Welcome to the Arbtalk.co.uk | Discussion Forum for Arborists.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Chainsaws Discuss chainsaw makes and models, pros and cons. Get advice on maintenance and day to day usage.

LinkBack Thread Tools Display Modes
Old 18-07-09   #1 (permalink)
Supporting member, Raffle Sponsor 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
Charlieh's Avatar
Join Date: Oct 2007
Location: Staffordshire
Posts: 4,401
346xp old style exhuast mod

ok a little picture thread, I bought this: (sorry about photo quality my camera is on the way out)

anyway it was bought as a non runner, after a bit of messing about i decided the carb was the source of the problem,

poor photo but you can just make out the lump of blue pastic that was sitting under the metering needle spring, causing it to constantly flood the engine,

Once that was solved it ran quite nicely, then I did a muffler mod on it, opening up the exhuast outlet area to about 75% of the exhuast port (i wanted to be a bit conservative as its my first attempt and a smaller saw, so i didnt see the need to go to 85%+)

After removing the exhuast I had to drill two holes and then filed and dremmel out the edges on both the exhuast and the mounting plate, the problem with the 346 exhuast is that it doesnt mount tight up to the mounting bracket so once you have drilled and filed the exhuast you then have to use needle nosed pliers to gently bend the outside of the hole you have created outwards so it touchs the mounting plate,

I also drilled a hole in the internal baffle as well, as i didnt go to the hastle of spliting the muffler apart, i drilled this hole off center to the exhuast port and new opening so it doesnt have a direct line through, my reasoning for this is that if you push the saw into something bushy like a conifer when limbing and a branch does push the screen in at least its not going to push it straight on/into the the piston

I have then just used a small peice of isopon car body repair mesh as a spark arrestor mounted between the exhuast body and mounting plate, just to stop debris entering the exhuast

all told took just over an hour with the retune, which i did by ear need to get it on the tacho really now,

My first impressions are good, the saw pics up revs very fast, it seamingly cuts faster, the noise isnt as bad as i was expecting its certainly quiter than my 254xp (and less vibes and less thirsty). The fuel economy doesnt seem to have been adversly effected and im very happy, I used an older saw for this effort as its not a very tidy job but now i understand how to go about things i would be happier doing it on some of my newer saws, oh and i cleaned the huge amount of build up out of the exhust port which was probably about 1.5mm deep all the way around the port

so far the saw has cut about 2 trailer loads (7ftx4ftx2ft) of logs mounted to my portek log master, on one tank of fuel its great it will go into to timber the full legth of the bar (15") and doesnt drop the revs noticably at all,

my advice.....do it!
Charlieh is offline  
Reply With Quote
Old 18-07-09   #2 (permalink)
Senior member, Raffle Sponsor 2009, 2010, 2011, 2012, 2013, 2014, 2015
18 stoner's Avatar
Join Date: Jul 2007
Location: East Yorks
Posts: 7,664
Re: 346xp old style exhuast mod

Nice one charlieh, you got the bug now then

As a thought, if you do another, perhaps split the can open and remove the baffle completely, make the port on opposite side to the standard one then you wouldnt need the spark screen.

What you have done seems like a real good mod for a smaller saw, quick and cheap! Nice one!
18 stoner is offline  
Reply With Quote
Old 18-07-09   #3 (permalink)
Senior Member, Raffle Sponsor 2007, 2008, 2009, 2010
High Scale's Avatar
Join Date: Jul 2007
Location: SW.
Posts: 6,498
Re: 346xp old style exhuast mod

Nice job, I have split the can on my spare 361 exhaust and pulled the baffle out, splitting the can though, is a pain, I then blew some holes in it trying to weld the holes that the removal of the baffles left.

I have now left the exhaust with a friend who can actually weld.
High Scale is offline  
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
husky 346xp NE and xpg's Charlieh Chainsaws 17 23-06-09 09:24 PM
Body Boarding Somerset Style Tree Man Tom Off topic 5 19-02-09 07:24 AM
Conifer topping (somerset style) andrew Picture Forum 5 21-12-08 08:35 PM
Electro-Arb OZ style! Rowan the Bruce Picture Forum 11 10-07-08 07:49 PM

Find tree care advice

Search Engine Friendly URLs by vBSEO 3.3.0