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Author Topic: Dolmar PS-421 mods  (Read 4084 times)

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Dolmar PS-421 mods
« on: July 11, 2014, 10:31:17 am »
Had a 421 on the bench making a few minor adjustments. Thought I would share
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Re: Dolmar PS-421 mods
« Reply #1 on: July 11, 2014, 10:33:01 am »
Most popular mod is removing the cat. Which is pretty simple to do. The muffler is 3 pieces with the cat spot welded into the center piece. Drill the 2 spot welds and the cat comes out.
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Re: Dolmar PS-421 mods
« Reply #2 on: July 11, 2014, 10:34:19 am »
And no more cat
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Re: Dolmar PS-421 mods
« Reply #3 on: July 11, 2014, 10:35:20 am »
After the cat is gone I use the embossed area as my outline for the opening
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Re: Dolmar PS-421 mods
« Reply #4 on: July 11, 2014, 10:36:25 am »
The only real problem we have had with these saws is the fuel line coming off the nipple inside the tank. That issue is solved by adding an O ring to the fuel line for that little bit of extra clamping power.
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Re: Dolmar PS-421 mods
« Reply #5 on: July 11, 2014, 10:38:23 am »
This saw didn't get it but I took a couple pictures just to show what is needed for installing a .325 bar and chain on these saws. A clutch drum and bar from a 5105 plus a 10x16x.2 mm shim is needed. This is probably a worthwhile modification just to have rim sprockets instead of spur. The bar needs slight modification to allow it to oil. We drill 2 holes in the groove down through into the adjuster holes. Black lines show where to drill.
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Re: Dolmar PS-421 mods
« Reply #6 on: July 11, 2014, 10:48:11 am »
More to add to this when time permits.
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Re: Dolmar PS-421 mods
« Reply #7 on: July 11, 2014, 12:01:09 pm »
Great info. Thanks for sharing this.
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Re: Dolmar PS-421 mods
« Reply #8 on: July 11, 2014, 12:40:30 pm »
I will add the dual bucking spike when I have free time to disassemble my saw for pics.
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Re: Dolmar PS-421 mods
« Reply #9 on: July 11, 2014, 12:59:43 pm »
Where you use O-ring on line fix.  I have used very small zip ties with success on other saws.  Never thought of O-ring, was this a OEM update fix?
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