QuestionHello, I have a 20 " Toro Snowmaster from 1978 that doesnt want to keep running. I cleaned the exhaust ports, rebuilt the carb, and it runs for about 15 seconds and quits. The plug is old and been wet a couple times, but always ran fine before. The gas is about 5 weeks old. It also leaks gas constant slow dripping (off and on event) from somewhere coming out of the carb. The gas hose broke, and I replaced it with another, but it's slightly smaller in diameter and barely long enough. But the gas flows well out of the gas tank to the carb. This has me frustrated because I dont know if once it runs, it is not getting gas, or too much. When it was ready to stall, I pulled out the choke and it got worse. It takes like 30 pulls with the choke off completely, then it smokes for about 5 seconds, cleans up runs fine for another 15 seconds, then quits. Almost like once the gas it out of the carb, it stalls? Could that hose I put on be the cause of it not siphoning right and it starves for gas? If I can pinpoint why it drips gas while it sits in storage, I might be able to fix one problem anyway. Thanks.
AnswerHello Matt:
>>From your Description it Sounds like the Carburetor Float Needle Valve is Not Seating Correctly (causing the engien to Flood) and May Require Replacing and Possibly the Carburetor Mixture Screws May Require Adjusting.
>>The Following is the Instruction File for Setting the Air Mixture Screws. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw). Now Setting the Air Mixture Screws: ****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine. Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to MAx and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starvewd for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required. Now Set the Idle Air (L) Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
>>Send me the Model Numbers Off the Unit, Please. With these I can Locate the Proper Manual and Better Assist you.
>>You can View a Breakdown/IPL of the Mower at this Site Addy, https://lookup3.toro.com/partdex/default.cfm and Select Start Parts Viewer. Now Enter the Model Numbers (XXXXX) and Click Search. Now Select View Assembly Drawings for your Year Model.
>>**If you Need Assistance in Locating the Model Numbers, then You can Go to this Site Addy; https://lookup3.toro.com/partdex/default.cfm and Select Step 1.**
>>Thanks.
Respectfully
John
>>PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
