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.024 ~ .028 is the average gap for most 2 strokes...
.028 ~ .031 is the 4 strokes
I wouldn't use a Bosch plug in anything that doesn't come with them. If it's a Stihl then sorry
Dear god. none of you sound like you know what your doing. The Bosch HR 78 NX spark plug is a super 4 plug that has 4 outer ground electrodes and uses surface air gap technology.
There is no need to mess about gapping the plugs as they are Factory pre-gapped electrodes.
Higher ignition reliability thanks to eight possible ignition gaps
Self-cleaning thanks to surface air-gap technology
Increased thermal range: up to three times as many cold starts possible as with conventional spark plugs
So don't mess about gapping your super 4 Bosch, Just fit them.
if you have over 200 hours on this FS 80 then you may need a valve adjustment(yes this 2-stroke has valves).
if you wanna try to do it yourself it should be set @ 0.1mm @TopDeadCenter. my advice is take it to any stihl dealer and let them do it. its scheduled maintenance
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