Quote:
Originally Posted by steelie600
also as some have mentioned the rubber in enginges. Some of the high end engines have a silicone insert in the crank and the wd40 will ruin it. Personally i just crank the motor without the ignitor to flood it a bit so the lube in my fuel coats every thing, but then again my engine is used most weekends
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Not a great idea either.... Nitromethane (Nitro) which is in the fuel, is the chemical thats attacks the metal within our engines. The main purpose of after run oil to coat the metal parts, so that the nitromethane does not... flooding the engine with fuel adds more nitromethane to the engine.
Personally i prefer to remove the plug (having cleaned the plug area before removal) and drop 5-7 droplets of after run oil down the plug hole, then turn the engine over by hand (by rotating the flywheel) 4-5 times, with the car lifted from the rear at 45 degrees, to allow the oil to run into the bearings. For a buggy engine, removing the carb air filter to add oil can (and most probably will) introduce dirt down the carb, resulting in more damage done than the good of oiling.
After running an engine, and having been left for a few hours or so, the menthol and nitro will run to the bottom of the engine, leaving the carb fuel free and not really in need of oil.
Others will have their own ideas on this, but the most important thing is to use the correct oil and not to get dirt into the engine.
If racing week in week out... no harm in just not doing it and no risk in doing it wrong.