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Rossi Tuning- How To?

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Old 05-04-2007, 02:10 PM
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stnick
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Default Rossi Tuning- How To?

I bought a Patriot ARF on RCU a few weeks ago with a supposedly low time ready to fly Rossi 45. ( please don't say I told you so...) I took it to the field yesterday and gassed her up with 15% and she fired right up and idled beautifully. I ran it up and down for a about 15 seconds and then leaned over to adjust the high end. That's when I noticed no matter how much I turned the mixture screw, it made no difference. I actually took the screw out while idleing and fuel simply came out. Anyway, one guy said he had the same problem and it was a rusty rear bearing... This is my first rossi so I wnet into it and the bearing looked great, as did the crank, rod and piston. I took the carb off and dismantled it and found a small piece of silicone in the barrell. I reassembled and took off for the maiden. The engine seemed fine until I raised the gear and she died immediately. i'm sure that was just coincidence since no fuel lines are near the nose gear, but I had to dead stick on the maiden and I greased it in. My concern is how do you tune the high end? Is it not like and OS or a Saito? It just doens't make too much difference and when it does make a difference it takes a lot of turns.
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Old 05-04-2007, 02:58 PM
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Default RE: Rossi Tuning- How To?

I will assume for a moment you did the usual check for crap in the carb, kinked or leaking fuel lines, missing carb base o-ring ... stuff like that. Also, that you have a new glow plug in the engine (preferably a hot one)

What exhaust system is being used ? A pipe or one of the Rossi mufflers?

What prop are you using....?

Just for referece, the Rossi 45 needs to run on nothing much bigger than a 10x6 prop (either exhaust system)

If you are running a pipe, remember the pipe determines the rpm the engine will run at. If the pipe is too short, or the prop is too big for the pipe length, it can be nearly impossible to set the top end needle.

Double check the fuel system. I know on my old ARF Patriot the tank install was horrible - it foamed the fuel very easily. A little work with a dremel, a new tank, and some foam rubber packing eliminated the problem. Fuel foam is air in the fuel... and this too will make it nearly impossible to set the mixture properly.

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Old 05-04-2007, 05:03 PM
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Default RE: Rossi Tuning- How To?

Check the front bearing, the seal goes out and sucks air, and,,,, TA-DA, cant set top end. Rossi seems to bee bad about this. To check this you can do a couple of things, put you finger over the carb intake, does it still run? Or if you have a fuel bulb, while the engine is running, put a small stream of fuel at the prop hub / case joint and see what the engine does. If its sucking air it will suck in the fuel too, and should flood and die. BE CAREFUL OF THE TURNING PROP AND YOUR FINGERS!!!!
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Old 05-05-2007, 02:50 AM
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Default RE: Rossi Tuning- How To?

Switch to 5% or 0% fuel. 15% is way to much. You will never be able to tune it until you lower the nitro!!!
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