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.

Recommended Posts

I'm looking at a rev box right now for the 400, but I'm not sure if this is the way to go. Is extending the RPM range like this bad on my engine? Does anyone else on here have any experience with them? Thanks :D

Share this post


Link to post
Share on other sites


i think i would look into an aftermarket cdi instead of just a rev box.. there are some like dyna tek that modify timing and other things to increase hp as well as offering different higher rev options...

Share this post


Link to post
Share on other sites

An aftermarket CDI will replace your factory unit, I believe the rev box is a piggyback item that just overrides the stock rev limiter and timing curve.

Share this post


Link to post
Share on other sites

The Big Gun Rev Box is a CDI?!?!??! You really won't see to much of a gain with just the CDI upgrade. A more aggressive cam with the CDI... Now you're talking!

Share this post


Link to post
Share on other sites


The exhaust tip is a great way to go if you can't afford a new pipe. You could always remove your airbox lid and jet the carb accordingly. That will give you a noticeble gain. You could always get some front shocks off of a 450 and upgrade your front suspendion.

Share this post


Link to post
Share on other sites
The Big Gun Rev Box is a CDI?!?!??! You really won't see to much of a gain with just the CDI upgrade. A more aggressive cam with the CDI... Now you're talking!

This is true, the biggest advantage of a rev box or aftermarket CDI, is that it lifts the rev limiter, unless you are riding up against the limiter all the time, it won't make much of an improvement, aside from higher top speed unless you compliment it with other mods to take advantage of the more aggressive timing curve. Like Bot said, open up the intake and re-jet, a new high flow intake is not too expensive either. A set of cams is a good upgrade too, they would really help you get the most out of the other little stuff, but they are a little more expensive.

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 David Miller
      Does anyone know how to access the check engine codes on a 2018 450 sportsman. Just changed battery and spark plug . It runs fine but the light is on and I need this to plow snow and need it reliable. Any ideas . Thanks
    • By Juan Gutierrez
      hello all. i have a suzuki lt230e engine. hopefully i can get it to drive some wheels soon.
    • By zont
      Hi, I have just purchased a 2002 Yamaha Kodiak 400 I think, the vin has worn off and I have located an engine number I think it is J312E-004674, could anyone tell me where the engine number might be please
    • By weblex
      Problem: The ATV starts and runs at idle perfectly. But as soon as I open the throttle, the engine starts to slow down until it stops. On the attached video you can hear the sound of how it works: see video below
      Prehistory: there is a Polaris Sportsman 500 1998, which for about 1.5 years stood in repair, including also replacing CDI with one taken from the same ATV. Finally, the vehicles were on wheels, traveled several kilometers and overheated - forgot to fill the antifreeze Came back home in small moves. The next trip started well, but after 10 km there was a feeling of a small drop in power (even as the vehicle got warm completely) but still drives. Next trip - the situation is repeated. The next test of ATV through time and a huge loss of power from the very beginning. The engine sneezes, does not want to go more than 5 mph.

      What has been done: the carburetor has been replaced with a new one (inexpensive, $ 40), a new spark plug, a new ignition coil, the engine head has been removed, the piston is in good condition, valves were corrected - but the problem was definitely not in them.

      Ignition control unit is suspected. Who faced similar? Please help in solving the problem.
      Thanks in advance.
       
       
    • By bradleyheathhays
      This may sound like a stupid question, as I'm prone to ask sometimes. But...I drive a '96 Cherokee with the inline 4.0 non-interference engine and it doesn't like driving in the heat so much. Since I'm a car down right now I'm driving it a LOT more than I used to. After a lot of driving in this hot weather it starts slower, but still starts and runs ok.

      So to help it out I've been raising the hood and putting 2 box fans right on top of the engine to help it cool. I hadn't thought about it but my Mom asked if cooling it down too quickly could be bad for the engine. And since I don't know I thought I'd ask here.

      Any harm in using my method to cool an engine down much more quickly than normal?
  • Similar Tagged Content

    • Guest Fox300exchic
      By Guest Fox300exchic
      The Hop-Up: You may be saying to yourself, “that’s a chick bike,” and you’re right. But honestly, it’s so much more than that. It’s one badass bike. http://www.quadmagazine.com/quad/features/article/0,24942,1587044,00.html
    • By Ajmboy
      Ok, starting a new thread because there is a lot of new stuff out there. Thinking of getting a new soft ATV bag instead of the quadboss rear lounger trunk I have now. I used to have a soft bag on my king quad, but that was a while ago.
      Now I've got my grizzly and the box on the rear rack, which is nice.
      Please post if you are using a bag or box, what kind, and what you like about it. Thanks.
    • By katasha2
      I took apart the carburator to clean out and I can't remember exactly where the springs that are inside the float are supposed to go I've tried to look up schematics but I think I am missing a spring maybe need helpt:confused::confused:
    • By skgw1
      Feul pump went out. Replaced. At times quad cuts out like its not getting gas. Saw article on new pump needs to be calibrated. Told how to go into a service mode. Does not tell how to calibrate after going into mode. Can anyone shed light on this procedure.
    • By Bwdeaton
      I recently picked up a king quad 700 that doesn't run in the hopes of getting it running by spring. It had been previously taken apart some and a few pieces are missing in the engine, but the frame is complete and in good condition. The motor will need a piston, rings, cylinder, cams, and a few misc parts that are missing. Also the cases will need to be split to remove the pieces of piston that are in the crankcase. The piston blew up at high rpm and did a number on the cylinder so I'm trying to find out if it would be worth rebuilding this motor it buying another engine to swap in. There may be more damage to this engine that I can see so I was wondering how bad the insides of it could be considering it destroyed the piston. I have found a motor for 1200 plus 200 shipping, the only problem is I don't have that much now and I would have to save up a while before being able to afford it. Any suggestions appreciated.
  • Recently Browsing   0 members

    No registered users viewing this page.


×
×
  • Create New...