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Sprockets to beat a 2007 Honda 400ex

jerod400ex

By jerod400ex
in Honda ATV Forum

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jerod400ex Community Regular

jerod400ex

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i am changin my sprockets i want to add more torque but not lose very much top speed wat size should i use...... i would like to change the sprockets so i can beat my buddys 07 400ex with hmf slip on and rejetted..... we top out and then he slowly creeps past me:skeptic:..... wat size i need to stop this prob????

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jerod400ex Community Regular

jerod400ex

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A 13t on the front of a 99-04 significantly reduces top speed.

Sent from my SGH-T959V using Tapatalk

i dont want tht to happen..... if i was to do a 16t in the front and keep a 38t in the back and then buy a dyno jet kit would tht raise top speed significantly and the jet kit would restore lots of torque??

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marioweldinginc Veteran

marioweldinginc

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would the dynojet kit help at all its suppose to add 15 to 25% horsepower..... i want to still have a pretty decent bottom end

You should switch to a.free flowing exhaust (any slip on really) a free flowing intake or air filter

For stage two you need to open your airbox either by removing the lid or using an ehs kit

Then the dynojet kit will make hp. Without mods the jet kit wont do.much cept make your.wallet lighter

Sent from my SGH-T959V using Tapatalk

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jerod400ex Community Regular

jerod400ex

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I have a dynojet stage 2, whitebros slipon, k&n filter and EHS airbox lid and i prolly freed about 6 max rear wheel horsepower

Remember a company makes hp claims using perfect parameters not on the trails

Sent from my SGH-T959V using Tapatalk

ya i see wat ya mean.....and im talkin drags so i need to find a good combination so he wont just loose me off the start and in the end i will pull on past him

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jerod400ex Community Regular

jerod400ex

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You should switch to a.free flowing exhaust (any slip on really) a free flowing intake or air filter

For stage two you need to open your airbox either by removing the lid or using an ehs kit

Then the dynojet kit will make hp. Without mods the jet kit wont do.much cept make your.wallet lighter

Sent from my SGH-T959V using Tapatalk

one tht blows out more air u mean than the white bros....... i was thinkin of buyin k&n air filter with an outerwear pre filter and then just cuttin the air box off and put in the jet kit

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jerod400ex Community Regular

jerod400ex

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You might just want to take the spark arrestor out but you would have to add more fuel. You might lean out the mixture too much and burn up your valves

Sent from my SGH-T959V using Tapatalk

ha i dont want to be fixin things i want to improve lol..... ohh by the way i should mention the ex hasnt been rejetted since i put the white bros on

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marioweldinginc Veteran

marioweldinginc

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I would get as much of your add ons as possible then rejet. This way you dont have to rejet for every part you replace. But dont drive around hard without rejetting. The more air you flow the more fuel your going to need. Without the rejet you could do some damage to your atv. Also you can step up to a hotter sparkplug

Sent from my SGH-T959V using Tapatalk

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jerod400ex Community Regular

jerod400ex

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I would get as much of your add ons as possible then rejet. This way you dont have to rejet for every part you replace. But dont drive around hard without rejetting. The more air you flow the more fuel your going to need. Without the rejet you could do some damage to your atv. Also you can step up to a hotter sparkplug

Sent from my SGH-T959V using Tapatalk

wats a hotter spark plug gonna do??

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rappy97 Rising Star

rappy97

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which is the reason for the rejet

After all my mods I did, I also used a NGK D9 plug. Its tan in color so I must be doing something right :)

Did you learn that the tanish color on a plug is good from your Hanna Montana fan club? "you get the best of both worlds, lean or rich, no right in between"

Edited by rappy97
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quadnut20 Grand Master

quadnut20

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I would get as much of your add ons as possible then rejet. This way you dont have to rejet for every part you replace. But dont drive around hard without rejetting. The more air you flow the more fuel your going to need. Without the rejet you could do some damage to your atv. Also you can step up to a hotter sparkplug

Sent from my SGH-T959V using Tapatalk

Why would he want to run a hotter plug ?

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