Quantcast
Jump to content

  • Join Today, It's Simple and FREE!

    As a member, you can post in our forums, upload your photos and videos, use and contribute to our downloads, create your own member page, add your ATV events, and even start your own ATV club to host your own club forum and gallery.  Registration is fast and you can even login with social network accounts to sync your profiles and content.

jerod400ex

Sprockets to beat a 2007 Honda 400ex

Recommended Posts

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????

Share this post


Link to post
Share on other sites


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??

Share this post


Link to post
Share on other sites
If you go 16/38 you would have all the top.speed you need. In fact you wouldnt have a good bottom end at all.

Sent from my SGH-T959V using Tapatalk

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

Share this post


Link to post
Share on other sites


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

Share this post


Link to post
Share on other sites
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

Share this post


Link to post
Share on other sites
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

Share this post


Link to post
Share on other sites
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

Share this post


Link to post
Share on other sites


I have a wb and its not restrictive at all. But any slipon will flow more air than stock

Sent from my SGH-T959V using Tapatalk

ya i have a white bros on right now

:yes:

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites
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

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites
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??

Share this post


Link to post
Share on other sites


Light off better with the mods you do.

an NGK DPR8Z is from the factory

Step up to a DPR9Z

Sent from my SGH-T959V using Tapatalk

Edited by marioweldinginc

Share this post


Link to post
Share on other sites

No. Your lean already, which will eventually put a hole on your piston, but a hotter plug will make it worse.

Share this post


Link to post
Share on other sites


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

Share this post


Link to post
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Similar Topics

    • By Gary Patch
      Hi my linhai 300 is hard to start and  engages gears at idle which is 1200 rpm was looking at cdi says on it 7500 rpm does this mean quad should idle at 7500 rpm as this would explain transmission problemb as idle is too high thanks gary
    • By Finsdad
      Im new to the forum and the quad I just got. I want to change oil in in. Its almost impossible to find anything on-line. I know it takes 10w40 and know the oil filter location. What oil should I use? Is there a cross reference for oil filter. The closest dealer to me is an hour away. I have NAPA close and like the WIX or Napa gold filters. Also is where can I get a Manuel for it? Thanks
    • By Wali
      I was riding my 400ex one day and when i shut it off to put it in the garage i tried to start it put again to drive it into the garge and it wouldnt start.I put a compression tester on it and its like 30 psi with out throttle and 0 psi WITH THROTTLE.
      when i put my finger over the hole it fell likes its pulling my finger in more then its pushing it out 
       
      Has good spark.When i took it into the shop the said it had 1oz of oil in it and a tiny pit of metal shaving(TINY BIT LIKE 30 flakes)
      When i try to pull start (push start/roll start) it made a not normal sound  and wouldnt stay running.
      If my bottom end is blow why would it still turn over fine,
      Are my valves siezed or not working properly 
      or is my timing off causeing valves to not open in correct order with fire 
      PLEASE HELP all help is appreciated 
    • By w_r_e
      Can anyone point me to a good set of instructions for changing front diff oil on a 1987 Suzuki LT4WD? I can almost guess which bolts are drain & fill... but I've been wrong before... 😆 
      I found some partial posts on other forums and they linked out to dead images and whatnot. Any help appreciated. 
      This thing is running pretty good, got the front brakes back to life, electric start works fine, seat cover fixed up, plastics stitched back together...
      BEFORE (last week):

      AFTER (today):

    • By Belmontie
      Hi bought this quad with a few leaks and other issues which thanks to excellent advice from these forums I thought I’d sorted them till I washed it down and found oil underneath. 
      It is coming from the seal around the gear changer pedal as it looks like someone has banged the housing flat on one side. Knowing how easily aluminium is broken I don’t wanna risk tapping it back into shape. Would a new seal fit or would the distortion of the housing render it useless.
      thanks in advance 
  • Similar Tagged Content

    • By mikeexplorer
      Wiring diagram for 2007 Arctic Cat 700 EFI 4x4
       
       
    • By sloundez
      Does anyone out there know where I can get a functional pair of wheel cylinders for subject ATV? Any suggestions welcomed. Thanks
    • By Npeters
      Im working on a old 1987 honda 125 4 wheeler in the school shop. It will start by getting pulled by another 4 wheeler but wont start with the pull start or Electric Start. When you pull start it it tries to start but when you try the electric start it just turns over but doesnt even act like it wants to start. The spark plug is dry and it shoots fuel out of the back(air filter side) of the carb. Weve had the carb off twice and it is complety clean. What are some things we can try?
    • By marcuslachance
      I
      I bought a Honda 250sx 1986 but the exhaust is broken. Apparently it's not possible to order a new one. I checked to order one on others compagny but there's noting.
      Do you know which exhaust it's possible to install. Is there a company who sold an exaust to fit on my 250sx.
      Sorry for my english
      Thank you
      Marc
    • By JenWal85
      Hope someone can help with this one.
      We took our 1984 Honda TRX 200 to the shop and they had it for about 2 weeks before they finally called and said that they had cleaned the carb and changed the battery and that it had started up.
      We went and got it and when we got home it would not start so we called them, they said bring it back in, so we did. They called us the next day and said they changed the spark plug, and that it was running. We went and got it again and it ran when we drove it off the truck.
      We parked it for about an hour because we were going to get ready to go on a ride. Well, it wouldnt start again.
      So we called them and they said the last thing they could do was order a new CDI box and put that on. I decided to just buy it myself, so I didnt have to pay them labor again. We put the new one on today and its still not starting.
      Does anyone have any ideas on what we could check to see what in the world is going on with this thing?
      Please and Thank you
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...