[Killin_Bambi90]

I have a 06 kfx 400 and recently the quad starts cutting out and will stall if I fully press the throttle. Any time I try to rev it up it cracks and stalls like the jetting is crazy off. Carb is clean, reverse sensor is good, and everything else has checked ok. I have a big gun cdi I there and bought this quad used. So far, $700 of repair, and only 12 rides in the past 4 months.... Like I said, once the bike gets warmed up I feel like the box is failing.

I have read that some of my symptoms are similar to a bad cdi and the guys where I work are guessing the same. I tried to get the bike to act up in front of the mechanics when it started but of course it worked great. I work at Action Powersports in Litchfield. A Polaris, Suzuki, and Kawasaki dealership

 

[Doug"E"Fresh]

Just borrow a stock Cdi and try it. That will give you the answer

 

[ltz4-rum]

The dealership doesn't have a used (or new) CDI you can put in to try? This is the only way to varify if it's bad. If not, I have a CDI off an '06 I'll sell you.

 

[Oh Four Z]

I also have a cdi for sale 05-08

 

[ctnstabber]

A big gun is the same as a Pro Com they have problems
Note very reliable

 

[Doug"E"Fresh]

I have had had my big gun in my bike with no problems. It's a piece of electric they will all fail at some point.

 

[biggiej42]

I have had had my big gun in my bike with no problems. It's a piece of electric they will all fail at some point.

I went through two procoms in less than a year, they sent me a brand new one, sold it to another member, and it failed after the first ride. Now the other member is using my dyna that I had on for two years, and i'm using a dyna programmable, no problems on either end.

 

[711streetfighter]

Yep procom stinks, just like biggie I had the same issue with them but got one more ride out of it then he did (2 total) before it did what yours is doing, after a little while it just quit all together. Dyna are just as reliable as stock cdi's which means very good. Plus they stand behind their products and have a huge following with a proven racing track record.
Anyways check the basics,
clean air filter
good spark plug and lead
spark plug drain hole not clogged
petcock flowing enough fuel
clean and properly adjust the carb / fresh gas.
if it's hard to start, check the valve adjustment also
Check those things before spending money on a new cdi, if it comes down to it buy a used stocker or dyna from here on the forum or ebay before you get another procom/big gun/yoshimura (the early yosh boxes were not rebranded procoms later ones are but I'm not sure what year they switched) cdi.

 

[sandman74]

You won't find a Yosh box for an 05&up that's Mitsubishi, they're all procom.

 

[Killin_Bambi90]

From what I was hearing they are un reliable. Thanks for all of the replies guys. May go with the dyna since I am looking to upgrade valves in the fall

 

[bobltz]

ltz 400 runs good cold but spits and backfires when it warms up is this the cdi going

hey i have 06 z 400 i just purchased it. it runs good for the first 30 min then it starts spittin and backfire i let it sit for a while it runs good then statrs acting up again so i have to let it sit the fan comes on so it not hot the carb is clean and jetted right could thi be my cdi going out please help oh it has a new battery it it but barely turns the engine

 

[Isaiah_10]

I am having similar problems^^^

 

[bmxgod1999]

Hey guys I just fixed the issue runs, ideals good but back fires when giving gas and acts like it's hitting rev limiter, turns out my ignition coil was bad or going bad... Found one used but oem on marketplace back to riding STRONG 💪