Engine problems



hello i have a 2000 blaster and not having the best of luck. Heres my problem i put new gear oil in it and took it for a ride but i could putt around slowly but when i got into the higher rpm's and higher gears it would smoke blue smoke badd and spit and sputter..... please help
we need more info.

1. how did it run before you put in oil? (Im assuming the same) new oil will not make it do this.

2. when you say higher rpm's what gear? all gears at like 1/2 throttle or through out complete throttle throw.

3. how long have you had the blaster? what mods if any.

these are questions just to get us started. Another thing you might want to do is search around the forums a bit and read up on others problems/solutions.