My blaster is running with a NGK BPR6HS spark plug. And as i can see all over the net and in the manual, it should be a B8ES. Is it possible that some blasters are running with HS and some with ES? Because H stands for short and E stands for long.
The only mod i´ve done is bored out the cylinder. I figured out that the spark plug is too hot so wanna change it, but when i google the b8es it looks like the tread is to long when i compared it to the one i have. H=12.7mm E=19mm