Predator 90 lost spark

[ABM-Cannibal]

I am fixing a Predator 90 for a friend. He told me he left it at some families house and the kids beat it and it quite running. He took it to a mechanic and it sat there for about a year. I brought it home and hooked up the battery to my truck with the motor off and cranked it. It cranks great, it is getting gas but no spark. I have a sportsman 90 so I took a few parts off and put it on the Pred and still no spark. Does anybody have a suggestion on what I can replace to try and get some spark. If I can get it to start I know I can clean everything back up and get it running right again.

[dblacks]

Did you look at the stator?

[ABM-Cannibal]

No I haven't.

[markvette]

90% of the time when you loose spark on an asian mini it is the stator expecially if the quad has been rode through water.

Mark

[ABM-Cannibal]

I will pull the stator off of my sportsman and put it on the Pred and see if that fixes it. If it does, I will have my friend order the Ricky Stator off of E-Bay. Thanks so much.

[ABM-Cannibal]

Do you need a puller to take off the flywheel?

[markvette]

yes there is a special puller, about $15 but i have heard of people just tapping the flywheel a little with a hammer and it will pop right off. i have never done it this way but some have said it works.

Mark

[markvette]

Tests to try if you have no spark or if your charging system is bad.

Preliminary test >>> This will not work on the Polaris and may not work on the Viper. If You Have either Proceed to the Stator test listed below.

1. Locate the CDI and unplug the connector for the black wire with the white stripe (or white wire with black stripe).
Test for spark. If no spark, leave it unpluged and proceed with test.

2. On the CDI, unplug the red wire with white stripe (could also be white wire with red stripe) AND the Black wire with white stripe (could be white wire with black stripe).

3. Locate the wires that come from the stator on the engine (right front top of engine. This harness is about 10" long can covered with a black tubing).
Connect the CDI red wire with white stripe (could also be white wire with red stripe) directly to the matching stator wire. Connect the CDI Black wire with white stripe (could be white wire with black stripe) directly to the stator wire.

Test for spark.

If no spark, you have a problem with the CDI, Stator or COIL. You have eliminated the AVT wire harness as the cause.


The stator tests as follows:

1. YOU MUST USE A DIGITAL OHM METER!!!
2. On the stator the ohm reading between the red wire with white stripe (could also be white wire with red stripe) AND the Black wire with white stripe (could be white wire with black stripe) should be about 1284 ohms for the ETON style (3 bolt fan) stators and 689 ohms for the Kasea, LRX and DRR (4 bolt fan) stators.
3. The red wire with white stripe (could also be white wire with red stripe) to ground should be about 447 ohms for the ETON style (3 bolt fan) stators and 112.7 ohms for the Kasea, LRX and DRR (4 bolt fan) stators.
4. The Black wire with white stripe (could be white wire with black stripe) to ground should be about 837 ohms for the ETON style (3 bolt fan) stators and 576 ohms for the Kasea, LRX and DRR (4 bolt fan) stators.
5. From the plastic connector with the three wires, confirm that the black lead has 0 resistance between the lead and the frame of the atv. That is the ground lead. Any noted resistance in the ground system means the ground is BAD. We recommend always adding a wire between the engine and the frame for a better ground.

NOTE That the total ohms for #3 and #4 are the same as the ohms in #2. That is because we but the resistance of the two coils in series and added the ohms.

IF YOU DO NOT GET THESE READINGS your stator is BAD.

COILS:

1. There are two resistances in coils. Eton vs. Kasea.
2. The Eton should measure about 9.24k ohms checking between the high voltage lead (no boot) and the coil ground.
3. The Eton coil should also read about .5 ohms between the coil input and coil ground. Kasea reads about .3 ohms. Don't switch them because you can burn out your CDI and stator.

Your typical plug cap is a resistor cap and it should read about 5k ohms. A great replacement cap is the NGK TB05EMA.

If your stator, coil and engine kill wiring tests OK, you simply need a new CDI. I will not list out CDI test procedures since you have concluded your CDI is bad and because if you test the CDI improperly, you will damage the unit.


If you want to check the charging feature of the stator:

(We assume that you have confirmed that the in-line fuse near the battery is good and that your battery is in good shape.)
1. Locate the 3 wire plastic plug from the stator. One wire is the black ground and the other two are the charging system.
2. The Orange wire with red stripe to ground should read about .4 ~ .5 ohms on the Eton and the same on the Kasea style.
3. The White wire to ground should read about .5 ohms on the Eton and .3 ~.5 on the Kasea style.

NOTE: You cannot interchange the Eton for the Kasea stator without the matching flywheel and there are two crank tapers that you will find. The Kasea style has a substantially higher voltage output for lighting.

For those who prefer pictures Spike has spent several hours putting together very detailed graphics for your use. Click the links for some excellent detailed pictures.
try these (http://community.webshots.com/photo/262582347/1318273032052910875cfSfjO)

another (http://community.webshots.com/photo/262582347/1284461583052910875taUohN)

another (http://community.webshots.com/photo/262582347/1284444555052910875dgMNXk)

one more (http://community.webshots.com/photo/262582347/1284444182052910875nXeEcj)

http://thumb15.webshots.net/t/26/26/4/45/55/284444555dgMNXk_th.jpg (http://rides.webshots.com/photo/1284444555052910875dgMNXk)]one more[/URL]

[etondaddy]

Thanks sounds like some info that my come in handy someday. But I can't get the links to come up. Hell I printed it and I'm going to hang it in the trailer.

Thanks again
Mike Kozura

[kenjolly]

I have a pred 50 and 90 and had the same problem. try draining the gas from carb first, i did all the stuff your talking about and nothing. when you ground the plug mine didnt show spark either but some one here told me it wouldnt for some reason.

drain the gas from carb and try it again. my 90 does it everytime it sit's.

[markvette]

new links should work

[WOLFPACK]

Originally posted by ABM-Cannibal
Do you need a puller to take off the flywheel? Same puller that is used on a 250R and alot of hondas.

Check the key switch as well. I've run into a few that will turn over but because of a faulty key switch wouldn't spark.

Shane