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Old 07-06-2008, 06:30 PM   #1
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Default 30% down to 20%

my cuz wants to know if u can go down in % nitroo his stock hpi rs4
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Old 07-06-2008, 07:02 PM   #2
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depends on the thickness of headshim's....does he have .20mm or .30mm or ?
he could always use 25% which will work in motors usuing 20% or30%
Werk's and Byrons both make 25%...i have used both and have had no problem's with either....i like them both and i'm currently usuing Byron's..
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Old 07-06-2008, 08:35 PM   #3
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Yes he can. Might want to go with a hotter plug if it doesn't want to idle well but I doubt he will notice much of a change. He could probably pull out a head shim but if you are not sure what I am talking about don't worry, just switch the fuel and re-tune and have fun.
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Old 07-06-2008, 10:46 PM   #4
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he has the rs4 running on 33% traxxas and his jato running on 20% traxxas i think 25% fuel is not sold in my lhs only 20% and 30%
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Old 07-07-2008, 07:54 AM   #5
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To be right you would need to take a head shim out and run a hotter plug in the motor.
I run 15% nitro and now run just 0.1mm head shim and a No:5 plug.

Re-tune the carb and away you go.
15% nitro, 18% oil and at $11 a gallon. I like it. Especially if you really don't need the utmost of power. I run this in my off-road car and for bashing around.

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