Black64galaxie 65 #1 Posted January 30, 2016 Well I picked up this 520 h a few weeks ago and it needed some work. It seemed to hunt quite a bit. I bought the 150 dollar carb kit,intake& exhaust gaskets. Took the carb apart cleaned it. Split the intake and sealed it with a grey permatex. Don't know if it was the correct thing to use cause it's not getting rubbery enough. Well anyway put it all back together and it runs worse now. I'm thinkin it's flooding now. Blowing black . Still hunts and not running right. It's worse than it was when I got it. I'm thinking the float is not correct. And the sealant I used wasn't correct. It was supposed to be gas resistant but it doesn't get hard enough. Still suckin air? Take it all back off again for the 3rd time. Any advice what to do. What sealant to use? Scott Share this post Link to post Share on other sites
WNYPCRepair 1,923 #2 Posted January 30, 2016 It is most likely dirty, here are a couple of recent posts on the subject Share this post Link to post Share on other sites
Ed Kennell 42,108 #3 Posted January 30, 2016 I would clean the carb again...make sure every hole is open and clean. It took 3X to get mine clean. Are you sure it isn't getting reclogged from dirty fuel lines ? 1 Share this post Link to post Share on other sites
lynnmor 7,846 #4 Posted January 30, 2016 There is a welch plug on the side of the carb., just above the mixture screw, make sure that it didn't fall out. If you haven't removed that plug, there may be dirt behind it. Share this post Link to post Share on other sites
Black64galaxie 65 #5 Posted January 30, 2016 I cleaned it all out 2 times. I did not take out that blow out plug though . I thought the sealer was getting bad between the two halves of the intake and resealed that up but I'm going to take it apart again and epoxy it together forever so I know it won't leak. I put all new lines and filter in. I'm thinkin it's flooding though too. intake looks wet. I'll keep at it it ran better before I did it so I must of screwed somethin up! Share this post Link to post Share on other sites
WNYPCRepair 1,923 #6 Posted January 30, 2016 2 hours ago, Black64galaxie said: I cleaned it all out 2 times. Not to make light of your abilities, because I am certainly no mechanic, but I have seen numerous people say they cleaned it numerous times, and then go back and clean it and it runs great. Make sure you get the main jet 1 Share this post Link to post Share on other sites
lynnmor 7,846 #7 Posted January 30, 2016 If you think it is flooding, an air leak in the manifold would give the opposite effect. Did you drill thru and bolt the manifold back together at each rivet location? Did you shake the floats to see if they might contain gas? Since you have a new needle and seat, did adjust the float level? You usually don't have to remove the welch plug, but there is a cavity behind it that can be cleaned by blasting parts cleaner into all openings after the jets and mixture screws are out. Share this post Link to post Share on other sites
Black64galaxie 65 #8 Posted January 30, 2016 (edited) well. I took off The manifold again and carburetor. I cleaned the carburetor again and took out that freeze plug and made sure the three holes were clear everything looks real good inside I don't understand. I epoxied the two manifold halves together and bolted it down tight so there should be no air leaks on there. I did not bolt the rivet areas but it is not leaking there it is sealed up nice and tight with the bolts from the manifold and the carburetor . I put it back together and tried running it and it is still searching and runs rough. The spark plugs are black. The floats look good I shook them there doesn't seem to be anything in them they don't feel heavy. I have rebuilt many carbs but I just don't understand this is such a simple carb. It actually ran fairly decent before it just hunted a little bit so I thought I would clean it out now it seems much worse. As it sits without running I can see some gas coming out of the front of the shaft on the butterfly would something be leaking through there.the kit just comes with a needle and no seat. Edited January 30, 2016 by Black64galaxie Share this post Link to post Share on other sites
JackC 617 #9 Posted January 30, 2016 What year is it? Does it have the low emissions carburetor with the accelerator pump? If so there is a kit for the pump. Personally I would replace the low emissions carburetor with an older new or used non emission one. Share this post Link to post Share on other sites
Black64galaxie 65 #10 Posted January 30, 2016 1990 . No pump on carb. Pump seems to pump fine. Scott Share this post Link to post Share on other sites
