Author Topic: Micro Carburation issues...  (Read 413 times)

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Offline Drew_Uth

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Re: Micro Carburation issues...
« Reply #10 on: December 01, 2016, 10:51:55 am »
So, I am having a lot of trouble getting the crank seals.  I see them advertised for the $3-4 price, but they are all NLA.  Two local Husky dealers in my area have basically told me GFY, they are of no help.  Anyone have a source?  At that price, I would by 6 seals.  There are some on eBay at around $9 plus shipping...those are my last resort I guess.

Offline Cut4fun .

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Re: Micro Carburation issues...
« Reply #11 on: December 01, 2016, 02:18:24 pm »
I'm in on a break from cutting deer. Post part # and I'll give a quick look before I go back out.
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Offline Drew_Uth

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Re: Micro Carburation issues...
« Reply #12 on: December 01, 2016, 03:55:24 pm »
530019059

Offline Cut4fun .

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Re: Micro Carburation issues...
« Reply #13 on: December 01, 2016, 06:15:32 pm »
530019059

The main place that sells them OrderTree.com shows them NLA again too.  So till they restock like that have in past if we get lucky. Going to have to find NOS or bite the bullet and pay the shipping.

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Offline Cut4fun .

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Re: Micro Carburation issues...
« Reply #14 on: December 01, 2016, 08:52:35 pm »
@Drew_Uth  How many you need? I found 5 at $6 apiece plus shipping will be $3 for all of them. Then shipping to you if we split the order.
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Offline Drew_Uth

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Re: Micro Carburation issues...
« Reply #15 on: December 02, 2016, 02:21:17 pm »
Well I wanted 6 but I will settle for 2 to get one up and running 100% and confirm that they fix the issue.  Shipping to 08215 for me.

Offline Cut4fun .

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Re: Micro Carburation issues...
« Reply #16 on: December 02, 2016, 04:18:29 pm »
Well I wanted 6 but I will settle for 2 to get one up and running 100% and confirm that they fix the issue.  Shipping to 08215 for me.

I dont have them in hand. That is what I can get them for shipped to me.  5x $6 + $3 = $$33 for 5 to my door.   

I can show you so you can buy them all and bypass me. ?
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Offline Drew_Uth

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Re: Micro Carburation issues...
« Reply #17 on: December 05, 2016, 10:50:37 am »
Sure, if you can let me know your source that would be great.  I will likely just order 4.  Thanks!

Offline Cut4fun .

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Re: Micro Carburation issues...
« Reply #18 on: December 05, 2016, 11:13:47 am »
Sure, if you can let me know your source that would be great.  I will likely just order 4.  Thanks!

PM sent.
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Offline Eccentric

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Re: Micro Carburation issues...
« Reply #19 on: December 06, 2016, 06:58:15 am »
Because both the H and L circuits of the carb feed from the same metering chamber, the barometric pressure of the metering chamber must be kept below atmospheric barometric pressure or the fuel stops flowing.  The high speed nozzle which is fed by the H circuit, has a check valve contained somewhere in its system to prevent atmospheric barometric pressure from seeping past its check valve and back into the metering chamber.  Some of these valves are screens that are wetted by fuel, and others are of a mechanical check valve style.  The mechanical check valve style nozzle has been more problematic than the screen type.  All of the screen type systems are serviceable, but the mechanical check valve types are not.  The reason is some of the components are not sold by the carb manufacturer.  I guess they want you to buy a new carb?  Navigate over to Walbro's website and look up the carb.  The parts listing will show which components are used.  Before I bought any carbs or parts though I would go with what Eccentric posted and replace the seals and all of the fuel line.                   

Good info.  The HDA164 carbs come to mind when talking about problematic mechanical check valves.

When I worked for Sears Service in the early 1990's, a Poulan rep came by the shop one day.  One of the topics he covered while talking with us was the WA/WT Walbro carbs used on basically all of the Poulan manufactured 2-stroke machines that Sears sold.  I remember him admonishing us to NOT blow out the carb bodies with high pressure compressed air, as the non serviceable mechanical check valves in those carbs can easily be damaged that way. 

We also discussed the large number of WA/WT series carbs that we were having unsuccessful rebuilds with.  The failure rate was high enough that we were replacing carbs on warranty work instead or kitting them (and were attempting to talk non-warranty customers into replacing the carbs rather than rebuilding).  Our list cost for the carbs was about 2X the price of the kits.  The book labor charge for replacing the carb was 1/2 the book cost for rebuilding the carbs.  For the customers, it was basically a wash..............and we could bang out the job while they waited.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.
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