what plug is everyone using in their r heads. we have a 150 and 165
spark plug for R head
MX81
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I believe they use stock plugs... cr6hs I think. One step cooler wouldnt hurt (cr7hs)
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1,824 Posts
cr8hsa is what we run on anything bigger than stock.
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what is the point of running a cooler spark. I've never had anyone explain that.
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50rider340 said:
most people dont know why, they think it makes the motor run cooler! But it doesnt!!!!! It all has to do with heat dissipation from the core (the white ceramic part around the electrode) to the plug case (the metal threads). The lower the number, the deeper the core goes into the casing before connecting with it (hints less heat dissipation). the higher the number the more the core is in contact. The difference between a 6 a 7 and an 8 isnt (usually) noticeable by eye.
A cooler plug makes for less of a chance for pre-ignition (yes, not detonation)!
actually, just found a great write up on NGK's site...
Tech Info - Spark Plugs Overview
For the people who think cooler is better... go get you a surface gap plug!
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MX81 said:
will it hurt anything?? 99% sure it wont, but we have no clue what the exact specs are on the bike...
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6,092 Posts
I have a 6 in my 172+R
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1,925 Posts
i run a 6 in my 150 R
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1,488 Posts
[quote name='xr1million']most people dont know why, they think it makes the motor run cooler! But it doesnt!!!!! It all has to do with heat dissipation from the core (the white ceramic part around the electrode) to the plug case (the metal threads). The lower the number, the deeper the core goes into the casing before connecting with it (hints less heat dissipation). the higher the number the more the core is in contact. The difference between a 6 a 7 and an 8 isnt (usually) noticeable by eye.
A cooler plug makes for less of a chance for pre-ignition (yes, not detonation)!
actually, just found a great write up on NGK's site...
Tech Info - Spark Plugs Overview
100% TRUE. IVE ALWAYS RAN A 8 WITH A BBK ON MY 50 & 110
A cooler plug makes for less of a chance for pre-ignition (yes, not detonation)!
actually, just found a great write up on NGK's site...
Tech Info - Spark Plugs Overview
100% TRUE. IVE ALWAYS RAN A 8 WITH A BBK ON MY 50 & 110
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