19x14, wow.....what %nitro and pipe are you running. What are you turning the 17x13 at?

Brian


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Have used both the standard Hatori #900 originally offered for the OS140, and the new ES carbon type for the Webra 160. They both work fine with the edge to the ES pipe on quietness front. Much larger pipe than the Hatori. The problem with the ES pipe is its length: it will not fit in my model at the long setting required so I am relegated to Hatori duty only.

Fuel is run of the mill CP 10% with 2 extra ounces of castor oil added for margin. This is fine fuel for all two stroke work.

I used higher nitro too (my old mix was 30% heli and 10% CP mixed 50:50, plus 2 ounces of castor) but was getting some pre-ignition rattle that I could hear and found undesireable. Turned out to be unnecessary to run the high octane stuff

17x13 full blade will turn at over 8500 if I let it. It's almost scary power and makes my 9 3/4 #Temptress go ballistic. And BTW I am running the TN Promix II carb, not the MC that came with the engine. Far simpler set-up and not as critical as it was on the 145. Hope that helps

MattK