Dave, I just purchased a new 140DZ and I am a little concerned about the light weight clunk the engine comes with. I read somewhere that you have to use this clunk or the engine will tend to dead stick. It sure seems like it may be too light and not want to stay down in the fuel. THe instructions also say a bladder tank is recommended. I have never used or even seen a bladder tank and how it works. Do you use a clunk with the bladder tank also? WOuld you recommend the bladder tank ( Tetra ) or will the clunk that comes with the engine work ok?

I have only run the engine so far on the bench with a standard clunk but I have the YS clunk installed in the plane but I have not had a chance to fly the engine yet. ( Snowing for 2 weeks now) THis engine sure runs good so far. Boy what a power house! I sure hope it runs as good in the plane as it does on the bench.

Thanks for your help.

Use the clunk that came with it. When it soaks up with fuel, it will be heavy enough. The only rub when using this clunk is that it won't empty the tank completely, leaving about 1/2" of fuel when it won't suck anymore. If you go with a Tettra tank, no clunk is needed.

Dave, thank you for your help!

No problem.

Good Flying!