- Local time
- 5:50 AM
- User ID
- 12406
- Joined
- Apr 27, 2020
- Messages
- 272
- Reaction score
- 659
- Location
- Bartlett TN
Credits:
www.arboristsite.com
www.arboristsite.com
After repairing saws back to stock for 8 years I decided to offer up services to a couple of tree service friends. It became clear that they wanted a bit more out of their saws so I started the porting journey.
First up I had a go at a 346xp. I’ve had a personal one for several years and it always blew me away. I had never run anything with work done.
Got some good info from a lot of threads on here and from various YouTubers. I just didn’t want to bump the old threads
I was hoping everyone could share their experience in a newer thread for those late to the 346 party
I have just finished the build and here is what has been done:
-Machined squish band and base 0.050
-Matched cylinder to crankcase
-Widened exhaust port piston side
-Matched exhaust to gasket, muffler side
-Smoothed entry on lower transfers
-Knife edged lower transfer divider
-plugged decomp hole
Exhaust port vs stock
Final numbers:
0.019 squish
105 exhaust
125 transfer - 20 blow down
78 intake
Other parts:
346xp intake boot
357/359 carb mount
HDA 199 carb
357/359 air filter/elbow
Cylinder cover without primer hole
Modifications:
-Opened up carb base floor to fit 357/359 switches.
-Ground a few mm from crankcase where intake partition sits.
-Gutted fuel vent in tank, but ended up using an echo style vent on the end of the vent hose
-Muffler mod, used a dukes wide deflector
It runs and screams but I haven’t really got to test it yet because of the heat. I made three cookie cuts so far and it feels pretty strong. Hoping to get some video soon and put it up against another stock 346xp for comparison.
I have a few more to work on and would maybe like to decrease the blowdown on the next one.
All feedback/advice/hate is appreciated
Masterminded 346XP Tips And Tricks
Here's a few little things we do on the 346XP..... No closeups of the port work.......we've seen too much of that stuff already. Just remember......no popups were harmed in the porting of these three cylinders. :)
www.arboristsite.com
Mastermind Revisits The 346XP
I've done so many 346XPs that I don't think about doing a thread on them when they come through. I thought I might share my version of the 346XP build. Now keep in mind that everyone has their own ideas about what makes a great running 346XP.......just because I might do something a bit...
www.arboristsite.com
After repairing saws back to stock for 8 years I decided to offer up services to a couple of tree service friends. It became clear that they wanted a bit more out of their saws so I started the porting journey.
First up I had a go at a 346xp. I’ve had a personal one for several years and it always blew me away. I had never run anything with work done.
Got some good info from a lot of threads on here and from various YouTubers. I just didn’t want to bump the old threads
I was hoping everyone could share their experience in a newer thread for those late to the 346 partyI have just finished the build and here is what has been done:
-Machined squish band and base 0.050
-Matched cylinder to crankcase
-Widened exhaust port piston side
-Matched exhaust to gasket, muffler side
-Smoothed entry on lower transfers
-Knife edged lower transfer divider
-plugged decomp hole
Exhaust port vs stock
Final numbers:
0.019 squish
105 exhaust
125 transfer - 20 blow down
78 intake
Other parts:
346xp intake boot
357/359 carb mount
HDA 199 carb
357/359 air filter/elbow
Cylinder cover without primer hole
Modifications:
-Opened up carb base floor to fit 357/359 switches.
-Ground a few mm from crankcase where intake partition sits.
-Gutted fuel vent in tank, but ended up using an echo style vent on the end of the vent hose
-Muffler mod, used a dukes wide deflector
It runs and screams but I haven’t really got to test it yet because of the heat. I made three cookie cuts so far and it feels pretty strong. Hoping to get some video soon and put it up against another stock 346xp for comparison.
I have a few more to work on and would maybe like to decrease the blowdown on the next one.
All feedback/advice/hate is appreciated
Last edited:
