is your spark plug suitable for your cag engine?

[RD RACING]

first of all, you should replace your original spark plug with something that will last how a spark plug should. i have seen so many of these chineese plugs go bad after only 10 minutes of use, no good. i recommend the old faithfull ngk-bm7a for the offset cag head. i have removed spark plugs from various cag engines and noticed the length of the plugs [ way to long] for correct combustion the electrode end of the plug must be centered in the middle of the barrells dome, not to the side.
some people say, put a longer plug in and you will get more compression, true in a way but the fireing of the dommed piston is not to the center,no good for proper combustion. on the cag cylinder there are 7 threads where the spark plug screws into, the ngk-bm7a has equilevent thread, allways remember when buying a new plug to try, don,t go above 10 threads on the spark plug. this has been proven on tests using plugs up to 16 threads. [bang stop] the stock spark plug [ chineese] which came with your chineese p/bike costs them 15cents. that shows quality do you think? replace for your mental and physical satisfaction.

[pocket bikes]

i got a new spark plug yesterday after have the stock 1 in there in for 3 months. im running the bike on 45:1 full synthetic oil with 95 octane but the spark plug keeps going black. I think im running it to rich but can i go to 50:1

[wizzar]

You say you plug keeps going Black. Dry black or wet black?

Reading a Spark Plug
http://www.densoiridium.com/howtoreadusedplugs.php

[pocket bikes]

dry black

[Hoover]

is the ngk-bm7a one of the iridium series ones???????

[wizzar]

Dry black plug indicates Carbon Fouling

http://www.densoiridium.com/howtoreadusedplugs.php
--------------------------------------------------------------------------------
Dry, soft black carbon on the insulator and electrodes.

Symptoms:
Poor starting
Misfiring
Faulty acceleration

Causes:
Faulty choke - over rich air/fuel mixture
Delayed ignition timing
Bad ignition leads
Plug heat range too cold

Does this sound like your spark plug?
Fuel mixture is OK at 45:1
Is your bike a/c or w/c?

[pocket bikes]

air cooled but mine doesnt have any of the symptoms:

[wizzar]

You may to check some of the items listed in above post, as I don't think it is a fuel mixture problem otherwise your plug would be black and wet, 45:1 is a reasonable lean fuel mixture.

[pocket bikes]

how do i check these things

[wizzar]

one by one