Going through a 346 OE at work..

[Simondo]

Found this view .. including using a screw to extract as I did.

 

[Redfin]

The plug is a press fit?

 

[Simondo]

The plug is a press fit?

Yes ..it appears to be a interference fit, i didn't notice any glue residue.

 

[XP_Slinger]

Found this view .. including using a screw to extract as I did.View attachment 12487

Excellent visual aid for our planning. Thank you!

 

[psuiewalsh]

Refering back to the 200T. The wear on the piston would cause the al bore to wear out. Replacing the piston and o-ring was a short term fix that would fail again due to the bore. The epoxy actually would fill in behind the piston on the pump side. The brass plug side would just need filled to help with shaft seal or something like that. This eliminated the whole pump and sealed it off. You just use the l needle to set as normal. I run my 200t this way and have not had an issue.

 

[XP_Slinger]

If the pump bore in the carb is serviceable and the pump just needs a cleaning I have an idea of how I can make a new plug.

I can get some slightly over sized brass round stock from our local hardware store and turn it down to size using my redneck lathe (drill and file). It will take a few tries, but I'm fairly confident that I could spin it to the correct diameter.

 

[Simondo]

Excellent visual aid for our planning. Thank you!

Your welcome ..hope it helps

 

[paragonbuilder]

So, at work there is an '01 346xp OE. It has been finicky and a bit unreliable and has been replaced by a 550xp.

I asked my boss if I could go through it and do an overhaul.

I got an OE (OEM) cyl kit, new fuel line, fuel filter, tank vent, carb kit, crank bearings, crank seal, updated intake partition and of course the gasket set.

I got it all back together today and it does run, but it isn't tuning in the way it should. It acts just like an 038 Stihl I worked on recently that ended up having a rip in the intake boot. It runs best (but not the way it should) with the high speed jet almost seated and the low speed about 1-3/4 turns out. I should have known better and got the new intake boot and pulse line. Nothing jumped out at me as a problem as I swapped the two into the new partition... Kinda weird, but anyway I have ordered the intake boot and pulse line. I'm thinking that it might not be getting a good seal for the pulse port on the boot where it mates to the carb unless of course I find an obvious issue with the boot.. We have been working our tails off plowing roads all week and I'm running on 9hrs sleep for the last 3 days combined.. Given that, probably not the best day to assemble a saw. But here is where it sits nevertheless.

So I took some pics as I made progress today.

BTW: It looks like I have a couple more saw jobs lining up on the side soon. I plan to invest my earnings in some needed tools for further work like a Mini Mighty Vac, case separator for saws with stuffers, proper flywheel puller and a few other things....
View attachment 11870View attachment 11872View attachment 11869 View attachment 11871

How did the old piston and cylinder look. Did it need replaced, or was it the carb all along?


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[RIDE-RED 350r]

How did the old piston and cylinder look. Did it need replaced, or was it the carb all along?


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No major damage, but well worn. I would say that the cylinder could be cleaned up using Randy's method and a new piston and it would be fairly good to run.. But the boss opted for the complete topend kit because he wanted to do OEM parts, and Husky's new lower prices on complete cylinder kits made it kind of silly not to go ahead and just do the complete top end.

Crank bearings were going south as well... If held so the light makes it so you can see the bearing races that the roller roll in, you could see some rough texture in them..And you can definitely feel the roughness to the bearings.


But I would say that the poor running/finicky characteristics of the saw were most likely caused by the bad carb/accelerator pump...

Back to the carb:

I took the pump out of the HDA159 while at work today (still waiting on the Zama C3-EL18, new style filter base, and filter retention clip) and found that the piston itself is scored. The O-ring looks and feels like it should still work.. But that O-ring being kind of different with it's being wide and double ringed in one piece, I think it would be difficult to source an adequate replacement... So, the carb is for parts now...

Why the heck did Walbro discontinue production of the accelerator pump kits???!!! To sentence an otherwise good condition complete carb to the trash can for something so trivial as the pump service kit is ridiculous to me!

 

[Simondo]

No major damage, but well worn. I would say that the cylinder could be cleaned up using Randy's method and a new piston and it would be fairly good to run.. But the boss opted for the complete topend kit because he wanted to do OEM parts, and Husky's new lower prices on complete cylinder kits made it kind of silly not to go ahead and just do the complete top end.

Crank bearings were going south as well... If held so the light makes it so you can see the bearing races that the roller roll in, you could see some rough texture in them..And you can definitely feel the roughness to the bearings.


But I would say that the poor running/finicky characteristics of the saw were most likely caused by the bad carb/accelerator pump...

