I've had mine mounted up front.
Now my cdi is just zip tied to the frame next to the coil. I'm going to permanently mount it there this winter when I tear it down.
It can be done without the special tools guns, you just have to be careful. I only used the special tools when I worked at the dealership. I've done numerous since I left the dealership 10 years ago.
You either have a bad spark plug that is fouled or a leaking crank seal? Check the oil and see if you have any in the clutch cover. I'm guessing it's just a fouled plug
No he needs a crank install tool for a Blaster not a flywheel puller.
He needs both of these.
http://www.rockymountainatvmc.com/p/43/-/171/989/-/17166/Tusk-Crank-Puller-Installer-Tool/CRANK+PULLER
http://www.rockymountainatvmc.com/p/43/-/171/989/-/17167/Tusk-Crankcase-Splitter-Separator
I'd toss the boost bottle. Get some porting, different pipes, bigger carbs, and so on so you can pull a taller gear if you really want to beat your buddies. I'm not sure what kinda parts you can get your hands on my your side of the pond.
15/41 is a 2.73 gear ratio, 15/42 is a 2.80 gear ratio and 14/41 is 2.92. Your current set up will give you the most top speed out of the three. If you want more top speed and have enough power to pull it go to a 16 front or down on the rear.
Make sure your timing is at +4, I've ran my trail bike at +4 for years with no problem like a bunch of others here.
How long of a track are you running on?
Are you are max speed before you get to the traps?