8ml stroke help

i have a 8ml stroker powervalve motor that i can't get to run right has great bottom end but right after it starts sounding staticy and feels like it's hitting the rev limiter. specs 8ml 81ml piston 185psi stock 44 carbs 135 low 135main 2.3 needle 115g spring tnt blaster pipe.

feels like it could be timming but i had my ebox with msd enhancer and coil in it so i swapped with a stock ebox same problem
not sure if i should try and advance it or retard it or can it be somthing differnt.

o yah and it ran great for 30m first ride on motor and then started this please help
 
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