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04-06-2011, 08:34 PM
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My Ride: 02 400ex
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426 and 440 Riders
im wanting to go a 426 bore just cause i feel the need for more HP. i want more compression than 11:1 but i also dont wanna run race fuel. Is this possible? if so can 1 run 12:5.1 on premium? if any of you are running this set up with a high comp piston please help.
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02 400EX, Weisco 11:1, Stage 1 HC, FMF Powerbomb Header, Motoworks SR4 Race Series Slip On, DynoJet, K&N, Crankcase Breather.
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04-07-2011, 12:47 AM
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My Ride: 1991 TRX 250X
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First Name: Married with Children
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To gain optimum performance from a high CR piston atleast 100 octane up to 107 is recommended. I run 100 Low lead aviation fuel simply because it's cleaner than pump fuel and less expensive than race fuel
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I Am Moose!
1991 TRX 250X 12:1 Wiseco .060 over,uni filter Stage 1 Cam. 400EX carb the rest is a secret!!
www.extremeoffroad.us
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04-07-2011, 01:46 AM
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Junior Member
My Ride: 02 400ex
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so are you saying to run that fuel with 12:5.1 and higher?
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02 400EX, Weisco 11:1, Stage 1 HC, FMF Powerbomb Header, Motoworks SR4 Race Series Slip On, DynoJet, K&N, Crankcase Breather.
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04-07-2011, 01:53 AM
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My Ride: 2001 trx400ex
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this website helped me alot try it out HONDA 400EX TIPS | News | ATV Action
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04-07-2011, 04:01 AM
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Junior Member
My Ride: 02 400ex
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My ATV: 02 400ex
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i just need to know at what compression i have to start running race gas and stop running premium
thanks
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02 400EX, Weisco 11:1, Stage 1 HC, FMF Powerbomb Header, Motoworks SR4 Race Series Slip On, DynoJet, K&N, Crankcase Breather.
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