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The engine will require running in as the bore must have been scorred as well and should have been scoured with wire wool to allow the rings to bed in. Is the tapping coming from what you have replaced? Find a long screwdriver and put the tip on the top of the engine and the handle up against your ear and listen. Locate the source of the knocking/tapping and then you will know the cause and area. Hope that helps.
hi, sounds like the oil seal in the rocker cover has failed, remove the rocker cover and you will see a rubber seal, this seals the oil inside the cover, however when the seal fails around the spark plug hole, oil leaks into spark plug well and out of weep hole.
It could be the speed of one carburetor is faster than the other. This causes the backfiring as well as forces one cylinder to run lean which causes the tapping noise. You will experience an identical tapping or "ping" when you get close to empty on main fuel and need to switch to reserve. Most likely you or the previous owner unknowingly adjusted the speed of the rear carburetor down because of the high stock idle not realizing the front carburetor needs to be slowed down to match. While running simply turn the idle adjust screw clockwise on the rear carburetor until the idle smooths out and the backfiring/tapping stops.
You can do that but getting the correct heat range plug might be trouble. The better soluition is to use a Heli-Coil thread repair kit, this will restore the threads to the factory size. A kit comes with a special tap, several heli-coil inserts and the installation tool. Follow the instructions and you will be fine, one tip that I do not know if it is in the instructions or not, pack the flutes on the tap with heavy grease, this will catch and hold the cuttings keeping them from falling down in the cylinder. Also make sure the piston is at the bottom of the stroke when tapping the hole, this will keep the tap from running in to it.
i would definatley check for vacuum leaks . Then check the diaphrams in the carbs. Also check to make sure that the float in the carb. It sounds to me like for some reason that cylinder or side of the engine is getting to much fuel and fouling out the plug. Loss of compression would have to be pretty substianal to cause that kind of problem .
The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.