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Discussion Starter · #1 ·
I `ve been thinking about the Big Gun cdi but ive been trolling..kinda cheating on y`all..around other forums and i got caught up in one where these guys were bashing the crap outta them. Anyone have or had one? Any other suggestions on revs would be greatly app. Thanx guys
 

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What I think is funny is that most of those bashing conversations go something like this..."RevBoxs suck, they are a POS blah blah blah. I only use Dynatek, they are better"

Dynatek makes about 90% of the CDI boxes on the market. Other companies just slap their sticker on it.

There is nothing wrong with Big Gun.
 

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I run big gun on my 400 and i race it, does great!
 

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Discussion Starter · #4 ·
Cool..thanx for the input..i find it hard to believe that there would be so many of them out there if they sucked but i hate to spend cash on things without the facts! Anything i should do with it or is it as they claim..Plug and roll?
 

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I have one on my Z400, and I haven't noticed any promising gains in RPM. My trail tech computer is hooked up to my motors RPMs and it didn't even go up the full 1000 RPMs, only about half. It also didn't help at all with the reverse rev limiter. But, it might be different for the EX.
 

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The CDI is plug and play. The z400 already revs higher than the EX, there for the rev box won't increase a full 1000rpms. Different machines get different gains. They advance the timing which is the main function of replacing the box.
 

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You don't have to change cams, but to see/feel the full potential of a CDI Box's gains you should change cams. Most, if not on all ATV motors the HP output drops the last couple hundred rpm. When you change the cam along with the exhaust and intake you are increasing your HP output so you can effectively use the extra 1000rpms. If you add an extra 1000 rpm's to a stock motor, you will actually lose speed and power at the top of your rev limit. But the advanced timing which leads to better throttle response is more noticeable than your loss of top speed and power.(This is at the very top of your rev limiter, you don't notice any power loss. You will only see it on a dyno machine)
 

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Discussion Starter · #9 ·
So its worth the cash...i just think 1st and 2nd are real short..i do alot of trail and woods riding and it seems that in 2nd the RPM`s are too high and in 3rd i have no throttle response/lack of power..just looking to help that out and i was told that the Big Gun would really change all that...true or false?
 

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The CDI is not going to be a "oh my god, what a difference" kind of change but your quad will be a bit snappier and have a bit better throttle response. It won't change how your quad runs in each gear. That is all done by sprockets.

You can always go down 1 size on the front sprocket. You will gain more torque/acceleration by doing that.
 

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Discussion Starter · #11 ·
Cool..so the combination of both along with the K&N i have and the pipe I`m getting will make the changes I`m shootin for?
 

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I think they will get you going where you want to be...
 

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Discussion Starter · #13 ·
So i just ordered a renthal 14 tooth..my budget is kinda low..single dad.. what do you recomend as far as a HP gaining slip on or is it not worth it and should i just save and wait longer and get the whole pipe? Doese the header help that much?
 

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The canister portion of the pipe makes about 25% of the power and the header is about 75%. If you got like an FMF or something you could always buy the header later on down the road.

A slip-on with the air box lid removed and jetted correctly will be a nice power gain.
 

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Discussion Starter · #15 ·
OK..now i do alot of trail and woods riding like i said before..so removing the airbox lid is scary to me..how about drilling some large holes..or do i just put on a outerware and not sweat it? I avoid water and mud like the plague but still..sometimes ya cant avoid it.ALSO..i posted in brakes and suspension about my lock nut being stuck..i tried spraying it for days..then MAP gas..still nothing..notta budge in either direction..anything? The worse part is that my rotar is loose..so i gotta do something quick..qanna go away over the holiday..Thanx for all the help so far too man!
 

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You can run an outerwear lid or like on mine, I cut half of it out and then drilled holes in the other half.
 

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I've never had any problems with a stuck lock nut... I don't know
 

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Discussion Starter · #18 ·
Its really stuck man...i`m afraid i might have to cut it off..good old Die grinder..dont wanna do that though..i dont have the proper wrench and i`m wondering if using a pipe wrench might be squishing the nut and binding it up against the threads..but i gotta have some leverage so i`m stumped..yeah..if i drill some holes do i have to jet right away or will the extra airflow help regardless?
 

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The extra airflow is going to put you lean if you don't rejet. Lean is bad. What ever pipe you choose, that company should be able to tel you what jets will put you in the correct area.
 

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i dont have the proper wrench and i`m wondering if using a pipe wrench might be squishing the nut and binding it up against the threads
I don't know if that's what's happening in your situation, but a pipe wrench can squeeze the nut and bind it.
 
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