Whats under the engine case, what goes in each container?

Yes, you may have the wrong coils going into it. Otherwise unless they are somehow overheating or getting too much vibration or too high a primary voltage I have no idea. It would be great if you would post a final definitvie answer if and when you get one.

sounds like your throttle cable might be frayed or broken, when you pull the throttle and let go does it go back on its own? and can you here a clicking sound when you close the throttle? If you could send me pictures of the carb how every thing goes in and take it apart and take pictures, that would be helpful.

This is best done on a lift with supporting tranny jack for the engine to raise and lower as the case might be

If you can locate the helmet lock on the left hand side of the bike and open it. There is a lever behind it just pull it down and you should hear it pop. When it does you can lift the rear of the saddle a little then pull backwards.

i know that the mc18 has the pgm2 under the seat(pillion)and it is simply a plug in plug out unit,and i am fairly sure the mc16 is the same..hope this helps

place the ignition key in the helmet lock keyhole (rear left hand side of the seat) turn half a turn so that the helmet lock slides down (now you know where to leave your helmet when you have to leave it with the bike). BEHIND that hook (closest to the wheel side) is another one. That will now push down on a sprung return. The seat should pop up but if it's a bit snug then whilst pushing down on the catch (to keep it released) gently pull up the rear of the seat. Now the lock is disengaged slide it backwards 2 cms and all the other retainers will slide out. Hey presto seat and bike have now parted company. Good luck putting it back on it's harder to get all the slidy bits to re-engage (particularly the two in the middle that have to slide onto two "pegs").

alright it is under the fuel tank.
steps
1) take off seat
2) remove bold to lift up fuel tank (found near handle bars )
3) you will then see oil tank there
4) remember use good quality 2stroke oil

Take your side fairing off. Undo the left hand engine casing, take off chain guard. Under this there will be a gasket and two 12mm bolts holding the motor in place. Undo these and take the motor off...