one or two is somewhat normal, but a large number normally means youve an air leak, that will also indicate why your blowing plugs, as the engine is running more lean because of the added air in the mixture
never heard of that before..
low speed is about pick up off the line, so you can only do that by trial and error, you'll know if you get it wrong, as it will hesitate or bog
if you cant put paragraphs then its probably in HTML so you'll need to use code like < br > blah blah < br/ > (without spaces) which will create line breaks.
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at idle the engine should keep a consistent RPM if the engine is meshed or not. if your driving and the engine shifts, then it will over rev if your still accelerating as theres no resistance.
as for engine bolts they are just m3 cap heads and about 12-15mm long. dont get rc specific ones as you'll pay like
you ideally need a fast and torquey servo. allowing the brakes once set correctly to bite fast and strong. also have a look at fitting answer rc brake springs. they sit on the rods between the 2 pads putting constant pressure against the pads keeping them open, so the brakes dont drag, and stops them glazing
could also be too rich on the bottom.
having said that not all engine idle till the tank is empty. my Rb is only good for about 10 seconds before it needs a blip of throttle or it will die
I look how far the servo has to travel to do its job, then set the EPA at that point, then back it off 5%. some servos are always buzzing or make noise, savox's for one.