Have ke175 kawasaki has spark very week sometimes no spark replaced cdi unit still no spark

sounds like plug to me i would replace no very costly if it continues doing the same thing your coil or if equipped your cdi box my be bad

check the plug first and then the spark in the plugs if it is not ok then replace the cd unit with a new one or else fit the cd unit to another same starting vehicle to know if it is faulty.

Make sure you are getting a solid spark to the plugs - Take out the plugs and leave them sitting on the head, turn over the engine and see if you are getting a strong blue spark. If not, I'd say your CDI unit needs replacing (Capisator Discharge Ignision)

If you have spark its probably not the CDI, check the valve clearances, and compression

Make sure you have a good ground on the coil and all wires are good. If all is good maybe a problem with the stator

check your spark plugs leads
the CDI unit need to be tested for power and make sure that no wires are touching the frame as this could stop your ignition .
the cut off switch could be faulty too .
check all power sources around your motor as a wire could easely burned and earth itself .

Probably a gas delivery problem to the carbs. Check the lines and check for a filter in the line or at the carbs. Something is stopped up and it can't get enough gas to go any rpms.

hi mate replace wires/cables and put another spark plug in it could be spark plug fouling and try the cdi in another kx80 also replace hd lead from coil to sparky

hi mate disconnect the cut out switch and try kicking it over if still no spark check connections are pushed together propally there buggers sometimes and push the plug to the cdi in also consider replacing spark plug and try the coil on a different bike and see if it works goood luck

You said the motor cut out and popped and backfired when it quit, this is almost always one of two things; either the low speed pulse coil or the actual CDI "black" box. You will almost never lose a main coil. One thing I would also check to make sure did not happen is shearing a flywheel mag key. When the motor backfires you can easily shear a mag key if you have a heavy flywheel, (external). However when this happens you don't usually lose spark but it will certainly cause the backfire.
One other item of importance is that the bike you are in question about does not emit a bright spark when you are checking for fire. Make sure you are using a brand new plug and ground it on the head. Try to make sure you are in a dark environment when you check the spark.