top end stummble???

rad-blaster230

New Member
Jan 27, 2008
90
0
0
fond du lac, WI
ok, here is the deal

my blaster runs awsome up until 4th/5th gear right before it hits the top of the rpms

but once it gets to that rpm range it stumbles like it is not geting gas or something

and the spark plug is the perfect color (light brown)

help plz!!!!