just got my first YS engine, a 120. I am installing it into a TF p47 1/7 scale. I have some questions that are perplexing me. First; according to the instructions when starting the engine I need to "remove tube B from the filter remove tube A from the check valve, then fill the tank. Pour several drops of fuel into the carburetor." This tells me that I may have a big problem starting the engine with the cowl on. Do I have any options?

Second: when hooking up the fuel lines I wanted to do three lines into my tank but the instructions are using only two With Ts off the lines for a filler line and a vent line. Does the vent line go to the muffler? Or does it just hang out the bottom? And the filler line, can I just bypass the T and run a third line into tank for fueling?

I am really lost on this one so any help would be appreciated.


Thanks in advance

The YS uses a sealed system. There are no "loose lines" from the tank. The best plumbing you can use is T fittings/fuel dots installed between the tank and the fuel filter on the incoming side and between the tank and the check valve on the pressure side. You only need 2 lines to operate this engine, one for the pressure one for incoming fuel. Uncap them both and fill through the fuel line. Use the pressure line for the overflow.

DO NOT use a fueling valve as they are prone to leaks.

You need not prime the engine through the carb. Simply open the throttle to full and hit it with a starter for 5 to 10 seconds. This will pressure up the tank and give the engine enough to fire. Reduce the throttle to a few clicks above idle, connect the starting battery and light it up. Allow it to run for 30 seconds at fast idle then set the needles.

Go to the instructions at www.ysperformance.com and follow them for your setup.

Good Luck!

Dave

Thanks for the help. So from what I understand I cannot use the three lines into tank I just need two. And I will fill and empty tank by way of a T into the fuel line between filter and tank and will create a vent by T-ing into the pressure line between check valve and tank. The vent to be sealed with a fuel dot unless I am filling or emptying tank. Seems pretty simple.

Thanks again

You got it! Let me know if you have any questions or problems.

Good Flying!