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Hot!Husqvarna 435 runs super hi after carb rebuild

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womanvchainsaw
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2020/06/25 22:33:13 (permalink)
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Husqvarna 435 runs super hi after carb rebuild

I rebuilt the carburetor on my Husqvarna 435 and now it starts fine -- more than fine!  It's running like it's at NASCAR!  I checked the fuel lines for an obvious vacuum leak, but didn't see any fuel leaking.  I tried adjusting the idle, but nothing happens when I turn the screw.  What did I mess up in the carburetor?  This carburetor is not the easiest to remove - not like an Echo, so I'm thinking I didn't reassemble it correctly. 
 
I did replace the clutch and drum on my Husq 55 and this fixed the issue as I thought it should.  Just goes to show the local repair shop is no match for a forum!  It's pretty frustrating to have a repairman insist that I just have the wrong chain as if I'm not smart enough to put the proper chain on the saw.  Thanks for all the help on that.
 
 
 
 
 
 

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    AVB
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/26 08:32:42 (permalink)
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    What are the tach readings? Most rebuilt carburetors will need re-tuning.
     
    Idle speed should 2900 rpm and max no load speed should be 12500 -13000, speed limitation.
    Roy
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/26 12:12:24 (permalink)
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    Did you remove the throttle plate? If so it may not be centered in the bore. Remove the carb, back off the idle seed adjustment then loosen and retighten the plate screw.
    AVB
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/26 12:19:01 (permalink)
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    Roy
    Did you remove the throttle plate? If so it may not be centered in the bore. Remove the carb, back off the idle seed adjustment then loosen and retighten the plate screw.

    Something I didn't think of as I don't normally remove them.
    womanvchainsaw
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 01:43:48 (permalink)
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    I don't have any way to check the idle speed aside from "sounds way too fast."  I may be in over my head on this one as the carb has three little round "gates" rather than just the one.  Under the diaphragm that I replaced with the new one from the carb kit, is a needle and spring arrangement.  Is the screw there an adjustment or does it just hold the parts on?  Is the needle part supposed to have the yoke on its little collar so it can lift it?  I tried to scan the thing, but it's pretty dark. 
     
    Sorry I'm incompetent.   

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    Roy
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 11:29:07 (permalink)
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    The screw retains the inlet needle and spring which pops out and disappears in never never land under the bench if you are not careful. The pin in the centre of the diaphragm hooks into the tang on the lever. Set thew idle speed just below where the chain starts to turn when the engine is warm.
    AVB
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 12:08:50 (permalink)
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    The OP has a C1T-EL41 which is a air head version. One valve is air only, one is the choke, and the other is throttle.
     
    The metering diaphragm does not hook into the metering lever. But the metering lever does hook into the metering needle valve. The metering lever end that touches the diaphragm height is adjusted so when a straight edge or the Z tool is lay across the carburetor body it barely touches it. You either gently pry up of press on the lever to adjust the height. For reference below is the metering diaphragm. The side shown is side that goes next to the lever.

     
    post edited by AVB - 2020/06/27 12:11:12
    womanvchainsaw
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 12:50:47 (permalink)
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    So the screw that holds the pin-lever arrangement needs to be tight, or is this an adjustment?  Making it tighter does seem to limit the movement.  The lever part has a spot for the spring.  I thought it was an indented circle that fit into the spring, but maybe I have it upside down and the spring fits into the cup of the indention.  I'd experiment by doing it both ways, but this carburetor is really a pain to install - not at all like the carburetor in the Echo saws. 
     
    Good tip on the spring.  I did remove the needle to make sure it wasn't clogged, but saw the spring before I disassembled it and kept it in hand.  
    md salam
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 15:09:29 (permalink)
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    Yes, will repair it. Mr. mechanic has told you right. 
    You need to know more about it, you can do a Google search, with the desired keyword.
    If I don't understand these things, I do search to google.
    so you can do it.
    besides, Husqvarna 435 has some problem but Husqvarna 455 has no problem and it is perfect for you.
    Thank you.
    post edited by md salam - 2020/08/05 05:49:24
    womanvchainsaw
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 16:08:00 (permalink)
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    Well, I reassembled the 435, and if nothing else, I'm making the same mistakes over and over as it does the same thing.  Starts fine, but idles really, really high.  I did manage to get the idle down with the idle screw, but once the chain finally stops turning, the saw doesn't idle down and quit like you'd think - or maybe just me thinking - but idles back up to supersonic in just a second or two.  Like it's revving itself of its own volition.  And it's not just the chain turning lazily;  it's screaming.  
     
