I changed coil and cdi box and still no fire on Pegasus 150. what can be the most likely problem?

SOURCE: no spark 110cc engine wont start

Check the fuses. Next, check for spark but with a new spark plug. How good is the battery? If needed, add water to the battery cells enough to cover the top of the cell plates.Try a jump start from your car battery. Is the kill switch on? Check the operation of the ignition switch with a volt ohmmeter. You should be getting power into and out of the ignition switch.

If the bike doesn't start and run properly check the side stand kill switch. It kills the engine so that you don’t start out with the side stand down. Broken or out of adjustment, it would kill the spark. Check for a broken wire at the switch or coupler. Get a service manual and check out the electrical section. Some bikes have a diode integrated into the turn signal relay. Try moving the kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it. If that doesn’t work, check out the relay.

Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing.

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SOURCE: the engine is firing on one cylinder and when the

Clean the carb on the bad cylinder. It may have a plugged pilot jet. The bike has CV carbs. There is a chance that the offending carb may have a pin hole in the diaphragm causing one slide to open later than the other slide. This could also be the problem. With the air cleaner removed, look at both carb slides and see if they crack open at the same instant or if one is definitely later than the other. That will confirm or eliminate the diaphragm.

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SOURCE: 85 yamaha virago xv1000 are the coils & cdi igntor box interchang

YES

SOURCE: I have squeaky disc brakes on my qlink pegasus 150

Unlikely. Squeaking is usually caused by dirt - go out and give it a good thrash, including some really hard braking...

SOURCE: bike wont fire. has no spark

I don't know what motor wires go to which???