The problem is probably in the head and is probably 1 or more valveguides. This requires a valve job. Symptom blue smoke. To prolong repair try using Kendall 15-40or 20-50 it doesnt burn so easily and use an injection system cleaner it will remove some of the deposit buildup.
There's something getting in the cylinder that's not supposed to be there. Are all plugs fouling similarly? Likely an improper fuel mix (broken MAP sensor, O2 sensor, etc), or a leak in the intake system. Is it just one or two? Probably a cracked head gasket or worn piston rings on those cylinders. There's lots of photo tips on spark plug fouling on the web - the various colors and residues lead to clues as to what's causing it. Need to fix the cause, just changing the plugs won't work.
If you're fouling plugs your jetting is wrong. The mixture is too rich to allow the plug to reach and sustain the minimum temperature required to allow it to be 'self cleaning'. Your suffering from reliability problems as well as a loss in performance due to incorrect jetting. Fix the carb. Hope This Helps.
start with new plugs
It's called a misfire... or random multiple misfire. It can be cause by a number of things. check your spark plugs for fouling, your spark wires for breaks or cracks in the rubber, your distributor, or your fuel injectors... it could be a tricky prob. or it could be easy as pie to fix...
How do u fix a stripped out oil pan
Try replacing the plugs and wires
it was how to fix a sports car in 1967
no. a hammer is a good way to fix it
Don't fix them, replace them. Its an easy job, see related link.
If the oil mix is too high well--really, it's the air/fuel mix. It is too rich (not enough air). Some things to try: clean air filter, make sure the little orifices in the carb are clean, check the float level, air (or fuel) screw adjustment, wrong plug, one or more jets too rich. You will need to do some research on this one if you want to permanently fix it. But if you work through it, you can make it stop fouling plugs. When I first got my cr125, I fouled plugs after every 20 minutes of riding. After working through the possibilities, I found that the float level was wrong and the main jet was wrong. Now its been 2 years on the same plug.
To fix backfire on a 1968 Volkswagen Beetle, start by checking the ignition timing; it should be set to the manufacturer's specifications. Next, inspect the spark plugs for wear or fouling and replace them if necessary. Ensure the fuel mixture is correct, as an overly rich mixture can cause backfiring; adjusting the carburetor may be needed. Finally, check for any vacuum leaks in hoses or intake manifolds, as these can also contribute to backfire issues.
250 trillion dollars