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Old 08-06-2004, 07:29 AM   #1
Exe
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Unhappy Please help me with rossi engine!!!

Hello,

well.. i bough 12 ROssi blax pixy outlaw 5 port , but i can get
how to tune ir properly...

when i look at the pictures of the carbs in tech tips, i cannot
understand which needle is which...

ok, here it goes, i have high speed needle, then as i understand
mid-range needle which is located next to the balck needle which physically closes or opens carb - low speed needle if i'm correct,
and on the other side of the carb, i have another needle which is in the middle of the ring, to which i connect throttle linkage. what is this needle ? can someone tell me what are the factory settings for all these needles and how to tune this engine properly?

thanks.
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Old 08-06-2004, 07:33 AM   #2
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Only use the "main needle". This is the one that extends vertically. If you are just cashing than that is all you should touch.


Cheers,

john
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Old 08-06-2004, 07:34 AM   #3
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I meant "bashing" hahaha
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Old 08-06-2004, 07:35 AM   #4
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Go buy the book "Ultimate Nitro Engine Tuning Guide". Its will explain everything you ever need to know about nitro.


John
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Old 08-06-2004, 07:36 AM   #5
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Here is a link
http://www.rcstore.com/rs/general/de...1014&catego=BO
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Old 08-06-2004, 07:46 AM   #6
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it will take me a few weeks, until i get it, cause i'm in europe. can someone please explain me brieflly on my question...
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Old 08-06-2004, 08:08 AM   #7
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There is no simple answer. Look to see if it is avaialable in europe. It should be.


John
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Old 08-06-2004, 09:15 AM   #8
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The brass screw is the middle needle and should be flush with the carb body. You should not need to adjust this

The low end needle is the one on the carb slide. Open this 4 1/2 turns

The high end needle is the one that sticks up. Open this 5 1/2 turns.

That is a good starting point with this engine. I had one for 1 year. It is still fast as hell!!

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Old 08-06-2004, 12:49 PM   #9
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Default Re: Please help me with rossi engine!!!

Quote:
Originally posted by Exe
Hello,

well.. i bough 12 ROssi blax pixy outlaw 5 port , but i can get
how to tune ir properly...

when i look at the pictures of the carbs in tech tips, i cannot
understand which needle is which...

ok, here it goes, i have high speed needle, then as i understand
mid-range needle which is located next to the balck needle which physically closes or opens carb - low speed needle if i'm correct,
and on the other side of the carb, i have another needle which is in the middle of the ring, to which i connect throttle linkage. what is this needle ? can someone tell me what are the factory settings for all these needles and how to tune this engine properly?

thanks.
Taken from Trinity's web site, importers for Rossi engines:

All carburetors are factory set on a flow bench. For this reason it is recommended that you count the number of turns on the low and high end needles before you use the engine. All carbs are not the same, but are set to flow the same amount of air and fuel. Up to a one half turn difference can be had on factory carburetor settings on each needle. A two micron difference in the needle taper can make the setting up to 1/2 turn different from another carb. It is also not recommended not to adjust the mid-range needle setting on your Picco, Sirio or Rossi until you are completely comfortable with carburetor adjustment.
How big is a micron? There are 25,400 microns in one inch. This dot (.) is approximately 1/64 of an inch wide and equals 615 microns. It doesn't take much to off set a needle setting.

Rossi Engines (General Carb Settings)
Low End: 4-3/4 turns out
High End:3 turns out
Midrange: Flush with carb body

Looking your carb from the top:

What is the "Top End" needle?
The "Top End" needle is the large needle valve on top of the carb that adjusts how much fuel is delivered to the engine from half throttle to full throttle.

What is the "Bottom End or Low end" needle?
This needle is to your right, at the end to which you attach your throttle linkage, and adjusts how much fuel the motor gets at idle and at the first crack of the throttle.

What is the "Mid Range needle"?
As its name says it, it adjusts how much fuel you get between high and low speed, but as they say this is factory set and shouldn't be taouched unless it has allready been messed up. It is located to your left under the high speed needle.

What is the "Idle needle" '
As its name says it, it adjusts engine idle, and is located near the engine crankcase.

Hope this helps

AFM
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