Quote:
Originally Posted by biggie862005
how do you know when the piston is at BDC? how do i make it stop there??
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take the exhaust off and look through the port and look to see when its at the bottom of its stroke, when it is mark the flywheel with a marker so you dont have to keep taking the exhaust off. if it doesnt stop there when your shut it off just turn the flywheel until its there, its fine if you turn it by hand there acctually is still oil in the engine from the fuel after you run it, thats why you need to use afterrun oil, so it doesnt rust.
the benifit is it maintains the pinch in the engine, thats what makes compression, if you leave the piston at the top it stretches the sleeve causing it to loose it pinch much faster.
he says under 40 because that usually when you start seeing problems. also its when the plastic starts to become more brittle, and its much easier to break stuff.
your best investment will be a temp gun, just keep an eye on your temps, break in is the most important time to keep track of your temps.