Unfortunately, many bear the misconception that SH engines run very hot and thus wear out faster. The truth is that these are incredibly powerful and reliable engines. In fact, they are currently the largest exposures of RC on road, off road and competition engines in Asia, displacing the previously popular Toki and Team Infinity branded engines. However, to the inexperienced hobbyist, they may experience overheating problems with their SH engine. This is because the factory needle settings may be incorrect. Apparently, the default needle settings for the SH .21 and .28 engines are 4.75 turns out for HSN and 3 turns out for LSN - both from a fully closed position. My SH engine arrived with a very lean LSN setting. Consequently, I experienced problems starting the engine, as well as difficulty getting the engine to idle. If I did not adjust the trim or hold the throttle, the engine would shut off. I did a check on the exhaust and found that the fumes were grey or transparent and did not splutter unburnt fuel. The engine also hit temps of over 270 f. I proceeded to richen LSN in gradual increments and I hit the right tune after richening about .45 turn. I just finished my 5th tank and temperature does not exceed 225 f, like any other big brand engine described in RC car engine break in instructions found online. If you own a SH engine that is running hot, do try the tips I described in this post. If you have a question or feedback on SH engines, do leave me a comment on this post. Cheers!
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