Cdi box ????? - Yamaha Grizzly Forum : GrizzlyOwners.Com Yamaha Grizzly Forums


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Old 06-30-2008, 09:31 PM   #1 (permalink)
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Default Cdi box ?????

Question for the experts. What does the CDI box do? I took the stock CDI off of a 07 Grizzly 450 and put it on my 08 660 and there was no difference between the two. I ran both on a long straight run and the top end was the same on both. I then took the stage 2 CDI (AMR Racing) off of the 450 put it on the 660 and the only difference was the reverse rev limiter was increased. Any info?
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Old 07-01-2008, 07:55 AM   #2 (permalink)
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I'm no electrician, but I'd have to try and explain it as the brains of the firing system. It throws the right amount of spark at the right time to keep the fires lit. Being an electronic beast, there's all sorts of programming that can be done with it. You can add a rev limiter, a spark advance, a limiter for when you're in reverse or low-range...
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Old 07-01-2008, 10:37 AM   #3 (permalink)
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I understand all of that. I just dont understand how the 450 cdi box will not cause any change in the 660
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Old 07-01-2008, 11:36 AM   #4 (permalink)
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Basically, all for your grizzlies are the exact same bike! Except for the motor and overall bike size. All of the electrionic's are the same. In simple terms, a pickup coil senses crank position,it tells the cdi box to fire the coil,the coil fires and now you have a spark at the plug.So the CDI box (the little computer) doesn't care what bike it is on. It just knows if this switch is made i do this,If this one is made i turn this off. Some of it, as with the ignition has timers built in, as in fire the coil after a (quessing) 20 millisecond delay. That is what the aftermarket boxes play with. Let's say a stock box fires 8 degrees before top dead center and fires the coil for 10 milliseconds, a aftermarket coil may fire 10 degrees before top dead center and fire the coil for 15 millisecond. Therefore the spark plug fires sooner for alonger time hense,Hopefully making you just alittle more power. I hope my ramblings help .
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Old 07-01-2008, 01:59 PM   #5 (permalink)
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Shick, Thanks for the info. Yes that does help. That is kinda what I was thinking, that the cdi boxes are pretty much the same (stock). I probably shouldn't have been fooling around, switching boxes but curiosity got the best of me. I am just trying to get the best performance out of the 660 without getting into the internal parts of the motor. Any advice on a cdi box that actually works to improve performance on the 660? Also, has anyone tried the billet roller wieghts and if so do they make a difference?
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Old 07-01-2008, 02:47 PM   #6 (permalink)
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jj4450,
Shick is right about the aftermarket CDI boxes chang'in things up to make more power. I put a Hauck Power Sport on mine & I was surprised at what I gained ... HOWEVER ... that is NOT why I bought mine. I bought the Hauck CDI becasue it eliminated the reverse limiter AND the Diff lock limiter. I had already over rode the reverse limiter, but with tracks & wanted the Diff lock over ride thing.

I understand Dynatek CDI boxes also give some good performace gains & they too have the limter overrides built in.

They aren't cheap ... betwix $160 to $220. So you have decide how much you wanta spend.

I personally haven't seen the billet roller weights ... but I have changed weights in my clutch. (Along with the secondary spring & I added a machined sheave to the primary).
Changing the rollers (depending on weight) will make a difference ... one way or the other. (It can help or it can hurt performance)
One just has to buy a few rollers of different weights & try them.

Later ...
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Old 07-01-2008, 03:11 PM   #7 (permalink)
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I put a Heinen's CDI unit in mine, and have been VERY happy with the results. By the time I got done with tires, clutching, and carburetion, I was down a couple of MPH on the top end. When I put in the new unit, it gained me enough top-end tht I am now hitting 64.5 mph. My bike originally topped out at 61.
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