Smoking

[Blazin400]

Well yesterday i was riding hard for bout 2 hours and i noticed toward the end of the ride that my 400 was smoking... it was blueish smoke but only when i hit the throtle 1/2 to 3/4... i no it might be seals... so what should i do??? thanks

[TRXRacer1]

If it's doing after you've been riding it's most likely time for another bore. Seals are most evident at start up. Get the cylinder mic'd and see where you're at.