the 2 you mention use good motors. which is a plus to start out wiht.
they have a low and high needle, and an idle adjust screw.
they are usually tuned to start, but tend to be a bit on the rich side.
tuning is pretty simple. the process is almost identical to nitro, but does have its differances, which are key.
1 is the needles flow opposite than a nitro. on a nitro motor, in most cases, gas flows into the carb thru the H needle, and you adjust the low needle to take what it needs from the flow thru the high, for low rpms and idle. on a gasser, the fuel comes into the carb and goes to the low needle first, then once the motor is around 1/3rd of throtle, the high needle then starts to flow as well, but not from the low, but via a 2nd path in the carb. this way one is not dependant on the other like a nitro is
2. the needles are much more sensitive to adjustments. on a nitro, sometimes it seems you have to give the screws large turns to see a differance in performance, where on a gasser, a small adjustment can be immediatly noticed. so when tuning, you want to tweek the needles by very small margins. 1/32nds to 1/18ths adjustments is what i recommend using when turning the screws. lil tweek, quick run to check out, lil tweek and quick run to check out. once i have it where i think im starting to lose performance from being to lean, i reset to where its good, then give it just a small (1/32) tweek rich. i prefer to stay a bit on the rich side for tuning personally.
4 once the needles are set, you can pretty much not worry about them. thats not to say a lil tweek here n there isnt called for and needed, but they are no where near as finicky as a nitro motor is.
as temps change, your motor will benefit from a tweek here and there.
5 same as nitro, maintenance is key.
clean airfilter system, properly oiled with greased ends to seal to the housings. outerwares airfilter bag is a must, even for onroad. good fuel and quality 2 stroke oil for fuel and lubrication, but much cheaper. abound $4 to mix a gallon of gas with 2stroke oil, compared to 35ish for nitro fuel
other than that, they are much more reliable motor wise. keep it clean breathing, and don't let things get loose bolts (carb manifold cylinder, plug, and exaust) can all become loose from time to time letting in, not oly air which leans out the fuel ratio, but could alllow dirt or other crap to get in causing failure.