wheelhorseman 3,237 #11 Posted January 31, 2016 (edited) This sounds a lot like my experience with my 520, I cleaned the carb on it about 5 times (you could preform surgery on any internal part it was so clean) then I put it all back together and it still (hunted). So after I pulled some more of my hair out and some more of this and this I broke down and bought new spark plugs (about $10 each) installed them and it purred like a kitten Edited January 31, 2016 by wheelhorseman1000 Share this post Link to post Share on other sites
Black64galaxie 65 #12 Posted January 31, 2016 (edited) I'll give it a try. They were really sooty so I blasted them in my cabinet nice and clean . But I'll give that a try. Is there a certain number and brand that's correct? Edited January 31, 2016 by Black64galaxie Share this post Link to post Share on other sites
wheelhorseman 3,237 #13 Posted January 31, 2016 I just went to the auto parts store and told them that I needed plugs for a 20 hp onan and they looked them up. And I also wire wheeled my plugs before I bought new ones Share this post Link to post Share on other sites
Martin 2,133 #14 Posted January 31, 2016 (edited) did you pull this needle and check to see if its clear? more on this here...... http://www.wheelhorseforum.com/topic/43225-416-adventures/?page=2#comment-396587 Edited January 31, 2016 by Martin Share this post Link to post Share on other sites
Black64galaxie 65 #15 Posted January 31, 2016 Martin. Glad you chimed in. Terry the decal guy. said you are the guru on these. You know what but I don't remember if there was even one on there!! Someone must of been in there before because I don't remember screwing that out of there ! I will have to open up the top again tomorrow. Thanks for the photo. Share this post Link to post Share on other sites
Martin 2,133 #16 Posted January 31, 2016 23 minutes ago, Black64galaxie said: I'll give it a try. They were really sooty so I blasted them in my cabinet nice and clean . But I'll give that a try. Is there a certain number and brand that's correct? I use same plug as was installed from factory, Champion RS17YX. Ive never had problems with hunting or surging from plugs, all of my problems were caused by dirty carb, or poorly working governor assembly, which can range from internal to something as simple as a throttle spring placed in the wrong hole on the bracket, causing incorrect sensitivity with the governor. 1 Share this post Link to post Share on other sites
Ed Kennell 42,108 #17 Posted January 31, 2016 (edited) Make sure the 4 holes in the throat are open and clean. Edited January 31, 2016 by ekennell Share this post Link to post Share on other sites
Black64galaxie 65 #18 Posted January 31, 2016 Yes had the carb cleaner blowing through those good too. I'll hafta look into that top jet. I don't really remember one in there. I don't know how it ran with that out? Share this post Link to post Share on other sites
JackC 617 #19 Posted January 31, 2016 (edited) 1 hour ago, Martin said: which can range from internal to something as simple as a throttle spring placed in the wrong hole on the bracket, causing incorrect sensitivity with the governor. "spring in wrong hole" I have run into that. Are these the correct holes? Edited January 31, 2016 by JackC Share this post Link to post Share on other sites
Black64galaxie 65 #20 Posted January 31, 2016 I'll look into that also. Thanks for picks! Share this post Link to post Share on other sites
Martin 2,133 #21 Posted January 31, 2016 (edited) 10 hours ago, JackC said: "spring in wrong hole" I have run into that. Are these the correct holes? Jack, If you look in the manual, the position in your first pic is one too high. Manual shows the spring in the middle hole. The second pic yours is in the second hole from the pivot, manual states in the text and pic that from the factory the spring is placed in the third hole from the pivot. These are baseline settings. The text also explains the procedure for checking the linkage position (at C) first, then if you feel the need to adjust for sensitivity then to adjust the governor spring position on the governor arm. We have side pull governors so the left pic is the one we need to look at. Edited January 31, 2016 by Martin 1 Share this post Link to post Share on other sites
Black64galaxie 65 #22 Posted February 1, 2016 23 hours ago, Martin said: did you pull this needle and check to see if its clear? more on this here...... http://www.wheelhorseforum.com/topic/43225-416-adventures/?page=2#comment-396587 That was the culprit! No jet in there!!! Share this post Link to post Share on other sites
Ed Kennell 42,108 #23 Posted February 1, 2016 Didn't the $150 carb kit have a new jet ? 1 Share this post Link to post Share on other sites
Black64galaxie 65 #24 Posted February 1, 2016 No. U sure would think though huh? Share this post Link to post Share on other sites
Martin 2,133 #25 Posted February 1, 2016 26 minutes ago, ekennell said: Didn't the $150 carb kit have a new jet ? the $150 kit should come with a new carb, not just a jet!!!! 2 Share this post Link to post Share on other sites
