NE 346XP - Affects of Cat Muffler & Muffler Mod - Porting & Popup To Come

[bjorn773]

Thanks Brad. I didn't intend to hijack your thread, but one question snowballed into many. I appreciate your help.

 

[blsnelling]

Thanks Brad. I didn't intend to hijack your thread, but one question snowballed into many. I appreciate your help.

No problem. It was inactive anyway.

 

[bjorn773]

IT'S ALIVE... She fired right up and runs very well. I discovered my oil cap is cracked(translation: oil all over the driveway), so I'm off to the dealer to get a new cap. Then I'll shoot a vid and post if I can remember how.

 

[blsnelling]

Excellent

 

[bjorn773]

Here's a link to my video. I couldn't get the imbedding to work.

http://www.youtube.com/watch?v=pCQl7tt3C70

 

[blsnelling]

Here's a link to my video. I couldn't get the imbedding to work.

http://www.youtube.com/watch?v=pCQl7tt3C70

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[bjorn773]

Thanks, how did you do that? And, how do you think it sounds?

 

[TRI955]

Looks good, can't hear it though, no sound at work. What kind of chain and wood??

 

[bjorn773]

Woodland Pro Chisel from Bailey's and soft maple. I'm anxious to see how it does in hardwood, but don't have any to try.

 

[nmurph]

to wake up an older thread. i have two of these done and have not experienced any problem until this weekend. it was very hot and they were run for extended periods. mine problem doesn't seem to be so much of the leaning out as it is a slightly unstable idle and a tendency for them to be difficult to re-start after shutdown. i do think it is a problem with the vent as the problem is more evident with a full tank. i have both saws set a little rich still and this might be why i haven't noticed the progressive leaning-out. the saw which is ported more aggressively is definitely more prone to difficult re-start. the other saw just got some minor port work and a pretty substantial muffler mod. the saw which has more porting work is running a cat muff which i have guttted as much as possible with a grinder and drill bits. i plan to pull it apart and totally remove the cat element.
to clarify, i need to remove the vent and enlarge the opening in the tank? the "stone" part of the vent is fine?

 

[bjorn773]

That was my understanding and how I did it. I removed the vent filter and used a very small drill bit to open it up. Look back in the thread for the exact sizes. I found them at a hobby store, it's way too small a size for a hardware store to stock. Let us know how it works. I honestly have not used mine yet, other than the initial test after reassembly. I hope to do so in the coming weeks.

 

[nmurph]

well, i opened the saw yesterday just to have a look, and the piston already has some light scoring on the exhaust side. the rings actually look fine (one very, very, tiny scuff) but i am replacing the piston. the was only a little bit of transfer on the cylinder and i took a few minutes to clean it.

it will definitely have the tank vent situation rectified bf it hits the woods again.

 

[Carl Anderson]

OK, so I want to do a muffler mod soon but I'm not going to port it (if I ever do that it will be sent to one of you guys who know what you're doing). I have the non-cat 346xpNE and a couple questions.

1. If I'm reading all of this correctly I don't need the non-limiting coil if I'm just doing the muff mod but it's a good idea if I can get one for a decent price. Is that correct or am I really much better off just getting the non-limiting coil? Money is tight so if I can avoid pricey new parts that would be great.

2. With my non-cat muffler, all I have to do is get that different deflector and screen and open up the exit hole to match the footprint of the new deflector? Is that right, I don't have to take the muffler apart or do any fancy metal work?

Sorry if these questions have been answered. I really have been reading up but I just want to be sure of what I'm doing

Thanks!

 

[Log Hogger]

If you swap out the carb for a Zama C3-EL42, you will have an extra line coming from the fuel tank that used to hook up to the primer bulb. Why not put a vent on that line and secure it someplace in the carb area? Whether a 357 carb offers any benefits is another matter...