Picture # 1 shows the spot welds that you have to drill ....2 of them lite tap and this plate is removed .....Brad this is the Cat not the plate its welded to...This piece in the picture gets removed from the screen plate that gets reinstalled...
Dolmar PS420 after some use
- Thread starter cuttinscott
- Start date
Help Support Arborist Forum:
Picture # 1 shows the spot welds that you have to drill ....2 of them lite tap and this plate is removed .....Brad this is the Cat not the plate its welded to...This piece in the picture gets removed from the screen plate that gets reinstalled...
Euro mufflers ....
.
Cat break down ...
.
Last edited:
This is just to show how the cat is installed in the muffler on the 420......
It is not telling you thats what you should do to remove it !!!!!!!
Its just informational is all.....
.
Last edited:
Think we could make of these to run well enough to wear it's girth
Think we could make of these to run well enough to wear it's girth
Mine in stock form does good ........There are always gains to be had
..
Last edited:
If it's anything like the 3800 it'll be a screamer then. It went from an absolute dog of all dogs to a permanent resident here! That is until something better comes along to knock it off it's throne.
SawTroll
Information Collector
K9-Handler
ArboristSite Operative
Next step
I just wanted to expand on 04Ultra's muffler pics above. He had mentioned before about drilling out the two welds, but couldn't quite picture it until he posted the photos -- then it all made sense!
So I used a die grinder to cut through the welds and removed the cat to put on the shelf so I could give it to the new owner if I ever decide to sell my new 420.
In the photos below you can see the holes where the welds used to be. No point in filling them, as the screen plate fits right up against the outside cover.
Now that the cat was gone I could concentrate on making the muffler flow even better. The fish-gill slots right under the screen were now the target, so I removed them, then opened both sides of the screen holder. I also removed the deflector from the screen shell that just duplicated the one on the outer shell (see 04Ultra's last photo above).
This next shot is with the outer cover re-installed over the screen shell on the saw. I apologize for the quality of the photo. You can look in the opening past the screen into the inside of the muffler. Lots bigger and less restrictive.
I'd love to see how this differs in actual operation, but I left my tach home today.
I'll get back with a report later.
Have fun!
K9-Handler
I just wanted to expand on 04Ultra's muffler pics above. He had mentioned before about drilling out the two welds, but couldn't quite picture it until he posted the photos -- then it all made sense!
So I used a die grinder to cut through the welds and removed the cat to put on the shelf so I could give it to the new owner if I ever decide to sell my new 420.
In the photos below you can see the holes where the welds used to be. No point in filling them, as the screen plate fits right up against the outside cover.
Now that the cat was gone I could concentrate on making the muffler flow even better. The fish-gill slots right under the screen were now the target, so I removed them, then opened both sides of the screen holder. I also removed the deflector from the screen shell that just duplicated the one on the outer shell (see 04Ultra's last photo above).
This next shot is with the outer cover re-installed over the screen shell on the saw. I apologize for the quality of the photo. You can look in the opening past the screen into the inside of the muffler. Lots bigger and less restrictive.
I'd love to see how this differs in actual operation, but I left my tach home today.
I'll get back with a report later.Have fun!
K9-Handler
Last edited:
Thanks K-9. ......I was going to post cut out gill's and was a bit busy ....Mine really runs good ....
......I was going to post cut out gill's and was a bit busy ....Mine really runs good ....
I can now tell you why you guys like your PS420s so well and say they're so strong. I've got one setting here with about 5 minutes run time on it and the compression is already.......................................................................................................195 PSI!!!!!!!!!!!!!! Yes you read that right. This will be a 200 PSI saw when it's broken it. No wonder they're so strong.
Javelin
Addicted to ArboristSite
They are just good saws! I use a 350 as a demo and people are amazed at it! That little 350 sells 420's for me!
So has anyone else checked the compression on this new line of saws?
Javelin
Addicted to ArboristSite
I will add that to my to do list:greenchainsaw:
I knew when I pulled this thing out that it had strong compression. I was still surprised when I saw how high it really was.
windthrown
361 Junkie
I wonder what the compression ratio is on the 420 then. Seems really high for a chainsaw. Might need AvGas to run it right.
I can do that if need be. I'll have the cylinder off soon enough and will have a good look at the piston.
166
Addicted to ArboristSite
What do the redmax 3800 & stihl 180 have for compression stock?
Nothing - except that the specs of the 420 places it in no-man land, but a close to pro-quality "homeowner" saw - the old 242xp has .6 more hp for the same cc and weight + 2k more max rpm.
I hate to say this but there must be a big difference between guys like me that actually work with their saws and people who sit around and compare weights and horsepower and rpm capabilities of their saw. I guess I'm a little old school in that I feel that quality isn't necessarily lighter in weight. You'd have a hard time convincing anyone NOT to get a particular saw because of its weight. Its not like we are comparing the weight of a 420 to a 066 or something. Especially when it is obviously a high quality saw and for a lower price tag!!! Good luck with that argument. Robb
