(Honda XR-250 R)

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Remove the hose from the top of the airbox

Position the de-compression lever so that it is above the bars

Purchase an aftermarket front brake hose

Remove the baffle and replace with a performance baffle

Have the gearing set to 13/48

Check the jetting on the bike

Adjust the mixture screw (altitude can affect this, adjust until your bike is running smoothly)

 

Whilst I think these tips are correct, I take no responsibility for their implementation