This is a 14 hp single cylinder motor. It is backfiring through both the carb and exhaust. I think i have checked all obvious things, checked and replaced fuel. Checked flywheel key, checked valves and cam timing good. still cant figure out why it wont start. I shut off fuel to carb and atempted to start w/ just starting fluid but same thing happens, engine cranks a bunch before backfire through carb or exhaust. also spark is good, I feel this is a timing issue as engine does not run fine on just starting fluid..

any help is appreciated!!!

Same problem here with the FC420V backfiring through both the carb and exhaust. replaced carb gaskets and o-rings, and ignition module, no luck.

thanks for any ideas,

j.

Same problem here with the FC420V backfiring through both the carb and exhaust. replaced carb gaskets and o-rings, and ignition module, no luck.

thanks for any ideas,

j.

could be carb is clogged or machine isn't getting fuel the way it should which means a clog in carb/gas line/gas filter if equiped. clean throughly and see what happens, jets included

Same problem here with the FC420V backfiring through both the carb and exhaust. replaced carb gaskets and o-rings, and ignition module, no luck.

thanks for any ideas,

j.

What is the spec number from your engine?

Have you checked the compression or done a leak down test?

Check the valve lash, valves that are adjusted too tight can cause this type of issue.