fuzzybabybunny Posted June 25, 2016 Share Posted June 25, 2016 (edited) Unfortunately I don't have any prior experience with two-stroke motors and I'm a little bit confused on how they work, especially about the procedure where you clear air out of the fuel lines. It's a ROS 125 motor with membrane / Walbro carburetor (I'm not sure how the latter works, but it appears to pump fuel into its fuel chamber and then the engine's combustion chamber via the flex of two trampoline-like rubber-ish membranes and a network of one-way valves). Leanness / Richness can be adjusted through two screws that terminate into needle valves? So... if I see air in the line, I'm supposed to put my finger into this hole/depression on the side of the carburetor, squeeze the primer fuel bulb until... sometime..., tip the engine over on its side to drain excess fuel into the air filter, and then there is a hole at the bottom of the air filter box that drains the fuel out onto the ground? - Ok, ok, what does putting my finger into the hole/depression do? - correct me if I'm wrong. I'm supposed to: Prime the engine by squeezing the bulb... once? That sprays fuel directly into the combustion chamber of the engine. I make sure the compression release is engaged I yank the starter cable which spins the flywheel, compresses the fuel and air from the priming step, and sets off the spark plug. Is the point of this step to get the engine turning above a certain RPM? Hopefully the engine then starts running on its own. I warm up the engine and set it to full throttle at least one time while on the ground to make sure bubbles are out of the fuel line Edited June 25, 2016 by fuzzybabybunny Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted June 25, 2016 Share Posted June 25, 2016 All the above . You'll find your own routine for starting , one thing not mentioned check your throttles not stuck open for what ever reason. Might be safer to put it on your back if your gonna try and hold full throttle . Perhaps Cas . Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted June 26, 2016 Share Posted June 26, 2016 Just read your post again . Re the hole / depression , when pressed lighty squeeze the primer bulb if you have transparent fuel pipe you'll see the fuel and any air bubbles on its way to your carb , squeeze the bulb till there gone ' you'll prolly have fuel dripping out by now . That's it your ready to start . If your fuel tube is black stuff ' one more squeeze on the primer bulb after you see fuel dripping. Try it . cas . Quote Link to comment Share on other sites More sharing options...
fuzzybabybunny Posted June 26, 2016 Author Share Posted June 26, 2016 Why do I have to put my finger into the depression and squeeze the bulb to get rid of the fuel line bubbles? What does that depression do, versus not putting my finger in there and just squeezing the bulb by itself? Quote Link to comment Share on other sites More sharing options...
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