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…also, if that turns out to be the problem, I highly recommend an oil change! More likely than not, you trying to crank it has pushed some gas past the piston rings and into the oil.

I was driving myself nuts trying to track down this issue. Tried new battery, valve clearance, starter solenoid and everything else. It ended up being a leaky needle valve seat in the carb. It caused the engine to aqua lock when it sat for a while. Take the plugs out. If gas comes pouring out...

Nope. The key looks fine to me (see photo). The only other thing I could think of is that there's some leak around the intake valve I can't see. I guess I could go get a compression tester to see how I'm doing. Full disclosure: A couple of years ago, it overheated (mice had built nests in...

Hi! I have a 17.5 hp B&S model number 31C707 that won't start. It turns over fine and I have nice spark at the plug. After cranking for a while, there's a loud backfire through the carb (loud enough that the neighbors mistook it for a gunshot). Here's what I've done so far: 1) Checked the...