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Post by james64 on Oct 14, 2023 23:57:45 GMT -5
As I posted before, I broke the forks off two SDC48 carbs. The forks that hold the inlet valve on the circuit plate. The arm was sitting too high so if I bent the arm down, the valve would not raise when the arm was pushed and likwise if I bent the forks up so the valve would lift when the arm was pushed, the tip of the arm was sitting too high. This went back and forth until the forks broke off so now I have two carbs that are useless unless I can find two Walbro circuit plates with the arm intact. I also have an SDC65 and the arm is sitting right where its supposed to be but the damn thing leaks down when I pressurize it and this is with new gaskets so I don't get it. Leon makes it look so easy. Ive watched just about all of his videos dealing with carbs. I just don't get it... Frustrated in Oklahoma
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Post by blythkd on Oct 15, 2023 5:39:13 GMT -5
Finding more parts shouldn't be bad. There's lots of those carbs out there. Might just find some scrap carbs for parts.
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Post by bobby167 on Oct 15, 2023 6:50:40 GMT -5
As I posted before, I broke the forks off two SDC48 carbs. The forks that hold the inlet valve on the circuit plate. The arm was sitting too high so if I bent the arm down, the valve would not raise when the arm was pushed and likwise if I bent the forks up so the valve would lift when the arm was pushed, the tip of the arm was sitting too high. This went back and forth until the forks broke off so now I have two carbs that are useless unless I can find two Walbro circuit plates with the arm intact. I also have an SDC65 and the arm is sitting right where its supposed to be but the damn thing leaks down when I pressurize it and this is with new gaskets so I don't get it. Leon makes it look so easy. Ive watched just about all of his videos dealing with carbs. I just don't get it... Frustrated in Oklahoma Were the carb kits OEM ? |
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Post by james64 on Oct 15, 2023 14:04:26 GMT -5
Yes they are Bobby and I'm glad you brought that up because the little nub on the diaphram that Leon is always warning us about on Chinese kits being too tall were way too tall on the Walbro kits I brought. I went searching and found the Stens kits has the diaphrams with the right nub so obviously Walbro doesn't give a damn about the accuracy of their parts.
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Post by bobby167 on Oct 15, 2023 14:16:37 GMT -5
Yes they are Bobby and I'm glad you brought that up because the little nub on the diaphram that Leon is always warning us about on Chinese kits being too tall were way too tall on the Walbro kits I brought. I went searching and found the Stens kits has the diaphrams with the right nub so obviously Walbro doesn't give a damn about the accuracy of their parts. I have had no problem with OEM walbor kits, it's the cheap ones from china. Lots of knock off parts being passed as OEM. Suggestion on checking for leaks. If you cannot locate it, pressurize the carb and place it in some water. It will bubble where it is leaking from. Make sure you dry carb off when done. If you don't locate the arm for the needle, let me know. |
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Post by james64 on Oct 15, 2023 14:22:17 GMT -5
The packaging on these Walbro kits looked legit but now I'm wondering if they are counterfit. Dropping the carb in to water was going to be my next move. I look on Ebay every day for a couple of carbs I could cannabilize the arm from but so far no luck. I assume that any Walbro SDC carb will have the same circuit plate. Am I wrong about that?
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Post by bobby167 on Oct 15, 2023 14:45:56 GMT -5
The packaging on these Walbro kits looked legit but now I'm wondering if they are counterfit. Dropping the carb in to water was going to be my next move. I look on Ebay every day for a couple of carbs I could cannabilize the arm from but so far no luck. I assume that any Walbro SDC carb will have the same circuit plate. Am I wrong about that? They should. I have lots of used carbs. Possibly the same number as you have. Have the arms for the needle, new ones. Over the years I have bought out 4 or 5 old Homelite dealers stock. I would ask you to check with Leon first. If you cannot find parts, let me know. |
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Post by james64 on Oct 15, 2023 15:30:43 GMT -5
Email sent to Leon. I'll let you know what he says.
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Post by james64 on Oct 15, 2023 18:17:37 GMT -5
Leon is going to take care of these two carbs for me and when I get them back, I'm going to use one of them as an example because I have five other saws that need to be rebuilt and I want to be able to rebuild these carbs myself. I know at least two of the saws have Zama carbs in them. I have three short blocks I have cleaned up that I will possibly put in to other cases I have bought but right now I'm not sure which direction I'm going to go as these short blocks are are my practice motors. The other saws I have are all intact saws and I want to keep them together as a whole.
