drum or a drum with a rim included or a spur drum?

    Can’t figure it out?
     
  5. ajschainsaws

    ajschainsaws Axes never run out of Gas

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    The 420 has the clutch drum mounted opposite way around to the ps-340
    And the photo doesn’t show the spur drive on the ps-340 parts drawing


    C18F8B13-8BC3-4C57-9484-20695CEE204C.jpeg FE1501F5-BDE2-4B87-9C03-3546A0979C57.jpeg
     
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  6. 166

    166 Habada

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    There's some bad info on this thread I wanna clear up.

    OP is looking to convert his late model PS420 or PS-420SC to 3/8 pitch from .325.

    Only factory setup would be a 195-223-312 spur style clutch drum for 3/8 lo profile chain. Older part numbers are 195-223-310 & 195-223-311. All will work.

    The 027-223-101 clutch drum will not fit. This is for the Dolmar 109,110,111,115, Makita DCS430, DCS520, DCS5200i, etc chassis. [​IMG][​IMG]
     
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  7. Adirondackstihl

    Adirondackstihl Vert Da Furk........Bork Bork Bork

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  8. Wilhelm

    Wilhelm Pinnacle OPE Member

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    Are You selling those drums as paper weights?

    Did they all come off from conversions, or is that Your for sale stock? o_O
     
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  9. ajschainsaws

    ajschainsaws Axes never run out of Gas

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    My mistake I was full of bourbon on the later part of page 1 I thought the OP was asking about the clutch drum for a ps-340 as well as the 420
    My bad I need a new set of glasssesssss too
     
  10. Adamski

    Adamski Plebus Splederns

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    Andrew, who ported your 420? Was it wyk?
     
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  11. ajschainsaws

    ajschainsaws Axes never run out of Gas

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    Yes he did and a super job as well I think Wes has got a video of it when he done the job
     
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  12. Adamski

    Adamski Plebus Splederns

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    And what would you compare it to? A 346xp oe? A ms260? Let me knoooowww.
     
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  13. ajschainsaws

    ajschainsaws Axes never run out of Gas

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    Adam I can honestly say I’ve never used either of those saws
    But the 420/421 is one of the best saws in the Modern 40cc class
    Port it and it becomes the best awesome little saw
     
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  14. Adamski

    Adamski Plebus Splederns

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    To be honest I sold a ms241 and I think this is stronger. It may not be lighter but it feels more robust. Cheers as always
     
  15. 00wyk

    00wyk Pinnacle OPE Member

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    Yaay bourbon!
     
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  16. 00wyk

    00wyk Pinnacle OPE Member

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    It ain't no 346, unfortunately. But few saws are. Very few saws that are 8cc's smaller are as well. The piston on a 420 is a full skirt affair usually only reserved for open port transfer type cylinders. These pistons tend to be a bit on the heavy side. I also suspect sometimes the manufacturers make the flywheels heavier to balance the package, thus why folks often say these rigs, like open port 55's and 365's have 'a lot of grunt' or 'torque'. And that saw has loads of it. It had a full kerf 325 16" chain on it when I made the video. I did a typical woods port on Drew's saw - good power, long lasting, not challenging the carb so much it has idle or spit back issues etc, and good grunt. I couldn't improve the squish without doing any machine work as it was between .026 and .027 already with pressures in the 170+ range. Having said that, that is my first attempt at an open port 420. Those things are sorta crazy in that they have 3 rows of transfers. SO you are trying to work with all these transfers, but also trying not to hurt the case volume. So, I approached it conservatively. If Andew wants me to have another go, I will do so free of charge - especially if i ruin it ;)

    WYK

    [​IMG]

    [​IMG]

    It's running a lil rich in this comparo, but I am sure Andrew can make a new vid if he likes now that is should be well broken in. Running a 16 inch bar with full kerf 325 - first cut is sans cat and with the exhaust modded. Second half is ported, same chunk of goopey larch.

     
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