which pipe

[tec548]

I have a YS90 long stroke, which pipe do you find provides the best power with this engine?

Joel

[q8hobbytime]

ok if you want to save some $$$ get the MP5 running head speed of 1800 to 1850 max, but if you want to run higher head speed get the new Hatori SB-19 TB Sp.
you will love this beast, simply the best

[tec548]

Thanks for the response. I will have the Hatori then...

Joel

[xlpro]

mp5 no good
mp2 good!

[bmoranx]

IMHO.... With no doubt in my mind, the SB-19 pipe works the best with the YS91 SR... I have seen them all so far, MP5, MP2 and the SB19 absolutely gives this engine the most torque. If you like to bury the collective with loads of pitch, this is your pipe.

[Awamori]

I'm running the OS 91 pumped on a "MP5" with a governed 1950 headspeed. It's running like a skinned cat....hope it lasts. Only three gallons so far. Can only speak for things I have tried and flown myself.