Motorcycle Repair: some questions, digital cdi, 150cc bike

Question
hi

what is "ignition curve"  , how is it obtained?

what does it show of engine.

what is digital CDI . Does ignition curve has anything to do with CDI. Can it be changed for better porformance

I have a 150cc bike.It used to pull quite well untill the odometer showed 10,000. Now it is 19000.It pulls with a lot of dificullty.the engine revs like it is on a great friction.The revs do not shoot up as it used to in the beginning. My gut feeling is that it is losing compression. How to restore it without any reboring jobs.

bye


Answer
Ignition curve is the relationship of the firing of the ignition in relation to the RPM of the motor. As the motor reves the timing is usually advanced or you will get pinging.
As to your other questions, I only work on harleys. Check with some of  the other experts and they should be able to help you.
Good luck and happy riding
Mike