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Post by james64 on Oct 15, 2023 19:50:02 GMT -5
The packaging on these Walbro kits looked legit but now I'm wondering if they are counterfeit. Dropping the carb in to water was going to be my next move. I look on Ebay every day for a couple of carbs I could cannabilize the arm from but so far no luck. I assume that any Walbro HDC carb will have the same circuit plate. Am I wrong about that? |
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Post by bobby167 on Oct 16, 2023 7:52:37 GMT -5
Leon is a super guy to deal with. Good to hear you contacted him.Those saws are easy to work on, just take your time. Suggestion, is to take pictures of taking saw apart. That way you can go back and look, if you are not sure of how it goes back together. Carb's can be frustrating to work on. Once you do a few, it will get easier.
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Post by blythkd on Oct 16, 2023 11:45:14 GMT -5
It's been my impression that the problematic aftermarket carb kits for Walbro carbs with the bad metering diaphragms were HDC kits. The SDC metering diaphragm is totally different with the longer slotted center post that the metering lever hooks into. If there's been a problem with SDC kits, I guess I missed it.
Am I all wet?
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Post by bobby167 on Oct 16, 2023 15:48:03 GMT -5
It's been my impression that the problematic aftermarket carb kits for Walbro carbs with the bad metering diaphragms were HDC kits. The SDC metering diaphragm is totally different with the longer slotted center post that the metering lever hooks into. If there's been a problem with SDC kits, I guess I missed it. Am I all wet? Good point. No, you are not. I would rather use OEM or NOS parts. You have a better chance of getting bad kits from the cheap China ones. Yea, sometimes the OEM ones will have a bad run. I have not found any OEM bad kits, yet. When repairing a customer's saw, I won't take that chance. We know what it takes to remove / clean / test / install a carb. I personally want it done right the first time. It's just the way I prefer to do it. |
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Post by james64 on Oct 16, 2023 15:51:19 GMT -5
It's been my impression that the problematic aftermarket carb kits for Walbro carbs with the bad metering diaphragms were HDC kits. The SDC metering diaphragm is totally different with the longer slotted center post that the metering lever hooks into. If there's been a problem with SDC kits, I guess I missed it. Am I all wet? I meant to say HDC in my original post. I'm still learning about these saws and I had it in my head SDC but that is wrong. Sorry for the confusion. I suspect the Walbro kits I bought are counterfeit. |
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Post by james64 on Oct 16, 2023 16:10:36 GMT -5
Leon is a super guy to deal with. Good to hear you contacted him.Those saws are easy to work on, just take your time. Suggestion, is to take pictures of taking saw apart. That way you can go back and look, if you are not sure of how it goes back together. Carb's can be frustrating to work on. Once you do a few, it will get easier. I have always taken pictures of things I'm taking apart for the first time. My computer has thousands of pictures of various things but these saws are fairly simple and I do have the IPLs to refer to. I have rebuilt literally hundreds of Honda 3wheeler carbs so I'm no stranger to taking carb apart in fact, me and one other guy are soley responsible for providing the vast 3wheeler community with rebuilt carbs. Early on I realized that you can rebuild a carb but unless you actually run it on an engine, there is no way of validating whether it actually works or not so I gathered up engine parts and put together a 3wheeler engine and mounted it to the top of one of my toolboxes. The carbs I rebuild are for about 5 different models of 3wheeler and they are all electric start so starting the engine is push button but if I were testing these carbs in the actual bike, it would take me an hour or so to install, test, remove and reassemble the bike but on my test stand, it takes me less than a minute to install it another few minutes to test and less than a minute to remove. My test stand makes it pretty easy to test. I mounted the engine on top of a Harbor Freight 5 drawer mechanics box but I still wanted access to the area under the lid so I mounted four linear actuators to the lid, added a battery, and a control box. Now when I need something under the lid, I hit a switch and the whole thing raises up as much as 10 inches so I put stuff under there I don't use very often. My test stand has a full exhaust and a cut down wiring harness so it functions exactly as it would in a the bike. the motor weighs right at 100lbs and each linear actuator can lift 250lbs so there is more than enough lifiting power to lift the engine. I surprise myself sometimes. I shoud have gone to college and become an engineer.         |
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