Re: How to access middle spark plug
The NGK UR5 (stk #712) which is an obsolete standard nickel alloy spark plug. It was replaced by NGK 2771, also a standard nickel alloy spark plug.
You are probably referring to the NGK UR5 IX (stk #7177), iridium tip, 0.6 mm fine wire, pre- gapped at .040".
In comparison, the Denso ITF20 (stk #4973), 90% iridium, 0.4 mm fine wire, pre-gapped at .060".
So what's the difference between those and the oft-reccomended UR5s?
-P
The NGK UR5 (stk #712) which is an obsolete standard nickel alloy spark plug. It was replaced by NGK 2771, also a standard nickel alloy spark plug.
You are probably referring to the NGK UR5 IX (stk #7177), iridium tip, 0.6 mm fine wire, pre- gapped at .040".
In comparison, the Denso ITF20 (stk #4973), 90% iridium, 0.4 mm fine wire, pre-gapped at .060".