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Old Oct 09, 2014, 08:44 PM
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United States, CA, Santa Barbara
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fuel and motor question

Hello,
I have a nitrobike comeing, and wanted to know what fuel/oil % to run.
motor is the Picco ORANGE HEAD EVO .12 I have access to VP 20% on sale for $20 gallon , or Byrons 20% 25%? the rtr blend with 16%oil aswell. what is the factory needle setting on this motor?
Thanks
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Old Oct 10, 2014, 11:55 AM
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Espa˝a, CL, ┴vila
Joined Sep 2008
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If you plan to run your .12 engine with 20% nitro fuel you'll need more than factory carb settings.

Most .12 engines had head clearance factory set to run 16% nitro fuel. This should be something close to 0.40/0.45mm. For 20% fuel, increase that clearance to 0.50mm adding/changing head gasket.

Wrong head clearance will lead to blown glow plugs and erratic function.

I've checked Picco official page looking for factory cab settings and they don't provide more info than this...

http://teampicco.com/index.php/tech-...-carb-settings

Hope this helps.

Cesar, from Spain.
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Old Oct 10, 2014, 01:19 PM
DLAWW
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I used the Byron's Race fuel 30% nitro. good reading here.

http://www.rctech.net/forum/nitro-of...ns-please.html
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Old Oct 10, 2014, 08:19 PM
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Quote:
Originally Posted by DLAWW View Post
I used the Byron's Race fuel 30% nitro. good reading here.

http://www.rctech.net/forum/nitro-of...ns-please.html
great info thanks, Im just getting back into nitro bikes after 3 years, do you have to shim up the head for 30%? If that's the case ill go with Byrons 20% most likely 25%.
Thanks DLAWW
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Last edited by brcer; Oct 10, 2014 at 09:10 PM.
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Old Oct 10, 2014, 08:31 PM
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This is the only
info I could find on the picco
Picco .12 - .15 (General Carburetor Settings: slide and rotary)
New Carb -
4.5 turns out on the high speed needle
2 turns out on the low speed needle. (adjust while carb is wide open)

I think I will just ask Dave, motor should already be factory set, but I know you cant allways trust the factory..
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Last edited by brcer; Oct 10, 2014 at 08:49 PM.
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Old Oct 11, 2014, 11:33 AM
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Wetherby, UK
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I always use Byrons race fuel 16%
Cesar is correct, any more nitro should require another head shim or 2 to get compression down. If not, expect blown plugs and possible engine damage from detonation.
That motor will be plenty powerful enough on 16%, enough to win the WC in the right bike.

Some more useful info here

http://www.rctech.net/forum/onroad-n...al-tuning.html
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Old Oct 11, 2014, 03:09 PM
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I just left it stock from factory like Dave said to. It fired up first time with 20% nitro. It is set rich from factory, still breaking in my motor.
I'm using the byrons fuel btw

http://vid1372.photobucket.com/album...ps4720c3f9.mp4
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Old Oct 11, 2014, 05:40 PM
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Quote:
Originally Posted by rollin3z View Post
I just left it stock from factory like Dave said to. It fired up first time with 20% nitro. It is set rich from factory, still breaking in my motor.
I'm using the byrons fuel btw

http://vid1372.photobucket.com/album...ps4720c3f9.mp4
nice man, I like the paint job to.
hope to see some more videos..
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Old Oct 11, 2014, 07:44 PM
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Originally Posted by brcer View Post
nice man, I like the paint job to.
hope to see some more videos..
I wish dude, all it does is rain here....A word of advice, dont run without the rider and find a place thats really smooth and not much uneven pavement or ruts...my bike went airborn and landed on the pipe..there goes 70.00 bux and a long wait for the replacement
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Old Oct 11, 2014, 08:13 PM
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Quote:
Originally Posted by rollin3z View Post
I wish dude, all it does is rain here....A word of advice, dont run without the rider and find a place thats really smooth and not much uneven pavement or ruts...my bike went airborn and landed on the pipe..there goes 70.00 bux and a long wait for the replacement
Advice taken, sorry about your pipe.
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Old Oct 12, 2014, 08:46 AM
DLAWW
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Yeah thats a race bike not a basher.
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Old Oct 12, 2014, 05:27 PM
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I have a nice place to run out in Goleta, I run my 1/5 onroad their.
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Last edited by brcer; Oct 12, 2014 at 05:43 PM.
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Old Oct 12, 2014, 11:00 PM
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Quote:
Originally Posted by nuovaic View Post
I always use Byrons race fuel 16%
Cesar is correct, any more nitro should require another head shim or 2 to get compression down. If not, expect blown plugs and possible engine damage from detonation.
That motor will be plenty powerful enough on 16%, enough to win the WC in the right bike.

Some more useful info here

http://www.rctech.net/forum/onroad-n...al-tuning.html
just to be clear, the Byrons 20% with 16% oil is the rtr blend, their other 20% blend has 12% oil correct?
Thanks
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Old Oct 13, 2014, 01:19 AM
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Correct. For racing 12% oil is ok. 16% oil is not needed for bikes (we don't stress them as much as cars) and can cause more problems with excess oil running back down the pipe into the head producing an engine lock.
I was referring to 16% nitro.
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