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The gap spec on the plugs for the 912 series engine is in the Line Maint. manual. Section 13.2.2. Gapping out to .035 will give a poor spark, may lead to an incomplete combustion, hard starts, poor fuel economy and inaccurate mag drop numbers.
The plugs can be removed using a standard 16mm spark plug socket. The standard gap is 0.6 - 0.7mm with a wear limit of 0.9mm. You need to apply the correct thermal transfer compound to the threads and then torque to 20Nm (177in.lb).
3.2.1) Inspection of spark plug gap measurement Due to the curved gap between the center electrod e and the ground electrodes, it is suggested to use a wire type feeler gauge for accurate gap measurement.
Because of the differing thermal load, particular spark plugs have been specified for each engine type. Page 162: Inspection Of Spark Plugs BRP-Powertrain MAINTENANCE MANUAL 14.2.2) Inspection of spark plugs Check heat range and adjust electrode gap correspondingly. Heat range Inspect all spark plugs for mechanical damage.
The Spark-Plug Gap. One of the key factors that make a spark plug work well, or not, is the size of the gap between the electrodes. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.
Quick and simple video on how to replace the spark plugs on a Rotax 912 ULS. For this model, you will need:x8 DCPR8E Spark Plugsx1 Thread Lubricant/Thermal ...
Re: spark plug gap 80 HP Rotax 912. I have a Zipper big bore on my 912UL. So it is a little different than stock. I am using DCPR8E plugs. On Hal Stockman's advise, I gap at .022-.024". So, on the tight end or a little less than OEM spec. It has aided in cold starts and general idle quality.
