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Having problems with Yamaha yz 125. Have an aftermarket keihin pj carb and bike cuts out and high rpms and fouls plugs easy. Replaced the main hex jet by a lot of sizes down and still does the same thing. Bike will start (not easy) and bog out and die after 5 mins of riding and won't start up unless you kick it over at least 30 times.  Any idea what the problem could be? Thanks guys.

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Your fuel / float level could simply be set too high.

As the gearbox oil level been dropping lately, if so suspect a worn RH crank seal.

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yeah, bad crank seals lose crank pressure which rob power. the right one lets oil into the fuel mixture and usually makes more smoke come out the pipe.

make sure your air filter is clean. change the spark plug.

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