which cdi box for the 400ex

[berm ripper]

i have had motor work done . now i need some feed back on some cdi boxes. big gun, white bros, gt thunder. also which has the most rpms. thanks

[nakomis0]

Just about all of them are the same cdi box, just different stickers on them.

Gt Thunders are one of the few exceptions.. they give you the extra rpms, and a slight timing advance .. and it will start as easy as it does now.

All the re badged cdis are hard to start, because u need the motor to spin fast before it will spark.. gt thunder I dont think has that problem.

Or if you want the very best ther Dyna FS is probably it but it cost $300

[bradley300]

they are hard to start partially because they are all re-boxed xr250 cdi's. gthunder is the only exception, it was built by laz for the 400ex, not another re-boxed honda part

[Nathan400ex]

i have a White bros , it works fine if i keep the battery charged

[BSTURDIVANT]

Magnum and Big Gun both sart easily at any temp. stay away from
factory Honda XR250r boxes.
Basicly 2boxes (all are built everseas)
Sparks WB etc. (factory Honda repackaged)

[Pappy]

GT Thunder is the only one ive had expierence with and it doesnt affect the starting. WB units are pos

[lukester720]

I had the white bros on my 400ex and it was a POS, if the quad sat for a few days or if the battery was drained just a hair the quad wouldn't start without a jumpstart.:mad:

I have in my possesion a couple of prototype cdi's for the 450r and the one doen't start very good either. It wants to backfire when you kick it over a lot more often, I think they have the timing a little to advanced on that one. The other box kinda cut out in mid to high RPM. If they get either one of these boxes squared away they should be impressive from what I could tell with my testing.

[cals400ex]

i have had great luck with the gt thunder box. the sparks was hard to start. the gt thunder definately made the throttle response more crisp too. i guess that is because it advances the timing along with raising the rev limit.

[fast4Exr]

i run a magnum box and it helps a little. no problem with starting it at all

[bpimpdaddy21]

where would I be able to purchase one of these GT Thunder Rev Boxes??

[cals400ex]

Originally posted by bpimpdaddy21
where would I be able to purchase one of these GT Thunder Rev Boxes??


send this feller a pm. he can hook you up.

Jeff@QuadShop

[TRXRacer1]

http://www.geocities.com/gtthunder.geo/gt1.html

[torqen2k1]

How much and were is the best place to buy the GT Thunder CDI

[lukester720]

www.gtthunder.com

[torqen2k1]

Originally posted by lukester720
www.gtthunder.com

I been on their sit and I see its not on their sit. your link is showing me a adjustibale cam gear not a CDI.

[lukester720]

I realize its not on the site but posted it so you could pull the phone # and give them a call.;)

[torqen2k1]

How much do the GT Thunder boxes run for. I definitly purchasing it.

[TRXRacer1]

:huh We both gave you the web site so YOU could call them. Just call them and find out.

[torqen2k1]

OK thanks. i will be giving them a call asap.