Questioni have a sears craftsman snowblower model c459-52130, my problem is that it's worked fine this year for about 5 times and now with full throttle you can hear it backfire and the exhaust got red hot and i could see in the exhaust it was burning red, like charchoal.also sparks were flying out of the exhaust. i had this blower serviced 2 years ago with a new carb,exhaust belts and flywheel. could it be time to hand it in?
AnswerI believe the link below is your snowblower.
http://search.cartserver.com/search/search.cgi?cartid=a-8671&category=MTDPDF&max...
You snowblower is running really lean, not enough fuel, valves out of adjustment, possible leaking head gasket or a sheared flywheel key. The head gasket and key are not likely but possible so I would start with the carb.
This link describes how to adjust the carb, and if necessary, how to rebuild the carb as well as how to check/adjust the valves.
http://www.cpdonline.com/692509.pdf
Browse through the egnine service manual for the carb adjustment and valve check procedure.
Let me know if this helps.
Eric