Back to the carb:

I took the pump out of the HDA159 while at work today (still waiting on the Zama C3-EL18, new style filter base, and filter retention clip) and found that the piston itself is scored. The O-ring looks and feels like it should still work.. But that O-ring being kind of different with it's being wide and double ringed in one piece, I think it would be difficult to source an adequate replacement... So, the carb is for parts now...

Why the heck did Walbro discontinue production of the accelerator pump kits???!!! To sentence an otherwise good condition complete carb to the trash can for something so trivial as the pump service kit is ridiculous to me!

Well at least that looks like a confirmed fault….I like to know what was wrong is now changed rather than not being sure the fault is found. Ours is not to ask .."Why" they stopped the service kits , Just to put up with the right "Royal Pain In The Arrrrrs " of dealing with the situation
My Stihl Ms 361 has a pump carb ...Gulp !!

 

[bikemike]

I don't like accelerator pumps on saws. Plug em off and use a torch tip cleaner to make the 2nd and 3rd low curuit a hair bigger. Pumps fail through time.

 

[RIDE-RED 350r]

I don't like accelerator pumps on saws. Plug em off and use a torch tip cleaner to make the 2nd and 3rd low curuit a hair bigger. Pumps fail through time.

Hmm... I didn't know there WAS a 2nd and 3rd low circuit.. These little carbs are proving more complex than I ever gave them credit for!

What is your material of choice to plug off the pump?

For that matter, I need a little edgemecation on the 2nd and 3rd low circuits! Specifically their locations..

 

[bikemike]

Hmm... I didn't know there WAS a 2nd and 3rd low circuit.. These little carbs are proving more complex than I ever gave them credit for!

What is your material of choice to plug off the pump?

For that matter, I need a little edgemecation on the 2nd and 3rd low circuits! Specifically their locations..

If you look at the throttle butterfly you should se 2 or 3 holes in the bore. Then closer to the choke is ur main fuel nozzle. The 2 or 3 holes is for the low needle curuit. It helps the transition from Idle

 

[RIDE-RED 350r]

GUYS!!! Is this real??!! http://www.smallenginesprodealer.co...embly-kit-part-160-519-1-walbro-original-oem/

Been doing some digging and figured out that the Walbro part # is 160-519. Seacthed that and am finding what APPEARS to be the pump service kit in stock with a few vendors????

 

[RIDE-RED 350r]

Well, I just placed an order for 3 kits from this vendor http://www.smallenginesprodealer.co...embly-kit-part-160-519-1-walbro-original-oem/

We'll see what happens.... I'll keep you guys posted.

 

[Locust Cutter]

WHat did you do with the old P&C? Those might be useful to someone...

 

[RIDE-RED 350r]

WHat did you do with the old P&C? Those might be useful to someone...

I still have them and I am not sure what will be done with them as those parts belong to the town (my employer).

On the accelerator pump service kits... I have bad news and good news..

Bad news: The vendor I placed the order with last night for 3 pump piston kits has refunded my money. So this indicates that they do not have them...

Good news: I decided to email Walbro corporate last night. I more words than this, I asked that they consider reinstating the pump service kits. I stated that many people prefer the Walbro HDA over their Zama counterparts and would rather repair these carbs with faulty accelerator pumps quickly and cost effectively than throw them in the trash. A corporate manager promptly replied today and stated that Walbro had never made these kits available in the past, but that he would certainly consider making the kits available to us through them and their distributors. I was unaware that these kits have never been offered in the first place because vendor parts pages indicate that hey are NLA, which would lead me to believe that at one time they were...

I would copy/paste his reply, but there is a privacy notice attached to his replay prohibiting me from doing that.

So anyway, here's hoping Walbro helps us out and makes these kits available!

 

[Tor R]

Good news: I decided to email Walbro corporate last night. I more words than this, I asked that they consider reinstating the pump service kits. I stated that many people prefer the Walbro HDA over their Zama counterparts and would rather repair these carbs with faulty accelerator pumps quickly and cost effectively than throw them in the trash. A corporate manager promptly replied today and stated that Walbro had never made these kits available in the past, but that he would certainly consider making the kits available to us through them and their distributors. I was unaware that these kits have never been offered in the first place because vendor parts pages indicate that hey are NLA, which would lead me to believe that at one time they were...

I would copy/paste his reply, but there is a privacy notice attached to his replay prohibiting me from doing that.

thank you for checking up this, apreciate your effort, with luck, maybe walbro will make those acc pump avaible for us I for sure will buy some kits.

 

[dall]

i ordered from him before and he did the same thing to me after a week and a couple emails asking why it hadnt shipped

 

[RIDE-RED 350r]

Maybe you other gents who would be interested in accel pump service kits might consider dropping a friendly email to Walbro and expressing that interest to them?

The more people who contact them, the higher the likelihood that they will make these kits available.