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Discussion Starter · #1 ·
I have a 25hp Intek on my riding mower with 130 hours on it.

I'm getting backfiring through the exhaust on one cylinder.

Fuel pump is good, compression on both cylinders is 145psi, spark plugs have been changed out, diodes check good to the magnetos AND magnetos have been switched from side to side...all to no avail. I even checked the valve clearance (0.005").

Backfiring ceases when the choke is pulled out or the weak cylinder's spark plug is disconnected. I'm thinking that one of the two barrels of the carburetor has some junk in it and causing the one cylinder to run extremely lean. Any ideas out there? Thanks!
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