Yamaha TTR 225 no power under load

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If it's like my '07, it has a vacuum operated, diaphragm slide throttle. Check that the diaphragm is intact and drill out the hole that sends the vacuum signal up top.
Also be sure to gut the muffler out as suggested. Then get your jets sorted out. The pilot jet screw is EPA non adjustable similar to a chainsaw's jets. You have to drill off the jet access cover to expose the slotted screw and then adjust the screw out to richen it up. Stock is 1 1/4 out, set it at 2.5 -3 turns out. Makes all the difference in the world.
BB
 
Where is this jet access cover?
If it's like my '07, it has a vacuum operated, diaphragm slide throttle. Check that the diaphragm is intact and drill out the hole that sends the vacuum signal up top.
Also be sure to gut the muffler out as suggested. Then get your jets sorted out. The pilot jet screw is EPA non adjustable similar to a chainsaw's jets. You have to drill off the jet access cover to expose the slotted screw and then adjust the screw out to richen it up. Stock is 1 1/4 out, set it at 2.5 -3 turns out. Makes all the difference in the world.
BB
 
As said before check for any in line filters or screens. DI box may be going out or the stater is going out. If the stater is not putting out enough currant it will bog at high RPM's
 

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