[bobholder]

I have a 1997 Polaris Ultra (680 triple). I starts fine, but when riding it misses. The miss sounds electrical. It cuts out for 1/100 of a second at a time. The miss doesn't affect performance when riding slow. You'd never notice it except for the sound. But when hitting the throttle hard you can feel the miss as well as hear it. The sled still hits 75 mph with throttle left but cuts out intermittently all the way.
Plugs look fine. Any suggestions? The first thing I want to do is replace plug wires. Do I have to replace the whole coil? Is there something else I should be looking at? The miss seems like more than just one cylinder, like the whole ignition system is missing. Is there a main unit that controls the spark?
Any help is appreciated.

 

[dano]

Even if a plug looks good, change it. As for the wires, it comes as one big peice, the wires and the "ditributor". i would do both first and if no go, then start asking reapair shops or dealers. My rmk did this, i replaced the plugs and all is good.

dano

 

[FRNTFLP]

If your sure the plugs are good, then you might be looking at CDI box. The bummer is that the CDI is expensive and can't be returned if you install it and it wasn't the problem. Your sled should have a digital ignition on it and the "whole world" is controlled by the CDI box.

You mentioned that it seams to happen to the whole motor, not just one plug. Makes me wonder if all connections from where the wires exit the motor on up to the CDI are making good connections. Worth a check. Spray them down with a contact cleaner like CRC.

Another idea just came to mind. There are a set of four switches that work as shut offs for the motor. The ignition switch, kill switch and two in the throttle block. The latter two are designed to kill the motor if the throttle sticks. It's not uncommon for them to go bad, in the process, cause intermittent problems.

If you look between the brake disc and the starter, you will see one black wire with a white connector. It's close to the main big plastic connector for the motor electrical. Pull apart the small single wire connector and take it for a ride. If the problem goes away, you know it's in the various shut off switches. If not, it's definately an ignition problem. i.e. plugs, CDI, etc.

One thing to remember, with that small black wire disconnected, the only way to shut off the engine is to pull the choke and flood it out. All electrical shut offs have been disabled.

It's a quick way to point you in the right direction. Good Luck !

 

[y2k700xc]

I am having the exact same problem on my 2000 xc700 del. Cold and low speeds runs good as it warms up after a few minutes it misses and has no top end I have put it back to stock no change cleaned the carbs no change, checked fuel pump output all ok Thinking electrical as you are Some one help US ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[y2k700xc]

That black wire frntflp was talking about was all corroded fixed it and adjusted oil pump(was set too rich) runs great I figure with the corrosion(green death) it was causing resistance in the off curcuit and causing miss(corrosion as it warms up causes more resistance and this wire should have no resistance--open ) Thanks Frank

 

[Administrator]

That black wire frntflp was talking about was all corroded fixed it and adjusted oil pump(was set too rich) runs great I figure with the corrosion(green death) it was causing resistance in the off curcuit and causing miss(corrosion as it warms up causes more resistance and this wire should have no resistance--open ) Thanks Frank

Great to hear that you have it all fixed up now.