backfires

Hello, I have been working on a predator 9500 inverter generator for a family friend. He requested a full service along with a few small repairs. Customer was telling me that generator has been neglected, and oil hadn't been changed in a long time. The customer runs a concession business and...

I was given a TroyBilt Tuffy rear tine tiller, that, after fresh gas, started right up. Kind of runs ok but it backfires out the muffler. The tiller model number is 12060 while the S/N is 120600250536. The engine is H30 35387V Any help will be greatly appreciated. Thanks in advance, Alan

Kohler CV15S engine on my old Sears riding mower. Was running fine, then suddenly I noticed it was running really fast and power was missing. Shut it off and it backfired before re-starting, still was running full out. I checked the timing because of the backfire but the shear key is fine...

Had my Stihl FS 38 in storage for two years. No gas in tank but some in primer bowl. Added gas and no start up. Thought carb was the issue. Replace carb with OEM Zamba. Tried to start and it began to back fire ( exhaust port and intake port) . Checked coil and tested good. Installed new Stihil...