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Help! Where do I start?

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My 2012 wr450 with only 1200km started running funny tonight, soft on power in the top end. Stopped riding cleaned the filter, set the chain and fueled up. Went for a rip, some torque seems gone , it's cracking and popping (rich)and the top end is 10 km lower, feels soft. Then it stalled twice low speed in first gear? Valves?

Edited by Greyforsyth

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If you are not filtering your gas and treating it with gas treatment, you have clogged the fuel pump filter and probably corroded the injector nozzle.

You need to pull the injector and pressure clean it, pull the fuel pump and replace/clean the filter.

The other issues is the coil on the plug cap. If they get corrosion from water, they start arcing.

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