original resistor is 100 ohms, but doesn't lower voltage enough for some ignitors. Some people have had to use as high as 150 ohms for bike to start.
Same size valves, there are
many variables that determine power-output. There's no
single component that contributes to entire change.
COMPRESSION
08-12: 11.6:1 pistons
88-07: 12.4:1 pistons
For race-bike, use 13.5:1 pistons with race-petrol +105 RON
EXHAUST
08-12 new-gen models have exhaust header-pipe at least 5mm smaller than pre-gen models. Additonally 2-1 designs optimises mid-range torque and loses high-end flow & power compared to earlier 2-2 exhaust.
Tyga full exhaust has larger diameter header pipe with true 2-1 merge collector along with smoothest transitions to muffler. Tyga full-exhaust gives +22% +6 bhp, better than any other single upgrade! See my exhaust comparison here:
https://www.ninjette.org/forums/showthread.php?t=338180
IGNITION
08-12: maximum 35-degrees BTDC @ 4000rpm
95-07: maximum 38-degrees BTDC @ 4500rpm
88-94: maximum 42-degrees BTDC @ 4500rpm
CAMS
08-12: int/exh = duration 225/223 deg, lobe-centre = 102.5/107.5
95-07: int/exh = duration 272 deg, lobe-centre = 110
88-94: int/exh = duration 280 deg, lobe-centre = 110
No, you cannot put earlier pre-gen cams on your new-gen. They are designed for rocker-arms instead of bucket-over-valves. Only aftermarket cams worth using are Beet cams from Japan.
CARBS
08-12: 28mm
88-07: 30mm
86-87: 32mm
There's no secret to making power with these engines. Extremely competent engine-builder & racer have gotten 48whp out of one (close to
factory ouput!). You just have to know exact specs by taking apart engines and measuring them. Then knowing which ones to change and by how much.