    So I guess I'll have to take it somewhere on Monday.  I did get a number for a guy who does repairs (the one who said it sounded like a vacuum leak), but it's a 2 1/2 hour round trip and a two-month wait.  So I'll check back with the diagnosis when I get it back.
     
    Thanks for all the help.  I learn a little more every time I work on the saws, but alas, I'm told that puts me out of the trifecta of local repair shops, i.e. fuel filter, air filter and spark plug.
     
     
    AVB
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 16:18:27 (permalink)
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    Maybe this will help with the metering lever. Sorry not respond sooner but I am working in shop.

    post edited by AVB - 2020/06/27 16:19:46
    womanvchainsaw
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 16:22:24 (permalink)
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    Thanks for the photo.  I think I have that installed okay, and it leveled with the carb body as directed.  I had removed it to check for blockage, but it was pretty clean.  
     
    Sorry to bother everyone.
    Roy
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/06/27 21:34:53 (permalink)
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    No need to apologize. This is what we are here for, everybody has to learn sometime.
    TownsendsFJR1300
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/01 19:55:12 (permalink)
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    .
    post edited by TownsendsFJR1300 - 2020/07/18 16:29:28
    womanvchainsaw
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/01 20:24:38 (permalink)
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    I do have the tool to adjust the L and H, but they can't be that out of wack (did the 1 1/4 turn recommended) to have the idle that high.  The carburetor does connect to the saw with this weird plastic thing that is really difficult to remove and replace.  I'm wondering if it's that.  I might look over a part diagram and see if there is a gasket available for that.  It doesn't seem to serve a mechanical purpose - just separates the carburetor from the cylinder.  I'm not the only one who has removed that "spacer" and not sure how it's supposed to look.  
    AVB
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/01 23:06:26 (permalink)
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    You are way too lean.
     
    Here are the initial settings from the service manual:
     
    Replacement of the H-needle or complete carburetor
    1. Carefully screw the new H-needle to the bottom and turn it anticlockwise ”A” turns.
    435/e A = 2

    2. Start the engine. If necessary, adjust the idling speed with the T-screw until the chain stops.
    3. Adjust the H-needle to give a top speed of ”B” rpm. Use a tachometer.
    435/e B = 12500 -13 000, speed limitation.
     
    Note: if you are exceeding 13,000 rpm enrich the mixture to slow down to the max rpm.

    4. Let the engine run at ”B” rpm ~ 1 minute, until warm.
    Replacement of the L-needle
    1. Screw the new L-needle to the bottom and then turn it counterclockwise ”D” turns.
    435/e D = 2,5


    Also your idle rpm should be 2900 rpm. Plus make you set both of the mixture needles before any other adjustment since you have reworked the carburetor.
    post edited by AVB - 2020/07/01 23:11:03
    womanvchainsaw
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/01 23:09:19 (permalink)
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    Looks like this weird thing between the carburetor and the cylinder is called the "inlet pipe."  It doesn't seem to have a separate gasket.  What on earth does this part do I wonder?!  I'll pull my saw apart tomorrow and have a look, though I'm not sure what I'm looking for exactly.  This might indeed be the trouble.  I could try the spray-carb-cleaner-around technique for leak detection, but the idle is so high I'm afraid to leave it running for any length of time.  Thanks for the insight.
    TownsendsFJR1300
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/02 07:16:41 (permalink)
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    post edited by TownsendsFJR1300 - 2020/07/18 16:40:04
    AVB
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/02 07:32:12 (permalink)
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    PN 504201201

    TownsendsFJR1300
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    Re: Husqvarna 435 runs super hi after carb rebuild 2020/07/02 07:42:53 (permalink)
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    post edited by TownsendsFJR1300 - 2020/07/18 16:40:49
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