Originally Posted by bobconnie
If ya been useing Elthanol/gasoline you have a bigger problem! 2 strokes don't like this stuff you will need to clean the carb well maybe even need to boil and rebild ! and don't ever use the alky gas again !! we have stations down here that advertize for non alky gasoline, cus we have so many 2 strokes down here!!m just sayin don't use the stuff !!
Guess that's sort of a geography-specific solution, though. No non-ethanol available around here...
k25824: If the rest of that doesn't work, and if you're using E10 ethanol, a couple other things to check. Ethanol will eventually separate (aka phase separation) the alchohol from the gas from any water
in there, so you might also sometimes see low RPMs (your symptom) when burning water/gas, or even extreme unexpected RPMs -- if the engine will burn any of the alchohol layer at all. Also, the E10 formulation will attract more water
, so if you leave the vent open overnight (for example), you may find your ethanol degrades more quickly. Recommendations include using a fuel stabiliser every time (see Practical Sailor for brand tests and choices) and also use the fuel more quickly, don't store it over 6 months (per magazines, but I find 30 days sometimes problematic).
In more extreme cases, you can check whether the ethanol has "cleaned" the inside of your fuel lines, or even the tank (I'm guessing that's probably an internal tank your model has?). If it has scoured or degraded the inside of the lines or the tank/fittings, etc., you may need to do a bit extra work to clean the carb (e.g., with compressed air through a needle valve) and/or replace some of those fuel lines.