hi
im having the same trouble with my DT125R 1998,
i got a DEP tail pipe and just took the washer out the front pipe,
iv took the snorkel off the air box,
iv put a smaller sproket on the back,
but still its still slow on the top end,
it does 70MPH at a push it just seem to struggle in 6th,
any other ideas what i could do to make it faster, like jettin it up (got no idea what main jet it has in)
or boost bottle or something.
Thanks alot
Spammy