Questionhi John,
I did get a compression gage and the gage reads about 148 psi on both sides. The mower seems a bit better now - with both sides "powering" the mower and no recent exhaust back fire. Would a compression gage check like I did verify that I do not have a burnt valve or that it is sticking (assuming it always does it). Would this get worse as it gets hotter?
Also, if I remove the head - will I need to get a new gasket?
Thanks for your input.
Ron
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Followup To
Question -
Hi John,
I have a Huskee riding mower, with 21 HP B&S Intek motor, Model 407777, type 0124B5, code 010521YH. It backfires through the exhaust. Chnaged spark plugs, right side (V away from you) looks like not firing, left side fine. If I pull wire from right side, almost no difference, if pull left side, engine dies.
Looks like right side gets plenty of spark. Although I do not have compression gage, looks like it gets good compression. I think this is an electrical problem. someone told me could be a diode blown own, and getting cross spark. I am somewhat mech inclined, but do not have small engine specialized tools.
What are your suggestions? I need the mower up and running!
Thanks
Answer -
Hello Ron:
From the Breakdown of this Engine I see it has the Double Coil Spark System. With this System there can be No Cross Over in the Spark. Remove the Valve Cover an Inspect the Exhaust Valve Lash(air gap between the Rocker Arm and the Valve Guide. If this is Correct, then the Valve May be Burnt/Sticking and Causing the Backfire. Rotate the Engine by Hand and Watch the Valve. Is it Sticking? Set the Valve Lash at .017in. This is a Little Wider Gap than the Specifications, but I get Better Results with it than the .014in the Specifications call for. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. I enjoy knowing the Outcome. Thanks.
Good Luck
Respectfully
John
Answer Hello Ron:
If the Problem has Cleared Up. 1- It Could have Been Carbon on the Valve Seat Preventing the Valve from Closing Properly. 2- The Valve May have Been Sticking. Carbon Lodged Between the Stem and the Guide. There is a Chance it May Happen Again. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.
Good Luck
Respectfully
John
