Spark plugs

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Tony B

Tony B

Member
Messages
21
Ok fellas here’s a question that I’ve always wondered! What is the difference between a CMR6H and CMR7H sparkplug??? I’m running a 34cc km engine which one is best you think for this engine?
 
I would be careful going to a colder plug on a 2 stroke . You may find you will foul more plugs. I'm no expert so I could be totally wrong, but I found over the years that the manufacturers usually spec the right heat range plug unless you have made major mods to the engine your self. What does the plug that you have in it now look like .
 
1Coopgt said:
I would be careful going to a colder plug on a 2 stroke . You may find you will foul more plugs. I'm no expert so I could be totally wrong, but I found over the years that the manufacturers usually spec the right heat range plug unless you have made major mods to the engine your self. What does the plug that you have in it now look like .
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AMEN!
 
Z.hb71 said:
AMEN!
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The OP's comments make no sense to me . I'm on my third plug already and I haven't even gotten through a gallon of gas yet . After I get though this gallon I plan on going to a 28:1 ratio instead of 25:1 on my 36cc . Unfortunately the color charts for 2 stroke plugs aren't available in the forum any more . But If read the plug like I would a car or my motorcycle its still to rich.
 
1Coopgt said:
The OP's comments make no sense to me . I'm on my third plug already and I haven't even gotten through a gallon of gas yet . After I get though this gallon I plan on going to a 28:1 ratio instead of 25:1 on my 36cc . Unfortunately the color charts for 2 stroke plugs aren't available in the forum any more . But If read the plug like I would a car or my motorcycle its still to rich.
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Just by looking at the plug won't do anything because the color can mean many things like ignition timing and much more, here's how ur properly read a plug.
It's a very common misconception. It's probably fouling plugs cuz it's running rich for break in but I highly doubt it would foul three plugs before just a gallon
 
Z.hb71 said:
Just by looking at the plug won't do anything because the color can mean many things like ignition timing and much more, here's how ur properly read a plug.
It's a very common misconception. It's probably fouling plugs cuz it's running rich for break in but I highly doubt it would foul three plugs before just a gallon
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Awesome video . My buddy showed me the same thing for reading my GSXR plugs. The plugs I've pulled out of the buggy were pretty much black and the last one was wet from flooding it . Although after watching the vid I will need to make a chop run to see what a new plug looks like .
 
1Coopgt said:
I would be careful going to a colder plug on a 2 stroke . You may find you will foul more plugs. I'm no expert so I could be totally wrong, but I found over the years that the manufacturers usually spec the right heat range plug unless you have made major mods to the engine your self. What does the plug that you have in it now look like .
Click to expand...
Plug looks absolutely fine ???
 
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