GrassStripFlyBoy Posted September 30, 2020 Report Share Posted September 30, 2020 I replaced the spark plugs this summer and when searching around the forum then I noticed some posts about gap distance depending on summer / winter temps. How many people are adjusting gap for seasonal change? I'm doing condition inspection first of Oct now, so would be a time I could tighten them up a tick if need be. Thoughts? Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted September 30, 2020 Report Share Posted September 30, 2020 I gap to .024 year round. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted October 1, 2020 Report Share Posted October 1, 2020 8 hours ago, WmInce said: Reason? .024" is the minimum gap, and the gap will always grow with use. This is of course for the old style NGK spark plugs. If you have the new style plugs you are not supposed to gap them, simply measure and replace. They call for replacement at 200 hours, so I suspect that they will never go past their wear limit. https://legacy.rotaxowner.com/si_tb_info/serviceinfo/si-912-027.pdf Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted October 1, 2020 Report Share Posted October 1, 2020 New style Rotax double electrode plugs specs: INSPECTION OF SPARK PLUGS Visual check Inspect all spark plugs for mechanical damage. Electrode gap NOTE Inspect the electrode gap also on new spark plugs before installation. Electrode gap New Wear limit0.8 - 0.9 mm (0.031 - 0.035 in) 1.1 mm (0.043 in This is the one you're asking about. .023 - .027. I pick .025 just because it's in the middle. Don't start at .027 because the gap will only get wider. The plugs right out of the box are .030 and need to be gapped down. NGK DCPR8E plugs: 13.2.2) Inspection of spark plugs Heat range Check heat range and adjust electrode gap correspondingly. Visual check Inspect all spark plugs for mechanical damage. Electrode gap Wear limit0,6 - 0,7 mm (0.023 - 0.027 in) 0,9 mm (0.035 in) Quote Link to comment Share on other sites More sharing options...
GrassStripFlyBoy Posted October 1, 2020 Author Report Share Posted October 1, 2020 Appreciate the scoop on this. I picked up a dandy screw type plug gapper and will dial them into 0.024 - 0.025 range. Quote Link to comment Share on other sites More sharing options...
Mike Koerner Posted October 3, 2020 Report Share Posted October 3, 2020 Hmmm. I usually just bang mine on the floor. If I don't bang them enough, I bang them again. If I bang them too much, I unbend them with a pliers. I usually go through about 4 cycles like this on the first plug... then use the rest right out of the box. Mike Koerner Quote Link to comment Share on other sites More sharing options...
Skunkworks85 Posted October 3, 2020 Report Share Posted October 3, 2020 24 minutes ago, Mike Koerner said: Hmmm. I usually just bang mine on the floor. If I don't bang them enough, I bang them again. If I bang them too much, I unbend them with a pliers. I usually go through about 4 cycles like this on the first plug... then use the rest right out of the box. Mike Koerner Haha! That is some funny stuff! Quote Link to comment Share on other sites More sharing options...
GrassStripFlyBoy Posted October 3, 2020 Author Report Share Posted October 3, 2020 Lots of ways to set plug gap... Keep in mind the saying if you drop a plug once, be sure to drop it twice. The second time being in the trash. Quote Link to comment Share on other sites More sharing options...
gogogo888 Posted October 5, 2020 Report Share Posted October 5, 2020 https://www.ebay.com/itm/Engine-Spark-Plug-Gap-Tool-Gapper-Gapping-12mm/173435375870?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649 This $30 gap tool seems to be pretty good. And remember to torque it at 20NM. Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted October 5, 2020 Report Share Posted October 5, 2020 4 hours ago, gogogo888 said: And remember to torque it at 20NM. Plus don't forget to use the correct silicone heat paste on the threads of the spark plug. I remember from school that they said if you use regular anti seize that you stand a good chance of pulling the threads out of the cylinder head. I suspect they were talking about the Champion ant seize. Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted October 5, 2020 Report Share Posted October 5, 2020 Regular anti seize is old school tradition. Hard to get some people to advance with the times. All anti seize ever did was help stop thread galling and fight off any corrosion. The silicone based thermal paste we use not only does that, but it's big claim to fame is it transfers about 40F - 50F from the plugs to the head. This helps stave off preignition that regular anti seize can't do. Our paste is used in the electronics industry to to transfer heat. I have switched several certified aircraft pilots away from the anti seize. Quote Link to comment Share on other sites More sharing options...
gogogo888 Posted October 6, 2020 Report Share Posted October 6, 2020 https://www.aircraftspruce.com/catalog/cspages/silheatsink.php I've been using this $16 silicone based thermal paste with no problems. Anyone else use this one? Quote Link to comment Share on other sites More sharing options...
Roger Lee Posted October 6, 2020 Report Share Posted October 6, 2020 https://www.amazon.com/MG-Chemicals-860-150G-Silicone-Transfer/dp/B005DNQWQU/ref=sxts_sxwds-bia-wc-p13n1_0?cv_ct_cx=mg+chemicals+860-150g&dchild=1&keywords=mg+chemicals+860-150g&pd_rd_i=B005DNQWQU&pd_rd_r=21e07829-1e1e-44ef-b347-1129a870b629&pd_rd_w=QyRM3&pd_rd_wg=uVpoU&pf_rd_p=224b59c9-c98f-46fd-96d6-8e952866d6a3&pf_rd_r=K7TYKD9YG8PZH7RG9BP9&psc=1&qid=1602008874&sr=1-1-a14f3e51-9e3d-4cb5-bc68-d89d95c82244 Quote Link to comment Share on other sites More sharing options...
GrassStripFlyBoy Posted October 6, 2020 Author Report Share Posted October 6, 2020 I've bought that one from Spruce, but I just used up what's left in the "single serve" small package from LEAF. That seamed a bit thicker consistency, but maybe that was from having it opened for a while. Quote Link to comment Share on other sites More sharing options...
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