hummod 0 #1 Posted December 19, 2011 I have a Lauson H55B on a Suburban 550 that I am trying to get running correctly. I have already cleaned and installed throttle shaft bushings on the tillotson carb. Engine starts and runs but rpm is all over the place with no idle at all. I think there is a problem with the governor gear because the governor arm moves loose no mater what the rpm and nothing seems to hold the throttle closed with the engine not running. Does anything put force on the governor arm to hold the throttle closed at idle? I am only familar with Kohler engines and their governor springs. Larry Sayre, PA Share this post Link to post Share on other sites
stevebo-(Moderator) 8,538 #2 Posted December 19, 2011 I believe they suppose to have small springs. I will see if I can find a few pics. Share this post Link to post Share on other sites
stevebo-(Moderator) 8,538 #3 Posted December 19, 2011 Here is a pic Thought I had more ... Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #4 Posted December 19, 2011 The flyweights/thimble on the governor gear push the lever connected to the governor shaft as soon as the engine is running, which should close the throttle plate in the carb. It's the same principal used on Kohler, B&S, Wisconsin, etc. Share this post Link to post Share on other sites
hummod 0 #5 Posted December 19, 2011 I was suspecting that there was no spring that would pull the throttle closed at idle. The fly weights on the governor gear should start moving the governor arm as soon as the engine rotates. The higher the rpm the more force on the governor arm. I have no force on the governor arm at all at any rpm. Could there be a problem with the flyweights on the gear? Would it be worth taking the side off and looking? All external governor parts are there and look to be correct from the throttle cable to the carb. I can get the engine to run stable if I add an extra spring to hold the throttle shaft against the idle stop. The extra spring throws the whole system out of balance and prevents the throttle control from working properly. Larry Sayre, PA Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #6 Posted December 19, 2011 Yes - I would say an internal inspection is in order. Sometimes the minor cost of a gasket will save the major headaches incurred later. ;) Share this post Link to post Share on other sites
hummod 0 #7 Posted December 19, 2011 I will take a look in a few days and keep you posted. Are gaskets available or will I need to make my own? Thanks Larry Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #8 Posted December 19, 2011 The crankcase cover gasket part number is 30684 and it's definitely still available. Share this post Link to post Share on other sites
hummod 0 #9 Posted December 21, 2011 Governor flyweights were frozen. Clean and re-use or should I look for new. Larry, Sayre, PA Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #10 Posted December 21, 2011 If you don't intend on working the tractor on a regular basis, I think you could get away with freeing the weights up and reassembling. If you want new, 30591 is still a good number & lists for around $10 :handgestures-thumbup: Share this post Link to post Share on other sites
sscotsman 186 #11 Posted December 21, 2011 I have manuals! they go with my Ariens webpage..(Ariens used pre-Tecumseh Lausons on early 60's snowblowers) I have two manuals: Lauson_H45D-HB45D-H55D-HB55D_IPL.pdf 5-page Lauson parts list, with diagrams, for engines H45D, HB45D, H55D, HB55D dated October 1960. Lauson-H45D-parts-diagram.pdf 10 page parts diagram for engines H45D, HB45D, HR45D, H55D, HB55D, HR55D. "Issued September 1961, revised March 1962" I see Larry is asking about the H55B, which is not specifically listed in those two manuals.. (im sure its quite close to the H55D though..not sure what the exact difference is between a B and a D) but still, if they might be helpful, I will gladly share them.. I cant upload and post them, because they are .pdf's and none of my web hosting will allow pdf uploads.. but send me an email, and I will email them to anyone who wants them: sscotsman at yahoo dot com Scot (born in Sayre Pa! ;) Share this post Link to post Share on other sites
hummod 0 #12 Posted December 25, 2011 New governor gear and cover gasket installed. It seems to work but engine speed is still unstable. I pulled off fuel line and saw no fuel flowing. I re-routed fuel line lower and it made a big difference. BUT, the carb started dumping gas all over the floor. Probably has float problems. I do know that when I cleaned the carb that the inlet seat could be in better condition. I put it back together and hoped for the best. I do know that parts for tillotson e series updraft carbs are no longer available. Anyone have any suggestions as to my next step? Is there an Inlet needle seat that is close enough to work? I am about ready to give up on the h55 and see if the engine out of my 656 fits. Larry Share this post Link to post Share on other sites
wallfish 18,172 #13 Posted December 26, 2011 If you can't fix it or find parts, you could try a tecumseh carb from an H60. If this is an option you could try using the one from your 656 to make sure the H55 is good and to give you an idea if you want to buy one for it or not. just $0.02 worth Share this post Link to post Share on other sites
hummod 0 #14 Posted December 26, 2011 Well I got lucky, I did a google search for the part number of the inlet seat and needle that I need and got a hit from an ebay store dealing with obsolite parts. It should be here next week. Larry Sayre, PA Share this post Link to post Share on other sites
