I'm not saying the clutch is useless. There are situations where you have to use the clutch, I'm just saying that you don't have to use it
every time you shift. You still need the clutch to take off and when your not in the right rpm range to shift to the gear you want to be in. The clutch is also very useful when your riding technical terrain where you can slip it to build rpms rapidly.
Some very basic rules I use for shifting without the clutch:
1.When shifting without the clutch DON'T force it! It should go in easily if your in the right RPM range for that gear. Forcing it will only cause bent shift forks or similar damage. If it does not shift easy use the clutch!!!
2. When down shifting DON'T do it from top speed WOT. So if your wound tight in 4th don't shift to 3rd to slow down. That's what the brakes are for. (don't forget you have two brakes use them wisely)
3. DON'T "rapid shift" without the clutch. As in shifting more than one gear as fast as you can because there is no way your in the right RPM range that quickly. like when your riding down a trail in 5th and you come up to a steep hill that you want to use 2nd for use the clutch
4. When you downshift, think about your RPMS are going to be When you drop to that next gear. What is your motor going to sound like, Is it going to over rev the motor? If so, use your clutch to ease into it, Dont just slam it in
5.No neutral drops!!! Like I said you need it to take off.
6. RANGE RANGE RANGE!!!! Watch the range, if your not in the right RPM range DON'T DO IT!
Lastly use common sense. Its a good Idea to get some practice in a open field or if you can a road where you can focus on your range and shifting without distractions like jumps and those trees that like to jump out in front of you. Most of you probably do it without knowing. Pay attention to your clutch lever when you shift. You probably dont pull it in all the way every time so in effect the clutch is still transferring torque to the gear box just not at the same amount or RPMS.
As far as this Ignition interrupter thing. I am not familiar with it, could someone post up some links to some info explaining this in detail? everything I have found leads to a device that completely kills an engine in an emergency.
straight cut gears in action!!! turn your volume up and you will understand why passenger cars use helical gears